Excellent video! I checked your webpage and found your lower power versions of this inverter. They were just what I was looking for, small, simple and easy to make. Thanks for sharing your ideas with us. Keep up the good work!
haha you have to be an electronics teacher, my old electronics teacher had the same sense of humour as you, he plugged a lead into a plug and said to a kid if he holds onto the wires he will be plugged into the national grid and the kid was gonna do it lol he was like are you crazy, go sit in the corner XD but yeah also your accent sounds like your from yorkshire :D
Hi HARRY!!!, well Can't tell you how glad I am too see you putting your knowledge where we can see it in action, Thanks and please keep um coming,, I may never get it at this late date, math pretty crummy" but I will keep trying for at least a little luck, If you get a chance, ck out "gotoluc" he too inspire's those like myself
Hi HARRY!!!, well after having gone thru 3 yrs of youtube tutorials, 5 computors from junk via dial-upisp's, I'm still as dumb @ age 55 as I was @ 13. I 1st saw you @ your site a few years ago and was addicted to electronics since,,haven't had much success though. Will the TO-220's work? Tried this with them and they fried,,could be my circuit, I was using a multi-vib similar too this and it aint working to well. I also took apart a M.O.T. and rewound it to creat the center tapp trans for 2nd
@tvolala1976 It's called 'magnetostriction' it is coming from the transformer. As the domains inside the transformer core swing from north to south they slightly change shape causing the metal laminations to knock together.
So. I'm guessing I can use this same circuit with a rectifier to make any kind of dc/dc voltage conversion I want? Using different transformers of course.
why not just convert your lights to led in your house and install a rectifying diode and run your house on dc much cheaper then using ac stick it to edison all you can
The lamps were only a demonstrable load. 230V AC is often used to power other items.
Unfortunately a LED TV takes as much current as an old "fat" TV - it costs 4x more:
LED TV - SEK10 000
Fat TV - SEK 2000
My inverter - SEK100
An LED computer has not yet been invented, nor has the LED central heating pump.
But to cut out the comedy, LED lamps themselves are somewhat cold and not at all pleasant to use. As regards ecconomy, the "low energy" lamps are comparable. HL
You should be very carefull with these voltage. It is easy to stuff 24V into the wrong winding of a 24V/12V transformer. As a matter of interest, you should ALWAYS have some form of load on the output, otherwise you can get minute spikes of up to 3000V. But they go as soon as you apply a light load.
I had thought about klqanking a 100nf cap across the output but I thought that would complicate the project unnecesarily. HL
If you have a torroidal transformer then the efficiency can be as high as 80% on load, but this drops as the load falls. A 200W inverter may be 80% efficient at 200W but only 10% at 10 Watts. HL
Free energy has been here for a while ,But Millions are spend in supressing that information,Get a motor that needs no gas or electric input at LT-MAGNET-MOTORdotCOM ,Join the revolution!
Watch the vide and listen. You choose the transformer to suit the battery voltage: ie. use 12-0-12v transformer with a 12v battery, or use a 24-0-24v transformer with a 24v battery.
I showed a 12v transformer, but then here I have a 24v transformer.
Thank you i was trying to do that from very long time.But when I made th multivibreator it can't light even a bulb of ten wats i made it with two resistors of 6018 oms was that right.Pleas help.And sory if i have misspellings i am from bulgaria and i don't know eanglish perfect.
harry!!!! you are still the MAN!!! my system is still runnig great thanks you...my wife loves the money she gets to spend shopping! Now that i can save some money on my light bill, the reason for this is that you said somrthing at your homebrew page that set it off and BOOM it WORKED for me!!! HARRY IF I EVER GET RICH AND NEED YOUR HELP!!! I WILL CALL ON YOU BUDDY!!!! thank you chuck!!!!!
thanks smovpo i did 1 but my battery to fast to low batt im using 12v 7.4 ah not reach 1 hours you have idea to make longer to use this battery thanks................
Thanks Sm0vpo, you are great the is the circuit I was searching for since long time to use near my Marina deck. Please post more useful project. I will try to make this circuit very soon.
You seem to be a knowledgeable guy. Just wondering if you could tell me if this would work.. I have a 60 amp AC power supply. Puts out about 14 to 17 volts. Is there a way to turn it into a power converter ? What I would like to do is set up a windmill generator and use it to charge the batterys.
@sm0vpo@sm0vpo Sir my name is rohit and iam from india.i have started an inverter project based on seeing your great video! i have indeed collected all the parts for the project,but i have a question? what is output ampere rating of the 12-0-12 transformer that is shown in your video.in india we use appliances with a rating of 220-230 volts with 50 Hz?
hi, thank you for this nice and instructive video i wanther how you calculate the transformer winding and wire gauge use else how can i upgrade this inverter to 5000w
The whole point is to use ready-made transformers. But if you use big transistors with heatsinks and a 500W transformer then you will have 500W. You can make two of them and parallel the outputs. The two will sync to each other. No reason why you cannot usw 3, or 4, all in parallel providing the inverters and transformers are IDENTICAL..
