DIY Radio in less than 5 minutes!

[CriticalRedEggman]

This is awesome. Almost magic!!! lol I love it, thanx man. I will try this.

[taverned]

I'm unfamiliar with the 'breadboard'. When you were pressing the components into the board, you were indicating numbers.... this pin goes to this number-this pin goes to that number... What exactly were you pressing the components into? Is this something that requires soldering at a later time? What band was that receiving and how can you get it to receive different bands?

[buzzyB25]

add it all up and it comes to £35.21 its so cheap

[CraigMcAllisterMusic]

What range of values does your variable capacitor cover ?

[scuzzcrow]

I am looking to find a major in college right now and am interested in DIY electronic work like this involving circuit boards and all the vernacular involved and am wondering where you obtained this knowledge and if it is possible to find a major in college involving these topics, any advice?

[NorsicanMenace]

Nice work, but the 741 op-amp has no independent diode, does it? Where in this circuit does detection take place?

[ImSelfSchooling]

why should i buy all that stuff to build a radio...its expensive...so i rather buy new radio and i dont have to pay for shit and work hard to build it...you know what i mean..if i spend money on all that stuff...its like im buying a radio....

[syonastarlight]

@ImSelfSchooling the reason people do projects like this is not to simply have a radio, but actually understand how one works. Some people don't like being oblivious to the "magic" of technology.

[grimtango5280]

@ImSelfSchooling The point is not to have a radio but to learn how to make one. Most diy stuff will be more expensive than buying the real thing. They mass produce products which makes them cheaper.

[hovemarka]

do you can hear on radio stations?

[nasrmohmad1]

how i make this coil ?

[benchan85]

Hi Jo0ngle, I'm an industrial design student working on a radio project. Our group is exploring the world of DIY radios and we need your help. Here is what we have: LM741 Op Amp 200 k Ohm 200 microF Cap. 15 pF Cap. 47 pF Cap. 20-200 pF variable Cap. 32 Ohm Speaker (HOW DO WE ADJUST?) We're also working with 30 gauge insulated wire for coils...how much inductance should we wind to? Thanks! We need to know ASAP. Feel free to email me: benchan85@gmail.com

[Jo0ngle]

There's a new video there now, it's a 1 minute DIY video with schematics and animations, look for it in my channel.

[Donttouchtheswitch]

0:31

[Donttouchtheswitch]

1:29

[WASEEQ100]

Can u upload schematic of this project

[balrajpillai]

@dmctactic you fcking stupid? That's the reason he said "depending on the antenna you have, you can have more stations.."

[tjokpot]

I need a scheme!

[madamerotten]

You made an error. Pin 6 is the output of a 741 DIP-packaged op amp. Pin 7 is the +Vcc, Pin 4 the -Vee, pin 2 is the -IN and pin 3 is the +IN. With all respect, your approach to explaining this is abmysmal. I suggest that you show the schematic. For example, where is the +IN (pin 3) of the op amp connected? It should be biased to some voltage in order for the op amp to work correctly. And why does your coil have three wires coming from it? Also, your 220uF capacitor is probably backwards.

[Slovenija12345]

hey!

there is a similar circuits out there with the same ic

type in google op amp radio

[ashirfarooq]

hey first he talks ordanairy after he dosent

[Vincewerber]

Good show OM! The OP amp proved to be a good detector even without the diode :-) Back in the day I made several passive crystal radios and was able to get fair selectivity and a goodly amount of stations but only at night because the locals signed off at night...

[dookiebabii]

sir, so you didn't use an IC for this?

[faridn84]

loooool, you received Russian station

[HUSTLEBANE]

This is the ONLY video on youtube that tells you how to make a modern radio receiver......

[AKSoapy29]

Can you make a radio broadcaster?

[Jo0ngle]

@AKSoapy29,

I assume you mean a transmitter? Yes, if you google am or fm transmitter - you should find some useful schematics, please be aware of the legalities on using such transmitters in your own country.

[kebmann]

For every component you put in, I asked "Why? What does it do?"

[Jo0ngle]

@kebmann

Electronics is a fun hobby, this simple show isn't supposed to teach you how the components work, there are however plenty of electronics tutorials on the net, try searching for words like "electronics, tutorial, beginner" etc. on google, and I'm pretty sure you'll find something interesting. Good luck.

[Trayton60]

I love how he says "under five minutes" when his video is 5:33 long.

[peap90]

nice! do can you show me also the scheme?

[Jo0ngle]

@peap90,

I rarely use a schematics when I build simple stuff, it's just out of my mind as I know how these things work (well, at least practically), but I'm planning for a better video with schematics & more details in the future, so stay tuned.

[Donttouchtheswitch]

@Jo0ngle Stay tuned... nice pun.

[trigger32nz]

yeah ill show you how to build a Radio in less than 5 minutes all you need is a 33397924002302840842 chip 830853593-90-20nkjkjfide chip also ajhjddlsmn dhn and a jhdhguuuu x ashj dont forget the 66549993909 speaker cock make one with something we all might have

[people709]

yeah my gramps defantly had a 1x 100 ohm Speaker, 200k Resistor, LM741 Op-Amp (or compatible), 220uF Electrolytic Capacitor, 10 nF capacitor, 15 pF Capacitor and a 47 pF capacitor haha but great video

[Jo0ngle]

@people709,

Haha, thanks ;) Well..maybe you gramps had something like my tube radio (look at the other video)? ;)

[mytube30590]

hi

can you tell me exactly how much the coil capacity in henry?

thank you for this video

[Jo0ngle]

@mytube30590;

I haven't measured or calculated it, so no...sorry ;) But maybe you can figure it out, it has about 63 windings, with a coil that is 0.70 mm diameter, around a 3 cm. plastic pipe? It also has 5 taps about each 10-13 winding.

