One Transistor Amplifier Demo

[03159264150]

good

[ExplosiveAnyThing]

what transistor did you use??

[AllAmericanFiveRadio]

@ExplosiveAnyThing

A general purpose NPN, like a 2N2222, beta about 200. The transistor is from a bag of NPN transistors I bought at Radio Shack.

[ExplosiveAnyThing]

@AllAmericanFiveRadio also why i cant just apply my signal dirext to the base? I can see that the amplification is more

[AllAmericanFiveRadio]

@ExplosiveAnyThing

You can, the results will vary depending on impedance of the output of the signal generator.

[TechLaine]

i have 2x100w amplifier and i also have heck of transistors...

can i do subwoofer output for that amp by useing transistors?

[AllAmericanFiveRadio]

@TechLaine

Sure. Google subwoofer transistor amplifier.

[CLUTCHNSHIFT]

EXCELLENT! Thanks for the lesson, AA5R!

[AllAmericanFiveRadio]

Thanks CLUTCHNSHIFT

[Azion111]

Listen to his voice on 4.41 when he says the word carpet.It's like he is having electric shock.LOL

Great video btw

[mortenrobinson]

first time i've seen a signal measured in ohm's :)

[Dri0m]

can i use it like music amp? :D input + to base and input - to battery, E to - and C to speaker

[AllAmericanFiveRadio]

@Dri0m

This video is about what a transistor does in an amplifier. Too build an audio amplifier find a diagram of an amplifier and use it. This video shows what the transistor is doing at each amplification stage.

[MrVDawid]

nice video

[AllAmericanFiveRadio]

Thanks MrVDawid

[miguelmouta]

@AllAmericanFiveRadio In five minutes you talked all a chapter, and clarified concepts . Congratulations.

[AllAmericanFiveRadio]

Thanks miguelmouta

[backstabingliar]

Cool. Thanks for the video.

[AllAmericanFiveRadio]

Thanks backstabingliar

[howrard]

Very cool ! thank you .

[AllAmericanFiveRadio]

Thanks howrard

[TheMACcar]

lol. Love the last comment! I'll just stay nutral fpr now. lol

[mackenzie235]

hi AAF, The best demo on feedback i have ever seen. So simple, well done. :-)

[AllAmericanFiveRadio]

Thanks mackenzie235 

[DiddyKongMusic]

Thanks! Very helpful.

[855h0le]

Wow I forgot a lot from school in 1992. It ALL Comes back 10x though! Thanks for the Video!

[tiputipu0051]

please tell the serial

[AllAmericanFiveRadio]

This NPN transistor is from a General Purpose package marketed by Radio Shack.

[AllAmericanFiveRadio]

RadioShack® NPN Transistors (15-Pack)

Model: 276-1617  | Catalog #: 276-1617

General-purpose silicon, high-speed, medium control switching 2N222 transistors.

[tiputipu0051]

i have 2n3904 general purpose NPN but it doesnot amplify tiny signals.....im asking because, please tell us how to make an Transistor AM radio very simple...we dont want IC like MK484 or ZN??? because its not avalible in our country ...we have 5 simple NPN transistors 2N3904... how can we amplify radio signals to drive a small speaker...please make a ten minute project on that..thanks

[tiputipu0051]

this transistor is very sensitive please tell the serial No. of this NPN transistor...its great....

[AllAmericanFiveRadio]

The NPN transistor is from a Radio Shack Pack of general purpose transistors.

[Pujc]

NIce video 5*From Hungary Cheers!

[AllAmericanFiveRadio]

Thanks!

[playfsx]

the multimeter is senitive not the tranzsistor!

[AllAmericanFiveRadio]

NOP

[Mushketer888]

about the carpet and foot is good idea :D

im gona try too )

[AllAmericanFiveRadio]

lol, it works, particularly in the winter.

[mrBr00k5]

Very nice video! Would this configuration amplify a dc current put into it?

[AllAmericanFiveRadio]

This would because there is no capacitor in the base circuit.

[SlykeThePhoxenix]

This is pretty cool.

[AllAmericanFiveRadio]

THANKS!!

[Rocism01]

bi dont understand... it amplifies a single signal and splits that signal into positive and negative...???

then what do i do if i want to amplify both my positive and negative signal...???

[AllAmericanFiveRadio]

More videos (Biasing Basics, Class A) (Biasing an Audio Transistor)

[t07xqj4o]

Great videos. With respect to a voltage divider configuration, is there a formula for finding the quiescent voltage drop across emitter-collector?