How would I do this if I wanted to use your idea but instead of using a 12 0 12 transformer to make 220 volts I want to make 120 volts. How would I do that? What transformer would I use to say make 300 watt AC output?
you are a great man! thanks for the info, it worked great for me, ,my wife laughed at me when i was putting it together,but stopped when she saw it working and recharging itself, so far it's been two weeks and still running. Thank you harry!!!
Assuming you are pulling 100W in a 12v system then the 12v side has a current of 10 Amperes. With a 100A/h battery you would get 10 hours non-stop use, minus any inefficiency. In practice you could expect 7 hours solid, if the battery is charged.
hi. can you help me ? i want to do a electric car .i use a electric motor 3.5hp altern current. what can i do to drive this motor with batteries .sorry be me english i dont speak well. thanks bye
Most effective way would be using AC motor(s) and frequency controller. The inverter build would be quite the same seen here using transistors with different parameters.
For example, if the motor has carbon brushes connecting to an armature with loads of brass segments, then you connect the field and armature windings in series and apply LOW VOLTAGE dc - eg 24v.
"inverting" = "converting". All generators only convert one form of energy to another.
All "generators" have some input power, whether it be a head of water (kinetic energy), diesel fuel, or in my case, the energy stored in your car battery.
If you want free energy then connect the DC/AC converter to your neighbours car battery :-)
Make several IDENTICAL inverters and put the outputs in parallel. They will automatically synchronise with each other. At least, my two 200-Watt inverters did
I saw a film with the Perendev motor, but I believe that they are not real. In the film I saw it looked quite well made, but there was a shadow of a guy with an electric drill behind the thing.
I do not believe in perpetuial motion, otherwise I would have used my DC/AC inverter to run a battery charger to charge the battery that powers it ;-)
I agree totally. But if the lights have just gone out then my solution will put them back on again.
I used 24V to halve the current problem.
Commercial solar/wind power use 48vDC systems for the same reasons. High V = low current.
Large computer UPS (bigger than 300W) use battery voltages from 24v to 120v. I have stripped down a defective UPS having 20x 5A/H lead-acid batteries in it.
Also, the higher the batteru voltage the higher the efficiency.
Apply electrodes to the human body, using a conductive agent to improve the contact (as in medical electronics), it is possible to get the skin resistance down to about 5000 Ohms.
It only takes 50v (peak) to deliver that 10mA though a 5000 Ohm resistor. Thats why the internationally recognised lethal voltage is 50vDC (35vAC).
10mA and 5000 Ohms series resistor makes the human body into a voltmeter.
No. I am powering a telly, a computer, and even my oil-fired boiler with them. The circulation pump has to have a better sinewave, but eccomony lamps, flourescent lamps and sinple tungsten lamps all work perfectly. I was reluctant to try a computer myself because I thought that SMPSUs needed a good sine, but not so. Modern PSUs just rectify the input then chop the DC and stuff it through a HF pulse transformer. They don't care about the input form. Synchronus motors are the beasties that hate sq
Put a small load on it and the volts will fall to 115v. There can miniscule spikes higher than 115v and you are using a digital multimeter (peak reading) at a guess :-) BR Harry
I had a load of fun makinh the film. At the time Maj-Lis (my wife) was upstais calling me to come and settle down for a cosy evening. The hardest part was trying to keep a straighr face, or it would not seem so funny :-)
Depends on the transformer. As a rule the oscillator bursts into HF osc when the is about 50% of the rating of the transformer. A 250 Watt txfmr will give you over 100 Watts. A small 16" colour telly is only about 65 to 85 Watts.
I have just built one using a 500W 115-230v autotranformer and rewound the coils for 20v-0-20v + 115v + 230v and I am pulling 280 Watts out of it. Running a computer, monitor and a 135W TV set beside it. Havta switch them on 1 at a time, though - TV first. BR Harry
Yes, that is exactly what it is. Here in Sweden, a "power Inverter" costs about SEK350 but the method I give costs less than SEK100. Besides that, the primary object of the video was to show how easy it is to make one. The seconday object was for me to have fun making the video :-)
You should use 680 Ohms in each transistor - the two resistors are each in a different position. You can use two 1K5 resistors when you use 24 volt operation.
It is the value of these resistors that will determine the actual power you get out. If you had 10 transistors, then you can use them as 5 + 5, each with their individual 680 ohms resitor in the base but connect the transistor emitters together, and the collectors together - but you will still need 680 ohms in each transistor base. BR H
Yes I am using those transistors, thanks a lot, also can I ask what frequency the output is on the transformer and what the waveform would look like, thanks again sm0vpo.
The frequency of resonance is decided by the transformer. It is usually about 45 - 65Hz with ordinary mains transformers having an iron core. If you overload the circuit then the frequency rises.
The output waveform is a square-wave. There may be a very small (micro-seconds) leading spike, but this will dissapear as soon as there is a load connected.
No, it is the transformer. You can make the same circuit using a ferrite "pulse transformer". That will operate at typically 10kHz, but anything from 1kHz to 1MHz, depending on the ferrite and coils used. This is what is used to drive these portable flourescent tube lamps, but at a lower power.