[Bollywoodfaiz]

cool....

[supermusicmaria]

yea i have all them materials.i dont work at radio shack.simple materials please!

[fispaulonunes]

Please,can you send me your project to my e-mail adress?it's fispaulo@bol.com.br.Thank you.

[shad0wburn3d]

Great Vid! Great Work!

[Jo0ngle]

@shad0wburn3d, Thanks, it´s very simple - I may make an improved video with details in the future!

[izne]

I would like to make myself a radio receiver within range 108 MHz and 137 MHz (yes, to hear air traffic controllers from the airport in my city, which is like 8 kilometers away from my place). I am on the last floor of 25-30 meter building. Is this "simple" way of doing a radio receiver sufficient enough to capture good audio quality in my case? How is the receiving range adjustable? Thanks.

[marioaleal]

Hi! Thank you for this video. What Frequencies can you receive? My son and I want to build a FM receiver (~88 - ~108) for fun.

[Jo0ngle]

@marioaleal. It´s mainly shortwave.

[FeignofCordor]

Have a go at making a Crystal set radio, no mains or batteries needed

[Jo0ngle]

@FeignofCordor, I´ve built many of those. Transmitters aren´t as strong as they used to be, so it´s very limited how well you can receive on such a receiver today, you also need high impedance headphones which aren´t readily availiable to everyone, albeit you can find a few of them on ebay. Besides - a loud functioning radio is a lot more rewarding for todays demanding experimenters to build, people want "instant-results" ;)

[FeignofCordor]

@Jo0ngle

I seen a crystal set on another youtube video and the reception wasn`t to bad but he also had a bulb working off the set that lit up quite brightly it was quite cool. I think they make a great Father and son project.

[sami96sm]

Looks like you have evry thing :D

[Jo0ngle]

@sami96sm. yeah, I´ve got some serious gear ;) Some like cars....and have nice cars...some like electronics...and have nice...well...instruments ;)

[ThePrudhviram]

can you tell me the schematic please

[Jo0ngle]

@ThePrudhviram, many people ask for a schematics, I do believe it´s possible to follow this build closely and do what I did, but you´re right, I should make a better video, including all the details as detailed as possible - I may do this in the future, stay tuned all.

[ThePrudhviram]

@Jo0ngle thanks

[markofgunderson]

What did you use for the antenna? How can I make one?

[marioaleal]

@markofgunderson Most of the time, the antenna is just any wire...I have used a strand from CAT5 cable and even speaker wire.

[Jo0ngle]

@markofgunderson, the antenna is very easy, it´s just a longwire (literally - a long wire!), you can also connect it to your house radiator (heating element), just watch out for shock! If you do this, make sure you are running the radio on a 9v battery instead of a 9v mains adapter, this is for your own safety, most likely nothing will happen, but yet... ;)

[mondays89]

Do you have a schematic I could see?

[deathDkid23]

schematic please..

[carnews333]

now, it it possible to do it with bose or jbl speakers



[ElGuapoJoe]

A schematic would be helpful.

[GoGZzz1000]

is this thing receiving FM ?

[CoolDudeClem]

How does it work without a detector diode?

[3mustardMoNkEyS]

@CoolDudeClem The 741's inputs are high sensitive NPN transistors so it replaces a standard germanium diode.

[martielezza]

its very nice video.

do you have the schematic ciruit of this radio?

can you send me to use in my college experience?

my e-mail address is marcelonoboru@yahoo.com.br

best regards

Marcelo - Brazil

[shadowC10ne]

Great video!

[tiputipu0052]

that video was wonderful...actually im trying to make a transistor radio since many many days, but i couldnt made it some how...i have all the components...and all i dont know is about the coils and where to put it...i mean i dont know where to put feedback coil and where to put tank coil in transistor radio circuit...can you help me in that, i mean first plz tell what is the function of feedback coil and where to put it in transistor(NPN 2n3904)..and plz also tell abt your coil.how you made it.

[Myndale]

One more thing, you say that on the 741 power goes to pin 6 and the output is pin 7, it's actually the other way round (you can see that from where you're hooking up the pins in the video).

[Myndale]

Great video, although it's not really obvious how you're hooking up those caps. Also correct me if I'm wrong but this would only be able to pick up short-wave, correct? A 2-inch air coil of 14 turns around a 1-inch diameter will make a 2uH inductor, and with a 200pF tuner that will resonate at about 8MHz, or smack bang in the middle of the SW band. To pick up AM you'd need something closer to 500uH, i.e. a couple hundred turns of insulated copper wire.

[jolieuke]

Yup! A schematic would be great!

[th3dig1tal0n3]

You must be receiving in SW range. You do not have crystal diode. How is AM demodulated in 741?

[uduogah]

hmm. a schematic would help

[zuaderbua]

Thanks! I´ll try it right today! :)

[mattsyme87]

I did one as a kid, a long time ago now. Loving the vids Jo0ngle, its good to see your stuff on HaD, you should put some links in for dutceforce. Good work mate.

[Radiosnmore5]

I got to build one. Great video! Try adding an LM386 audio stage. Good luck!

[Jo0ngle]

@Radiosnmore5

Nice! 

[najroe]

nice and quick.

slight "cheat" that would speed things up even more is to use a pair of amplified computer speakers and coil/cap combo.