Diode Tutorial & How to build an AC to DC power supply

[musikdoktor]

simple and excplicit.. Great Video

[2300mathias]

2:00 sounds of life (Pendulum) right?

[musikdoktor]

@2300mathias Lol you are rigt. :D

[zyga1922]

Thanks!

[MohammedMohammed21]

Awsome guy thanks so much you make it so easy to understand!!!

[junwson]

I blew up two diodes in the lab at school.....errr 3......:)

[cloudsyncinfo]

On 8:03 we witness the negative DC having not one but three diodes that would allow current to pass. How can a rectifier stop those two, when the one-way diodes are in favor for the current on that side of the negative DC output?

[vbird11]

These are the best lessons on electronics I have ever encountered! Thank you.

[moonbug71]

nice clear lesson, far better than books or the classroom.

[itschupacabra]

Great job with the video. I learned a lot from it. Thank you.

[Khamila1]

Im curious where those 12 dislikes came from. Was it from "know it alls" that have their panties in a wad because he maybe didnt mention some minor technicality? Or from total morons that couldnt follow this very simple hand held tutorial? Either way, great vid, thanks :)

[topless1967stang]

I haven't been to electronic classes in almost 20 years and forgot everything above just the very basics. After watching many videos and looking at different sites. This has been the easiest video to understand.

[TheDenLev]

Очень жалко,что так,доходчиво не объясняют на русском языке !

[GUNVALKERIE]

That was the most informative video... I know a lot more now than I did before... thanks for the tip

[dodlaisdodla]

AM A SCIENCE GRADUATE. REALLY YOUR HELPING ME A LOT SIR. THANK YOU. PLS GO ON POSTING.

[cristianiiacob]

great tutorial...!

[aravindhkumar2012]

i am a mechanical engineering student. i don't know anything about electronics but after seeing this video i understood many things and i got interest in electrical site too.

thank you very much for posting this video,

[ingkiller]

i got a 8V 200mA AC power suply,

can i make it DC with a diode bridge to power some led's?

[Afrotechmods]

@ingkiller Yes, with suitable resistors on the LEDs. Or, since LEDs are diodes themselves you could use AC too.

[ingkiller]

@Afrotechmods ok, so i have the leds running now, but i'm haveing an idea of makeing the leds fade,

i placed the blue leds above my fishtank and i want them to be on from

like 8 PM till 10 PM or something, and then turn off,

do you know a way to do this?

[oxide112]

Thank you. this was very helpful ! gonna check more of your tutorial's

[drstrangelove09]

Well explained! You did however create a mystery! Why do not multiple diodes share the current as one would expect?

[JFix61]

Very clear explanation, already use it (found it on Internet) but now the workings are more clear also :-) Thnx!!

[banjoshrugged]

Sincerely appreciate the simple and clear explanation. Very educative. Thanks

[CrazyMonkey124]

Can you use a zener diode for bridge rectifiers?

[Afrotechmods]

@CrazyMonkey124 That would be a really, really bad idea.

[CrazyMonkey124]

@Afrotechmods Heh, I figured considering their properties...Just wanted to check though, I'm just getting into electronics. Thanks :)

[snemeis90]

@Afrotechmods Hmm... If you had some 115V * Sqrt(2) Zener Diodes it could work. But that's just pointless ^^

[bila152004]

You're the best, keep it up!

[Texmurphy51]

What I dont like about the conventional theory is Current.

Current does not really exist, only electron flow which flows from neg to pos.

Otherwise this is a good lecture

[CrazyMonkey124]

@Texmurphy51 You said current, not conventional current. You shouldn't leave off necessary words then criticize people because you didn't properly express yourself. Albeit, I did understand you, I was just being a literal a-hole. >:p

[Texmurphy51]

@CrazyMonkey124 sez"You said current, not conventional current"

I referenced the video in my statement. He described current flowing from pos to neg,

IE Conventional Current, more or less Hole Flow.