So what effect would the frequency of the waves have on the circuit e.g power output, doesn't the inductance go up if the frequency does, and if so wouldn't the overall efficiency of the circuit go up, thanks.
The efficiency does rise with frequency, but most of these domestic transformer laminations start to "eddy" above about 120Hz. This limits them somewhat. BR H
So glad you liked the project. As you saw, it is ridiculously simple and works perfectly first-time, every time. There are more films in the pipeline, but my basic probelem is time, especially now wnen I have to cut up wood for winter heating, and prepare for the snow to come. Best regards from Harry - SM0VPO
Oh! What an interesting comment :-) I thought generating 230vAC from 12vDC is a good description. A "signal generator" generates signals with an input. A "character generator" generates bitmap code when correctly addressed. I still feel it is a descriptive title, since the AC is generated. But perhaps DC-AC converter could be a better title? Although to connect a slack-handfull of bits to the car and get 230 V AC could be considered "generating" in a power cut. Many thanks - food for thought.
its a great video but i do belive it might be labled wrong i am not new to ac/dc generation but not an expert either but i do belive this in an ac/dc converter rather than a generator
Toppen! Glad to know that you have found them usefull. I am still working on the next video ("My First Joint") but I am having a lot of pressure at work and so much to do with the house. Got to look after land, even if it is so full with antennas ;-) Best regards and many thanks for your positive comments.
Is there a way to recognize a transformer which has a split secondary before I wreck the casing? I have a few lying around and opened one (230V@60Hz to 12V 500mA 6VA) which, unfortunatly turns out not to have a split secondary. I´d like to implement this. Tak in advance!
Yes, connect your transformer to the mains and measure the secondary voltages. Another method is to count the wires, then mewasure the "continuity" (resistance). Most cheap transformers will only have 2 wires for the primary. If there are three remaining wires for the secondary and they all have continuity (conduction) then the chances are that you have a split secondary. At the moment I am working on an inverter that will work with a single secondary winding :-) Best regards from Harry SM0VPO
Hi, the two little lamps are 7W each, but the larger one is 11 Watts. A 36W transformer delivers about 10 Watts before it stops oscillating. A 200 watt transformer will deliver about 75 watts, which is enough to run a small color telly and a couple of lamps. If you use an external oscillator and driver then the 200 Watt transformer will deliver 200 Watts without any trouble, but that will be the subject of another film. Many thanks fory your coments, both of you. Best regards from Harry - SM0VPO
thanks very much.......
astor101974 1 week ago
My mom would love aa multivibrator
redraider5001 2 weeks ago
i want to know dose the transformer get hot
techguytyler 1 month ago
Excellent video! I checked your webpage and found your lower power versions of this inverter. They were just what I was looking for, small, simple and easy to make. Thanks for sharing your ideas with us. Keep up the good work!
aburguete 1 month ago
MULTIVIBRATOR LMAO!
austn12345 1 month ago
a very intuitive video, thanks for posting dude!!
herebesmewa 1 month ago
How hot did the transistors get?
CBtech4 1 month ago
haha you have to be an electronics teacher, my old electronics teacher had the same sense of humour as you, he plugged a lead into a plug and said to a kid if he holds onto the wires he will be plugged into the national grid and the kid was gonna do it lol he was like are you crazy, go sit in the corner XD but yeah also your accent sounds like your from yorkshire :D
lisn92 6 months ago
Hi HARRY!!!, well Can't tell you how glad I am too see you putting your knowledge where we can see it in action, Thanks and please keep um coming,, I may never get it at this late date, math pretty crummy" but I will keep trying for at least a little luck, If you get a chance, ck out "gotoluc" he too inspire's those like myself
Eddlipton 7 months ago
Hi HARRY!!!, well after having gone thru 3 yrs of youtube tutorials, 5 computors from junk via dial-upisp's, I'm still as dumb @ age 55 as I was @ 13. I 1st saw you @ your site a few years ago and was addicted to electronics since,,haven't had much success though. Will the TO-220's work? Tried this with them and they fried,,could be my circuit, I was using a multi-vib similar too this and it aint working to well. I also took apart a M.O.T. and rewound it to creat the center tapp trans for 2nd
Eddlipton 7 months ago
i killed myself, brains brains brains, oooooh, brains, brains, brains, give me brain, me eat your brain,
BaberJacks 8 months ago
Awesome! didn't know it could be done as simple as this!
miked351 8 months ago
Where does this buzzing sound come from?
tvolala1976 8 months ago
@tvolala1976 It's called 'magnetostriction' it is coming from the transformer. As the domains inside the transformer core swing from north to south they slightly change shape causing the metal laminations to knock together.
WaxingRadiance 6 months ago
So. I'm guessing I can use this same circuit with a rectifier to make any kind of dc/dc voltage conversion I want? Using different transformers of course.
72fr250 10 months ago
Harry, do the 2N3055's get hot when the AC generator is under load?