[AllAmericanFiveRadio]

Thanks. Basically it is Ohms Law. I think what you are asking how do I find out what the values should be. The best way to get started, is to look up the specification sheet on the transistor you want to use. The manufacture of the transistor will supply this along with sample circuits to use. Also look at, as many circuits as you can find that use the transistor or similar transistor you are interested in using.

[FelixTheHouseFreak]

Hi are you a member of ARF?

[AllAmericanFiveRadio]

Nop

[UserIsAnFBIAgent]

OMG I just learned so much and understood so much from watching this video.

Thank You So Much.

[AllAmericanFiveRadio]

Thanks,

I am working on a video about biasing transistors and tubes. It is going to be about the purpose of class A biasing. It helps to understand purpose first and the rest of the stuff will make more sense.

[mjok2004]

That is the best video I have seen on here so far

BRAVO!

[AllAmericanFiveRadio]

Thanks!

[ab5ni]

Awesome video! Best video I have ever seen on bias in 30 years of playing with electronics. You are a wonderful educator!

Best explanation I ever heard about feedback was to imagine the amp as a tire jacked up on a car spinning freely clockwise, and positive feedback would be push the tire every once in a while to keep it going, and negative feedback would be to drag your hand on the tire to slow it down a bit.

Keep up the good work :D

73

[AllAmericanFiveRadio]

Thanks!

[W8WHO]

Hi Rick,

Just had to send a note and thank you for the very nice videos you have been doing on electronics. Also really enjoy the vintage radio sections. I have marked you on the subscribe list.

I also have yor book on All American Five and have used it many times. Excellent book!

I have the radio you restored in this book. I purchased it a couple years ago from the YUSA auction. Keep up the good work.

Cliff W8WHO Ohio

[AllAmericanFiveRadio]

Hey Cliff,

WOW this is so cool!! And thanks!!

I have been having a blast with YouTube. Im hoping this video will get youngsters to experiment.

It was so neat getting an email from Bill Bragg about you asking to contact me. Im glad you got the radio and I was happy to sign your book. Hope you chief engineer enjoyed the transistor radio.

Best regards,

Rick

[AllAmericanFiveRadio]

Also you might want to download my new book. You can get to the download website at my YouTube Channel AllAmericanFiveRadio.

[ivan3x]

Nice video, thank you :) Combining shapes and experiment is a great way to learn.

[Radiation8]

I think ill give this a try, thanks for the video. I wonder if this could somehow be dont with no power, since the meter uses a battery?

[AllAmericanFiveRadio]

The transistor is changing resistance between the collector and emitter, and this resistance is polarized. It does not produce power.

[Radiation8]

Couldnt you take a longwire(say 50-75feet) or a long indoor(if your scared) wire to the Signal input to create a static/lightning detector?

[AllAmericanFiveRadio]

You would pickup static & lightning and probable a number of radio stations too.

[joernone]

Rick,

This was a great idea. Really demonstrates transistor sensitivity. I sort of have a better understanding of solid-state. Hook a few more together, then plug in your tv and keep rubbing your feet on the carpet. Not only free power, but good excercise.:D

BTW...I'm jealous. You have a Simpson 260 and I don't. They're great. But no problem...my son will soon be asking what I'd like for my birthday. Now what could it be?

Good vid.

Regards,

John

[AllAmericanFiveRadio]

John,

LOL

Believe it or not that's about all there is to it. Depending on your purpose determines how you bias the transistor.

Maybe I can use it to power my car, it has carpeting.

I bought the 260 when I was in High School and I just took out the batteries for storing.

Make sure your son understands what you want, you might end up Homer Simpson doll -- he must weight at least 260LBs.

Thanks!

Regards,

Rick

[jstrunck]

Hey AA5! I got one just like it! Even have the same case. The 260 is ALMOST bullet proof.

John S.

[AllAmericanFiveRadio]

I'm the original owner, I bought it when I was in High School. I keep the manual in the case behind the 260. You are right it is almost bullet proof, its simple and works very well.

[JimmerSD]

2sc828 or something like that? Never seen it demo'd like this. Cool.

[AllAmericanFiveRadio]

The transistor is from a Radio Shack pack of twenty or so. The top has the numbers of 145 05, on the front is 148 772-1 18-00. Thanks.