This all breaks down however if you pass the current through a vacuum tube diode.

No pos charges flow through the vacuum, only electrons.

[CrazyMonkey124]

@Texmurphy51 Ah, I didn't notice him say that in the tutorial :|

[Texmurphy51]

@CrazyMonkey124

In the tutorial he shows current flowing from Positive to Negative.

Look at the arrows on his schematic.

He didnt mention anything about a vacuum tube, I am saying the whole idea of conventional current flow breaks down at that point.

[padis]

at last I understand it. tyvm!

[urbex2007]

great videos - just subscribed!

[bikernut1969]

For the people who gave this video the thumb's down. That's because your retards.

[humblesnurp]

You're a very good tutor! :D

[dmytrocool]

Where's the missing voltage i dont get it????

[seniorjohnl]

Anyone who knows could help me out. With polarized capacitors they need to be installed with the right polarity to not destroy them(?). This makes sense in DC circuits where you have an obvious polarity. When using them in AC circuits where the polarity switches constantly, isn't the polarity wrong 1/2 of the time?

[petermines]

@seniorjohnl You wouldn't place an electrolytic across AC or it would go with a bang unless it is an AC cap designed for motors etc. Electros would be used to smooth out the half wave to a ripple but then the maths has to be applied to calc the RMS value if your using a full wave or bridge rectifier.

[shatterhandeve]

oh god, this was divine

[ilikepieandthings]

Good explanation. I got a full wave erectification.

[TheSportsbot]

full wave rectification!!!

[ncm1980]

Excellent!

[pitchblack203]

great video.



[3011295jw]

This page has brought together a fine selection of people lol!

[3011295jw]

Dude you totally lost me when you said the words "with a 10 ohm load" at 6.45 wtf does that mean lol. Does he mean there is 10 ohms resistance in the circuit when the loads supplied :S Mind Fuuuuck!

[yoshitoJuarez]

Thank you!

[dragonhed123]

you didn't talk about how at higher levels the diode will eventually beable to alow curent both ways, can you talk about that more or did you say it and i missed it?

[DoofersCreepers]

Thank you once again

[jidun]

I really like your tutorials thank you, very much.

[maidiremirko]

fantastico!

[BassPounderX]

i want to build a powersupply that can drive a 12v fan that pulls 0.35mA can i just hook up a 0.35mA diode directly from the transformers 12v output?

[ngmngoc]

Very nice and helpfully . Thank you

[abby0910]

Referring to 2:50 .. You could put 5 diodes for more current with resistors in between right?

[Kiran73138]

nice



[kimoussitr]

ok now its clear enough i'll keep repeatin' this vid !

[emochicksrhott]

2:00 Is that some pendulum I hear?

[MFarizTamara]

This is very usefull for beginner... I'll inform my friends....

[NineMMtylenol]

Cool, I learned something today =D

[abilail]

i like it... it really good and understandable thank you .



[davidrobert2007]

Brilliant - well explained and very understandable - Thanks!

[Luckylearner]

fantastic tuturials. Realy helpful

[boobtoucherofnarnia]

Afrotechmods, im not electrician and im just learning, i want build a wind turbine with a ac motor from a washing machine and i want to convert the ac to 1-2 amp 12volt for a car battery. i got your explanation down but what parts should i use with for something like this?

[hitachi088]

@boobtoucherofnarnia might want to use some pulley to rise the ratio.

[2009VWJETTATDI]

Thanks for the video!

[KeithWasHere1]

where do you get the project board your working on with the + and - lines...i need something like that.how much are they?

[KeithWasHere1]

dude i have learned more in the 3 weeks of watching your videos than i have in 20 years by reading books...thanks.

[zackthegoth]

do you know if lee's electronics ships to the usa?

[blueshadow1996]

Thank you for this info..

[melkorize]

why this things doesnt look like that in ltspice?