If so, would it be better to mount them on a heatsink?
ichbienauslander 10 months ago
@osmov is there anything that can take the place of the ferrite toroid, one that big is pretty expensive
ONLOOKERHOOKER 10 months ago
how do i com crying to you if i get killed? i will be DEAD!
it doesn't look like you made any kind of oscillator circuit at all and dont forget the heatsink!
powermaks 11 months ago
Comment removed
powermaks 11 months ago
how do i com crying to you if i get killed? i will be DEAD!
powermaks 11 months ago
@powermaks Its the new thing , its called HUMOR
8irger 10 months ago
do you connect the earth wire with the neutral wire or you cut off the earth wire?
david99soad 1 year ago
why not just convert your lights to led in your house and install a rectifying diode and run your house on dc much cheaper then using ac stick it to edison all you can
serialkiller1717 1 year ago
@serialkiller1717
The lamps were only a demonstrable load. 230V AC is often used to power other items.
Unfortunately a LED TV takes as much current as an old "fat" TV - it costs 4x more:
LED TV - SEK10 000
Fat TV - SEK 2000
My inverter - SEK100
An LED computer has not yet been invented, nor has the LED central heating pump.
But to cut out the comedy, LED lamps themselves are somewhat cold and not at all pleasant to use. As regards ecconomy, the "low energy" lamps are comparable. HL
sm0vpo 1 year ago
your my hero, Thank Harry
OzzRock95 1 year ago
@OzzRock95
Thank you - praise indeed :-)
sm0vpo 1 year ago
Harry ..Great vedio ..Thank you..What was the dounut made of ? Ferrite ?
247News1 1 year ago
@247News1
The "donut" was a torroidal (ferrite) transformer. They are more efficient than laminated transformers. Pity about the price. - HL
sm0vpo 1 year ago
I tried this project before seeing your video and I shocked myself with 550 volts and I have to tell you I think Im lucky to be alive.
NovusChaoMundi 1 year ago
@NovusChaoMundi
You should be very carefull with these voltage. It is easy to stuff 24V into the wrong winding of a 24V/12V transformer. As a matter of interest, you should ALWAYS have some form of load on the output, otherwise you can get minute spikes of up to 3000V. But they go as soon as you apply a light load.
I had thought about klqanking a 100nf cap across the output but I thought that would complicate the project unnecesarily. HL
sm0vpo 1 year ago
@sm0vpo I think the 100 uf cap will determine the cycling of the ac voltage about 60 cycles, good idea.
NovusChaoMundi 1 year ago
Oh, I have plenty of soviet transformers and resistors but no high-power transistors. Gonna find some and try to build something similar.
The question is:
Have anyone tried to recharge the input battery from the output via an ordinary charging circuit? How efficient can it be?
nrz666 1 year ago
@nrz666
If you have a torroidal transformer then the efficiency can be as high as 80% on load, but this drops as the load falls. A 200W inverter may be 80% efficient at 200W but only 10% at 10 Watts. HL
sm0vpo 1 year ago
That was the idea. So glad you liked it.
ASMOI I am using one of these as a backup for the 2138 Xmas lamps I have that dorn the house.
BR Harry
sm0vpo 1 year ago
best thing i ever seen on youtube . +5 star man
zidane444 1 year ago
So glad you liked it. I had a lot of fun making it .-)
sm0vpo 1 year ago
So glad you like it. I had fun making it - Harry
sm0vpo 1 year ago
Great...
can be use in my waterpump (1/4hp)?
Torry36 1 year ago
@Torry36
If you filter the output to get a sinewave you can. HL
sm0vpo 1 year ago
@sm0vpo
THANKS
so I will use 100 nf or 100 mf?
Torry36 1 year ago
@zidane444
Great :-) I love this sort of praise. The e-mail I keep getting is predominantly negative. HL
sm0vpo 1 year ago
@sm0vpo +5 star
energyalt56 4 months ago
I think this is on my top ten list of good videos , nice job
johncarl43447 1 year ago
I try my best. Thank you for the praise :-)
sm0vpo 1 year ago
So glad you like it - Harry
sm0vpo 1 year ago
This has been flagged as spam show
Free energy has been here for a while ,But Millions are spend in supressing that information,Get a motor that needs no gas or electric input at LT-MAGNET-MOTORdotCOM ,Join the revolution!
urgencyharviefcem 1 year ago
if i lower the ohms of the resistors can i use lower input voltage and get a higher output?
imaqtlolz 1 year ago
Yes
sm0vpo 1 year ago
cool vid. great job
ppsjsh 1 year ago
So glad you like it :-)
sm0vpo 1 year ago
in your diagram i saw only one 12v battery.. but your actual there's two 12v... what's the connection of another one 12v battery?... thanks
SuperRic74 1 year ago
Watch the vide and listen. You choose the transformer to suit the battery voltage: ie. use 12-0-12v transformer with a 12v battery, or use a 24-0-24v transformer with a 24v battery.
I showed a 12v transformer, but then here I have a 24v transformer.
sm0vpo 1 year ago
What about using a 220V to 4,5V transformer and a 9V battery? (and same configuration)? I must modify something if i use that stuff?
LucyiX 1 year ago
12-0-12v transformer with 12v battery, 9-0-9v transformer with 9v battery, and so on.
BR Harry
sm0vpo 1 year ago
HOW CAN INCREASE THE WATTAGE?