[tylerwatt12]

We're working with AC and DC because it's heavy metal

[ashwin23m]

i have doubt wat is the correct voltage for an LED

[ItsOnlyRocketScience]

nice power supply, please check my'n out.

[xUltraVioletDreamx]

People who disliked this video, explain yourselves...

[freakin1random]

so when i pulled apart a broken amp that i got at a garage sale for 5 dollars and pulled out two 10,000uF (0.01F) rated for 71V, i basically made a steal is what you're saying.

[yonchvader]

Hi, I was going to build an AC to DC converter but luckily I watched this video before. I'm planning to covert 220VAC to 24VAC and then build a rectifier, separate the wire, on one end use a 470ohm & 130ohm (voltage divider) and feed the circuit with the two 5V and one 24V that it needs. Are my values correct? (I can make a video response if it helps) thanks in advance!

Your tutorials are the best on youtube. Keep doing them!!!!!

[mamu7mich]

AMAZING !!!

[TheDeathwallker]

PENDULUM!!! (happy Face)



[kimoussitr]

Thanks alot man :) Its exactly what I tried to do last class :)

[skylon25]

professionally done video

[dillionedison]

Great video & usefull.

[Mr71seventyone1]

sir can we make dc to ac how help me please

[R2Processor]

so DC is just negative voltage? If I'm wrong please explain

[kimoussitr]

@R2Processor why u said that ? DC is DC there is no negative nd Positive frequencies Its direct

[eksman187]

for drum n bass music on that mp3 player a thump up

[crow6145k]

Great video. I vouche for accuracy. You did a good job putting this together. Thanks.

[Buitreman100]

great video!!! thanks!!!

[Davaith]

Woah which video tells you about Bigger diodes? I have a diode that i salvaged from a relay circuit. From what i found its a glass diode p/n bzw03d36 but im not sure if im reading the data sheet right. I want to pass 15amps without burning it. With a 12v supply. Your help would be great.

[KeithWasHere1]

....is there any way to shield a wire wound resistor or variable resistor from creating too much EMI in other devices...snap core ferrite? shielding (copper or aluminum?) tape?..combo of both? or is this unavoidable (a power supply im working with pulses some 44nm 1watt blue laser diodes at either 50 or 400mgz ,still trying to figure out which.and i want to replace the lasers with resistors so i can use a different light source,led,but they say if i use wire wound then restrs i will get bad emi.

[KeithWasHere1]

o when you ay rectified? is that another term for the correction/compensation for the forward voltage drop?...kinda fuzzy on the term "rectified/rectifier".

[KeithWasHere1]

crazy question..is there any way of taking 4000 volts and bucking it down to 32v (all dc) and then somehow dumping the remaining voltage and getting rid of it somehow? capacitor? fan? something other than heat (which i imagine if it were converted to heat it ..there would be alot of it lol) i know crazy question but im just testing a theory.

[MucusFelidae]

@KeithWasHere1 "way of taking 4000 volts"

Stay away from that, it's dangerous.

[KeithWasHere1]

ok let me ask you this.im working on something where i know the voltage and the amperage...is there someway that i can determine the resistance using the available data? its a power source for 24 laser diodes rigged in series in 4 strings with 6 diodes per string@.32 volts @~1.5-1.7 amps per string. what im trying to find is the total resistance of each string... so i can use resistors as dummy loads in place of the lasers (projector hack) if anyone can help me it would be appreciated.

[MrFaradayMaxwell]

These videos are awesome!! Keep uploading more videos like this, pleaaseee!! =)

[mentemmarq]

excelent!

[liquidus2172]

please make a video about smps.

[lungstruck]

Excellent tutorial!  Gave me a good understanding of bridge rectifiers.

[axel1973w]

Is there an easy and practical way to "determine" unlabeled, unsoldered unknown diodes? Some way to find out their original parts name maybe if not printed on the casing?