THANKS
ELPISON1000 1 year ago
its cool stuf ,,but what`s the freqency?????
MrRecobinjo 1 year ago
Fantastic !!!
ariesseeks 1 year ago
waooo . thats great
junevortex 1 year ago
BWAAAH OH GOD!! I've just killed myself so I decided the only answer would be to come crying to YOU!! TAKE RESPONSIBILITY FOR ME PLEEEEEZ!
aknutson11 1 year ago
can you run a laptop from this?
Iseekoutthetruth 1 year ago
Does this generate a 50/60 Hz wave and not some random high frequency wave?
Kargaroc286 1 year ago
nice video man.. done this at home and works great.
shid1288 1 year ago
thanks man! great video.. done this and works very well
shid1288 1 year ago
This has been flagged as spam show
oh i have been warned lmao
mike121223 1 year ago
very helpful video, enjoyed it, good humor and delivery, nice! thank you!
VolcanicDrum 1 year ago
That is an inverter, not a generator.
tAnUx1 1 year ago
Thank you i was trying to do that from very long time.But when I made th multivibreator it can't light even a bulb of ten wats i made it with two resistors of 6018 oms was that right.Pleas help.And sory if i have misspellings i am from bulgaria and i don't know eanglish perfect.
teodor0003 1 year ago
This has been flagged as spam show
How do i go about connecting the transformer? I'm not quite sure about it.
What does 230V 12V-0-12V transformer means?
limhw25 1 year ago
nice work thank to learn more thing you also upload or more videos
engrumi 1 year ago
ncie video
SuperSmasher97 1 year ago
can i use my transformer 220 vlts primary and 12 0 12 secondary backward?thanks
arigatooguzaimasu 2 years ago
if its ac/ac yes, if its ac/dc.not.
SuperSmasher97 1 year ago
It should work just fine.
CoolDudeClem 1 year ago
how quickly will the battery rub out if powering only lamps, torches, flash lights etc..
intelligentpizza 2 years ago
Thanks very much, it will take some time to digest but it sure looks like a great option.
TheTeslaJet 2 years ago
harry!!!! you are still the MAN!!! my system is still runnig great thanks you...my wife loves the money she gets to spend shopping! Now that i can save some money on my light bill, the reason for this is that you said somrthing at your homebrew page that set it off and BOOM it WORKED for me!!! HARRY IF I EVER GET RICH AND NEED YOUR HELP!!! I WILL CALL ON YOU BUDDY!!!! thank you chuck!!!!!
chuckluvs35 2 years ago
@chuckluvs35
How do you go about connecting the transformer? I'm not quite sure about it. What does 230V 12V-0-12V transformer means?
limhw25 1 year ago
This realy works I tried it.
jcasim 2 years ago
thanks smovpo i did 1 but my battery to fast to low batt im using 12v 7.4 ah not reach 1 hours you have idea to make longer to use this battery thanks................
boygatz123 2 years ago
Thanks Sm0vpo, you are great the is the circuit I was searching for since long time to use near my Marina deck. Please post more useful project. I will try to make this circuit very soon.
Bizbet 2 years ago
You seem to be a knowledgeable guy. Just wondering if you could tell me if this would work.. I have a 60 amp AC power supply. Puts out about 14 to 17 volts. Is there a way to turn it into a power converter ? What I would like to do is set up a windmill generator and use it to charge the batterys.
fred30680 2 years ago
Good video !
If you kill yourself dont come crying to me. lol
fred30680 2 years ago 8
Working on more comedy :-)
sm0vpo 1 year ago
great video with practical approach
climber1499 2 years ago
So glad you liked it. It was done in a hurry.
H
sm0vpo 2 years ago
very nice smovpo you know how to make cfl inverter please post if you have... thanks
boygatz123 2 years ago
I have done one, see my homepages.
sm0vpo 2 years ago
(UV light box under useful projects)
sm0vpo 2 years ago
@sm0vpo @sm0vpo Sir my name is rohit and iam from india.i have started an inverter project based on seeing your great video! i have indeed collected all the parts for the project,but i have a question? what is output ampere rating of the 12-0-12 transformer that is shown in your video.in india we use appliances with a rating of 220-230 volts with 50 Hz?
rohit5229 1 year ago
What power do you want?
If you use a 200 Watt transformer then you can get 100W before the load stops it oscillating. Use a 500W transformer for 250W, and so on.
BR Harry :-)
sm0vpo 1 year ago
Comment removed
rohit5229 1 year ago
is the pure sighn energy?
need4speed402 2 years ago
No, it is square.
sm0vpo 2 years ago
hi, thank you for this nice and instructive video i wanther how you calculate the transformer winding and wire gauge use else how can i upgrade this inverter to 5000w
thank you
soluciontv 2 years ago
The whole point is to use ready-made transformers. But if you use big transistors with heatsinks and a 500W transformer then you will have 500W. You can make two of them and parallel the outputs. The two will sync to each other. No reason why you cannot usw 3, or 4, all in parallel providing the inverters and transformers are IDENTICAL..
BR H
sm0vpo 2 years ago
Very nice video. I am guessing it makes a square wave of some kind.
FYI, I think you misspelled intelectual
JohnCBriggs 2 years ago
youtube should make a section in the comments for people to have conversations aside from the comments just about the video
zionroad90 2 years ago
They do not need it. Think abut it watts = volts multiplied by current. if either the current or the voltage is zero then the power is also zero. :-)
BR Harry
sm0vpo 2 years ago
How would I do this if I wanted to use your idea but instead of using a 12 0 12 transformer to make 220 volts I want to make 120 volts. How would I do that? What transformer would I use to say make 300 watt AC output?
lennemann23 2 years ago
No problem at all. It is the transformer that determines to voltages. For exaple, to get 117vAC from 12v use :
117v - 12v-0-12v transformer.
Many of the better quality transformer have a split primary (0-120v + 0-120v) that can be wired inseries for 240v or in parallel for 120v.
If you live in a na rea whre there are only 120v power utility outlet, then the chances are that your transformers available are all 120v primary.
Best regards from Harry
sm0vpo 2 years ago
Okay, but I want my voltage input to the transformer to be 12 volts not 24 volts/
lennemann23 2 years ago
For 12vDC to 120vAC use a 12v-0-12v transformer with a 120v primary (it is used backwards).
sm0vpo 2 years ago
those poor transistors, will someone please give them a heatsink? But seriously wont they be making quite a lot of heat?
pieznice29 2 years ago
No:
High current at no voltage = no power.
No current at high voltage = no power
BR Harry
sm0vpo 2 years ago
you are a great man! thanks for the info, it worked great for me, ,my wife laughed at me when i was putting it together,but stopped when she saw it working and recharging itself, so far it's been two weeks and still running. Thank you harry!!!
chuckluvs35 2 years ago
You are most welcome. I am so pleased people are actually using this :-)
sm0vpo 2 years ago
please how long will it last?
pispipe 2 years ago
Battery life?
Assuming you are pulling 100W in a 12v system then the 12v side has a current of 10 Amperes. With a 100A/h battery you would get 10 hours non-stop use, minus any inefficiency. In practice you could expect 7 hours solid, if the battery is charged.
BR H
sm0vpo 2 years ago
how can we cry to you when were dead lol :)
solorstars 2 years ago
Duh, dunno! Never thought of that ;-)
Ha ha!
sm0vpo 2 years ago
hi. can you help me ? i want to do a electric car .i use a electric motor 3.5hp altern current. what can i do to drive this motor with batteries .sorry be me english i dont speak well. thanks bye
mijaresk2007 2 years ago
Most effective way would be using AC motor(s) and frequency controller. The inverter build would be quite the same seen here using transistors with different parameters.
rpdigital17 2 years ago
That depends on the type of motor.
For example, if the motor has carbon brushes connecting to an armature with loads of brass segments, then you connect the field and armature windings in series and apply LOW VOLTAGE dc - eg 24v.
BR H
sm0vpo 2 years ago
thanks a lot!
domyaska 2 years ago
You are welcome. It was fun to make.
sm0vpo 2 years ago
you're not generating ac, you're inverting 12-24 volts to 115-230 volts
alwinovich 2 years ago
"inverting" = "converting". All generators only convert one form of energy to another.
All "generators" have some input power, whether it be a head of water (kinetic energy), diesel fuel, or in my case, the energy stored in your car battery.
If you want free energy then connect the DC/AC converter to your neighbours car battery :-)
BR Harry
sm0vpo 2 years ago
how to increase the watts?
mafijakijac 2 years ago
Use a bigger transformer and transistors.
Make several IDENTICAL inverters and put the outputs in parallel. They will automatically synchronise with each other. At least, my two 200-Watt inverters did
BR Harry
sm0vpo 2 years ago
"if you killed yourself, then don't come crying to me", hehe, good speech!...
thank you, this helped me.
mckill2007 2 years ago 10
first dying, then go crying to him?
that's a feat
alwinovich 2 years ago
.. and I did try to keep a straight face when I did it. It was not easy :-)
sm0vpo 2 years ago
I love comedy :-)
sm0vpo 1 year ago
how long do the batteries go till they need too be charged again
josifulis 2 years ago
Depends on the discharge rate.
a 100A/H 12v car battery will deliber 12x100 watt-hours = 1200. This means you can take out 1200 wats for 60 minutes, or 120 Watts for 10 hours.
Remember that the inverter, as described, takes about 5-Watts of "idle power".
Remember also that a transformer has an efficiency of perhaps 80%, rising to over 90% for a torroidal transformer.
BR Harry
sm0vpo 2 years ago
Hey Harry! Been a fan of your website for years,keep up the good work!
PhattyMo 2 years ago
Will do. So glad you liked the site. There are many more projects on the pipeline.
Recently got the sack from my job so I hope to start selling alternative power solutions - solar panels, inverters, regulators, etc.
BR Harry
sm0vpo 2 years ago
have you looked much at the bedini, perendev, or surge, or cycclone magnetic drive?
--you would totally love those
kdkinen 3 years ago
Yes I have.
I saw a film with the Perendev motor, but I believe that they are not real. In the film I saw it looked quite well made, but there was a shadow of a guy with an electric drill behind the thing.