[404gatito]

Thanks for uploading this video you really took the time to explain how things work.

I'm building my own wind turbine down here in Mexico but I want to understand power first.. thanks a lot!

[sebasromann]

intersante, no hay en español

[Afrotechmods]

@sebasromann He subido los nuevos títulos en este momento.

[idiotAREstupid]

@sebasromann no se Espagñol

[NFsilva6]

WoW This guy has THE VOICE !! I mean he could explain the Force to Darth Vader... ;p

[rasheid2kx]

how is positive current supplied from a negative cycle???

[Amber7913]

great job !!

[nemodot]

This is by far the best explanation I've found for begginers like me. Thank you! You clarified many of my questions.

Saludos desde argentina.

[prickerbush]

Is that Pendulum coming from your mp3 player?

[Doomload]

Amazing! Really useful!

Thx!

[joshstube]

@ 2:50

Can anyone explain why you CAN put LED's in parallel, but not Diodes?

What is the difference?

Or will my LEDs eventually fail?

[Afrotechmods]

@joshstube LEDs are so low current that it doesn't really matter. Most of the time you can't tell the difference in brightness with your eyes and they don't get hot enough for Vf to vary significantly.

[joshstube]

@Afrotechmods Thanks, I really enjoy your simplification in your videos. Although in this one I had to research further to find out about the 'Transformer Center Tap' before I was able to completely understand full wave rectification.

.

A question ??

I was surprised to find when opening up cheap unregulated 'usb type' chargers that most do this process in reverse. (diodes first, then transformer)

Do you know why?

They need higher voltage parts as a result, what would be the advantages?

[Electrodudeify]

ok, il try that, thanks



[HomoSapien2012]

great videos, a great teacher

[coilsinamotor]

i watch you videos as entertainment XD

[StinkyCheese9999]

You can reliably put diodes in series, you will not get a perfect load sharing but it will work if done properly (enough engineering margin).

It works because as forward current through any of the diodes rises, that particular diode's forward voltage rises. This can be seen in datasheets. If we had a large differences in forward voltage between the diodes it wouldn't work, but using same type diodes, usually even from same batch, forward voltage is close enough. Existing products prove this.

[Afrotechmods]

@StinkyCheese9999 The problem is that Vf drops as temp increases, so if there is ever a situation where one diode starts out with the lowest Vf and its temp rises significantly above the other diodes you get thermal runaway and that diode ends up taking all the current. Some products get away with it, but it is bad design and a single bigger diode should ideally be used.

[StinkyCheese9999]

@Afrotechmods

That is not a problem because Vf rises with current faster than it drops from temperature. Major manufacturers have successfully used paralleled diodes, to claim it would not work is already proven wrong with real world working products.

They don't "get away" with anything, paralllelization is a valid design strategy so long as you derate the components some so you have sufficient margin to cover the inevitable, minor variances.

Test your claim, against mine- scientific method

[StinkyCheese9999]

@Afrotechmods

That's not a problem. If using relatively similar diodes, the forward voltage rises with current far more than the temperature increases. It's not "some" products that "get away" with it, MANY products successfully demonstrate it works fine. As already stated you do have to engineer in a small margin but there is nothing poor about it. For example you can parallel light bulbs to get more light, parallel transistors to share current or change resistance. If it works it's fine

[MrMinimalSWN]

@Afrotechmods 1) What would happen if I would split up to 3 resistors in parallel and connect to each resistor a diode in serie?

2) And what would happen if I'ld place a resistor in serie between 2 diodes?

[myryonspoof]

your tutorial has helped me alot. thank you.

[Bylga]

If i have a 3300uf 16V capacitor in my old power supply can i replace it with a 3300uf 25V capacitor?

[PiIsARational]

@Bylga yes

[Bylga]

@PiIsARational Thank you.

[bong1318]

why to add capacitor at 5.10?what is capacitor exactly doing here ?