I do not believe in perpetuial motion, otherwise I would have used my DC/AC inverter to run a battery charger to charge the battery that powers it ;-)
BR Harry
sm0vpo 2 years ago
The only problem with 24v to 120v ac or 240v ac, is amount of amps needed.
75 watt at 120 v ac will take about 3.75 amps at battery input.
Any time you increase voltage you will increase input amps.
The 2n3055 can only handle 10-15 amps, also the back EMF problems when running any ac motors will cause the transister to fail!
Good only for low watts.
TommeyReed 3 years ago
I agree totally. But if the lights have just gone out then my solution will put them back on again.
I used 24V to halve the current problem.
Commercial solar/wind power use 48vDC systems for the same reasons. High V = low current.
Large computer UPS (bigger than 300W) use battery voltages from 24v to 120v. I have stripped down a defective UPS having 20x 5A/H lead-acid batteries in it.
Also, the higher the batteru voltage the higher the efficiency.
BR Harry
sm0vpo 2 years ago
Thank you , i learned alot
what is your website ?
101Nissan 3 years ago
its the amps that kill not the volts... the voltage will throw you across a room (and burn you)
sHiMmYTheNomad 3 years ago
No, it is the milliamperes that kill.
It takes 10mA to kill someone.
Apply electrodes to the human body, using a conductive agent to improve the contact (as in medical electronics), it is possible to get the skin resistance down to about 5000 Ohms.
It only takes 50v (peak) to deliver that 10mA though a 5000 Ohm resistor. Thats why the internationally recognised lethal voltage is 50vDC (35vAC).
10mA and 5000 Ohms series resistor makes the human body into a voltmeter.
Your turn :-)
sm0vpo 2 years ago
Since this is a square wave inverter. This would only work with light bulbs right?
VergilX20 3 years ago
No. I am powering a telly, a computer, and even my oil-fired boiler with them. The circulation pump has to have a better sinewave, but eccomony lamps, flourescent lamps and sinple tungsten lamps all work perfectly. I was reluctant to try a computer myself because I thought that SMPSUs needed a good sine, but not so. Modern PSUs just rectify the input then chop the DC and stuff it through a HF pulse transformer. They don't care about the input form. Synchronus motors are the beasties that hate sq
sm0vpo 3 years ago
uare waves. BR Harry
sm0vpo 3 years ago
hello harry thankz 4 the video its works great, i used a 110v to 12v transformer
and i got 220v, am using 12v to power the transformer, what should i do to get just 110v or 120v, thankz
misa427 3 years ago
Put a small load on it and the volts will fall to 115v. There can miniscule spikes higher than 115v and you are using a digital multimeter (peak reading) at a guess :-) BR Harry
sm0vpo 3 years ago
"If you kill yourself, then don't come crying to me."
Ha-ha-ha-ha-ha-ha!!!
Harry's as funny as he is smart!
p3snooper 3 years ago
I had a load of fun makinh the film. At the time Maj-Lis (my wife) was upstais calling me to come and settle down for a cosy evening. The hardest part was trying to keep a straighr face, or it would not seem so funny :-)
sm0vpo 3 years ago
all in all very nice job
mayhem250 3 years ago
lol... would'nt it be kind of hard for me to come crying to you if this thing were to kill me? Dickhead.
mayhem250 3 years ago
how much load can you connect on that
mladenkorotaj 3 years ago
Depends on the transformer. As a rule the oscillator bursts into HF osc when the is about 50% of the rating of the transformer. A 250 Watt txfmr will give you over 100 Watts. A small 16" colour telly is only about 65 to 85 Watts.
I have just built one using a 500W 115-230v autotranformer and rewound the coils for 20v-0-20v + 115v + 230v and I am pulling 280 Watts out of it. Running a computer, monitor and a 135W TV set beside it. Havta switch them on 1 at a time, though - TV first. BR Harry
sm0vpo 3 years ago
This is basically a power inverter. If you need DC to AC power the safe way to do is to buy a power inverter but you don't learn anything.
pclover 3 years ago
Yes, that is exactly what it is. Here in Sweden, a "power Inverter" costs about SEK350 but the method I give costs less than SEK100. Besides that, the primary object of the video was to show how easy it is to make one. The seconday object was for me to have fun making the video :-)
sm0vpo 3 years ago
very good video, i love complex things explained so simply
Licurgoknox 3 years ago
So do I.
As a matter of interest, until a year ago I used to work as a multimedia "mentor" showing how to install radio gear.
sm0vpo 3 years ago
I LOVE YouTube. Makes a change from the e-mail "gimme gimme" complaints I get from my homepages.
I am always willing to share information and take great delight when other people can do something they never knew they could.
Many thanks to you and all the others above for the positive feedback. Positive feedback is what maintains oscillation. There will be more.
BR Harry
sm0vpo 3 years ago
Hi does it matter if I use two 680 Ohm 2kW resisters instead of 1.5? thanks
bellkxboy 3 years ago
You should use 680 Ohms in each transistor - the two resistors are each in a different position. You can use two 1K5 resistors when you use 24 volt operation.