[pyr0jefr0]

why not spend 30 cents to buy a bridge rectifier...

[krakow10]

"half the time you've got a weird.. hump-shaped voltage, half the time you've got nothing." LOL BEST QUOTE EVER

[racoiaws2010]

yo're a god :D >>thanks for the video

[CIPHERJAY]

Could i use the 1N4001 diodes to build the full wave rectifier circuit??

[Afrotechmods]

@CIPHERJAY Yeah but those are only good for up to 35V RMS

[Chuechco93]

I like the style you present electronics. You should write a book like this :)

[jemezecreze]

MUCH love for pendulum... im still grey

[MIKON8ERISBACK]

I need a AC to DC power adaptor with the following specs:

12 volts direct current at 3 amps.

[fingerboy18]

What about Pi filters (CLC)?

[Drd4all]

Subscribed !

[littlereimz]

Pendulum - Vault @ 2:00 ?

[Boatdog357]

that was very usefull, now my question is How to make ac from dc or from a car batterie without buying a dc inverter.

[rrsd69]

great,great,great and simply great stuff!!! thanks.

[amartinjoe]

excellent presentation; perfect combination of text, diagrams, voice over narration, and videos. 

[sonicfuker]

Great stuff.  Thanks

[LiKBeAsT]

Thank you very much.

Very nice diagrams, explanations etc.

Congratz!

[bradas128]

hahah i like chips, they look like little bugs.

[BaronZombie]

You sir are an excellent teacher.

[smartzazi]

why not use a fuse?

[Afrotechmods]

@smartzazi A fuse is certainly a good idea.

[shfbdfi1273]

This bring back some nasty memories.

[EnderAcrobat17]

This is the best electronics video on youtube if you are a beginner like me... Great video!

[PantsLaRue]

These videos are exactly what I've been looking. Thank you !

[stevenismybro]

Thank you so much! Now I understand full-wave rectifiers!

[Electricsrb]

1 person doesn't have a transformer to change smaller AC in to DC.

[MetallicAus]

the person who disliked this video must have failed in his electrical course

[thesten99]

thank u thank u thank u .... i built one and now my cars headunit is working at 12v in my room ... il make a video about my set up soon....and thank u ones again ... before i was using computer power supplies...

[lorenzolo95]

ACDC woooo!

[KrissernD]

You're considerably better than my teacher.

[pboxinator]

Awesome thanks!

[TheKevintah]

Great job bro

[ozzyme1220]

The capacitor is the filter right? I gotta learn all this in a week :/ too much lol

[cheetawolf]

6:53 LOL

[reviathon360]

A way to smoth voltage out even more is to use inductors.

[89rafa]

what about DC to AC? How its done?

*sory for the spam*

[89rafa]

Great tutorial, all of them are.

[santiks]

why there is a need of 0.1 uf Capacitor? what does it do?

[arugulatarsus]

You can put diodes in parallel if you put small resistors in series. Love the show though. 

[graffin00000]

Sir if you were in my presence I would shake your hand. Having charging issues with my motorcycle. It seems I keep blowing voltage rectifiers which aren't exactly cheap. With this tutorial I now understand at least what the rectifier is doing. I get a/c current from the stator and this shows me just what is inside my rectifier that converts it to d/c to charge my battery. Now I can build my own for 10 cents instead of $60 to Suzuki. Thank you so much! Now to find out why this keeps happening....

[mondays89]

Love your vids, I'm gonna have to watch this one again to get everything down. Thanks for posting it!

[zinodikudu]

Afro, you have made me less dumb. :)

[bearing01]

Great job. Very clear explanation and demonstration. Added to my favorites. /John

[stuupper]

Awesome video! Very engaging and straight to the point. Can't wait to see your upcoming stuff :)

[goompapa]

Brilliantly described... total legend....

[sciguy14]

great, quality video.

[bazytherapper]

Very comprehensive. Thank you!!

[Demoman42]

Nice! :]