It is the value of these resistors that will determine the actual power you get out. If you had 10 transistors, then you can use them as 5 + 5, each with their individual 680 ohms resitor in the base but connect the transistor emitters together, and the collectors together - but you will still need 680 ohms in each transistor base. BR H
sm0vpo 3 years ago
Thanks for replying, what resistors should I use if I want to use 2*6Volt batteries with a transformer that has 6-0-6 secondary's, thanks a lot.
bellkxboy 3 years ago
Oh, sorry. For 6v you should use two 150 Ohm resistors, assuming you are using the 2N3055.
BR Harry
sm0vpo 3 years ago
Yes I am using those transistors, thanks a lot, also can I ask what frequency the output is on the transformer and what the waveform would look like, thanks again sm0vpo.
bellkxboy 3 years ago
The frequency of resonance is decided by the transformer. It is usually about 45 - 65Hz with ordinary mains transformers having an iron core. If you overload the circuit then the frequency rises.
The output waveform is a square-wave. There may be a very small (micro-seconds) leading spike, but this will dissapear as soon as there is a load connected.
sm0vpo 3 years ago
Ahhh interesting, I thought it was the transistors that gave the circuit its frequency, thanks.
bellkxboy 3 years ago
No, it is the transformer. You can make the same circuit using a ferrite "pulse transformer". That will operate at typically 10kHz, but anything from 1kHz to 1MHz, depending on the ferrite and coils used. This is what is used to drive these portable flourescent tube lamps, but at a lower power.
sm0vpo 3 years ago
So what effect would the frequency of the waves have on the circuit e.g power output, doesn't the inductance go up if the frequency does, and if so wouldn't the overall efficiency of the circuit go up, thanks.
bellkxboy 3 years ago
The efficiency does rise with frequency, but most of these domestic transformer laminations start to "eddy" above about 120Hz. This limits them somewhat. BR H
sm0vpo 3 years ago
WELL DONE!!! **claps** i had no problem following your instructions!
XboxNerd08 3 years ago
very good
Lexum2 3 years ago
Praise indeed :-)
sm0vpo 3 years ago
Hello,
I am a fan of yours, I build modified and tested
your flip flop self contained tank circuit inverter, work's great.
Do you have any other AC inverters with self resonating frequency?
I am building a Push-Pull Ac inverter with an
555 Timer as the square wave driver, but i would like to build one with it's own resonant
oscillation frequency, therefore i could use more power without having problems with the feedback or reflected power.
Techno888 3 years ago
I am presently building a PIC controlled inverter. Will be posting some info when it is ready :-)
sm0vpo 3 years ago
So glad you liked the project. As you saw, it is ridiculously simple and works perfectly first-time, every time. There are more films in the pipeline, but my basic probelem is time, especially now wnen I have to cut up wood for winter heating, and prepare for the snow to come. Best regards from Harry - SM0VPO
sm0vpo 3 years ago
Great video, keep up the good work.
I built this one that you are showing
and i am using a large heat sink on the
transistors yo prevent thermal overrun.
Work's great thank you very much SMOVPO.
Techno888 3 years ago
Oh! What an interesting comment :-) I thought generating 230vAC from 12vDC is a good description. A "signal generator" generates signals with an input. A "character generator" generates bitmap code when correctly addressed. I still feel it is a descriptive title, since the AC is generated. But perhaps DC-AC converter could be a better title? Although to connect a slack-handfull of bits to the car and get 230 V AC could be considered "generating" in a power cut. Many thanks - food for thought.
sm0vpo 3 years ago
its a great video but i do belive it might be labled wrong i am not new to ac/dc generation but not an expert either but i do belive this in an ac/dc converter rather than a generator
kojack442 3 years ago
Toppen! Glad to know that you have found them usefull. I am still working on the next video ("My First Joint") but I am having a lot of pressure at work and so much to do with the house. Got to look after land, even if it is so full with antennas ;-) Best regards and many thanks for your positive comments.
sm0vpo 3 years ago
Great video!
Is there a way to recognize a transformer which has a split secondary before I wreck the casing? I have a few lying around and opened one (230V@60Hz to 12V 500mA 6VA) which, unfortunatly turns out not to have a split secondary. I´d like to implement this. Tak in advance!
Aquar1uZ 3 years ago
Yes, connect your transformer to the mains and measure the secondary voltages. Another method is to count the wires, then mewasure the "continuity" (resistance). Most cheap transformers will only have 2 wires for the primary. If there are three remaining wires for the secondary and they all have continuity (conduction) then the chances are that you have a split secondary. At the moment I am working on an inverter that will work with a single secondary winding :-) Best regards from Harry SM0VPO
sm0vpo 3 years ago
Hi, the two little lamps are 7W each, but the larger one is 11 Watts. A 36W transformer delivers about 10 Watts before it stops oscillating. A 200 watt transformer will deliver about 75 watts, which is enough to run a small color telly and a couple of lamps. If you use an external oscillator and driver then the 200 Watt transformer will deliver 200 Watts without any trouble, but that will be the subject of another film. Many thanks fory your coments, both of you. Best regards from Harry - SM0VPO
sm0vpo 3 years ago