That's actually the first really helpful video about differential amplifiers. No math needed at first, but a fundamental understanding of what it does. Great job...

@AllAmericanFiveRadio

4 ай бұрын

Thank you.

The best explanation! Never though about differential amplifier as two A class amps together. My life is complete now. Thank you!

Amazing video! One of the clearest I've seen, thusfar.

@AllAmericanFiveRadio

8 ай бұрын

Thank you, and your welcome.

Thank you for the very instructive video. Besides the valuable content the professionalism in the way it is explained deserves an A+

@AllAmericanFiveRadio

6 ай бұрын

Thank you, and your welcome.

Excellent tutorial Rick! Clear and well explained as usual. As long as you focus so well on basics principles, basement knowledge becomes strong enough to support more on top! Thank you very much for your dedication preparing this learning material. Best Regards. Pablo

One of the best explanation. Thank you.

Many thanks for the video. it helped me understanding the differential amplifier so much. Many many thanks

@AllAmericanFiveRadio

4 жыл бұрын

Thanks and your welcome.

The beauty of a Differential Amp is that it only amplifies the signal Difference between the two inputs i.e. anything else, signal (noise) between an input rail and B+ or B- (or ground on a single supply typology) will not be amplified, thus a useful low-noise tool is born. When we modify the circuit by sharing a common emitter resistor (and capacitor, in some cases), the "Long Tailed Pair" that is commonly used for Phase Inversion in a Class AB Amp is created. This structure is used for the input of every Op Amp. You can also see this method applied to many Push-Pull Audio Tube Amps ( look at the schematic for Fender Twin Reverb, as an example). Prior to this, it was common to use just a single tube or transistor for Phase Inversion; the signal would be applied to the base of a transistor or the grid of a tube, equal resistor values would be applied for the Plate and Cathode of a tube (say 56k), or the Collector and the Emitter of a Transistor (say 10k), thus making a somewhat balanced output signal for the positive and negative rail outputs. The problem with this typology, is that the positive signal is referenced to the B+ and the negative signal is referenced to the B- (or ground), so noise from those two sources creep their way into the signal chain; not so with the Differential Amp. Also worth noting... the Long Tailed Pair makes a much more pleasing music distortion, whereas the Cathode Style Phase Inverter does not. You have to also remember that tubes came before transistors, and the basic gain typologies have remained the same.

@AllAmericanFiveRadio

4 ай бұрын

Thanks.

I wish I could put thousands of likes you touched a very powerful subject and the way you explained it it truely elevated my understanding and you deserve a big thank you.

I'm starting to learn and understand more about amplifiers every day in your Channel. thank you so much.

@AllAmericanFiveRadio

4 жыл бұрын

Thanks and your welcome. Glad the videos help.

You always present great videos on KZread. I look foward to your videos. Thanks

great explanation, greetings from Venezuela! :)

Very good job, Rick. Clear as glass. If I can understand it, anybody can. Regards, John

I like the way you explain this movie! Every single word I understood despite the fact that I know pronunciation of English words not very well. And this example with the music and the speech at the end - is just geniously! Thank you!

Thanks! Awesome video.

You explained it better than my lecturer! Thank you very much for the video! =)

alot better than my teacher ever explained it to me. Very informative and clear! thanks!

@AllAmericanFiveRadio

7 жыл бұрын

Thanks

Great video and top explanation, thank you

Rick - outstanding video. Just finished the chapter on op amps with my students, where we talked about diff amps. Doug'

Thanks DigiSDR The load resistors are always in the circuit when the signals are the same or different. And so are the emitter resistors, but their for biasing the bases. The most signal will be across the load resistors.

Great explanation, thanks for posting!

thanks alot for this video! great explanation like Vadim Harenco says.. I also never thought about two class A amps together!

@AllAmericanFiveRadio

4 жыл бұрын

Thanks

great explanation, much thanks,

Very nice explanation of how a differential amplifier works with very practical examples and experimental way of explaining how and what you can do out of it.thanks for the very tutorial lesson; I have learnt quite a lot.

@AllAmericanFiveRadio

4 ай бұрын

Thank you, and your welcome.

i hadnt seen this one,very well done.

@THEtechknight You can control the sound quality with the second input.

Excellent! thanks

Good video,great that you demonstrate it....:D

Very well explained ! Thank you !

@AllAmericanFiveRadio

6 жыл бұрын

Thanks

Great tutorial!

Thank you , that really helped clear things up for me.

@AllAmericanFiveRadio

4 ай бұрын

Thank you, and your welcome.

Absolutely brilliantly explained and I was suffering to understand other videos here thank you sir

@AllAmericanFiveRadio

Жыл бұрын

Thank you. hope this video helps.

Thanks twirmd I don't know of any reason why MOSFETs could not be used in a differential amplifier. I bought some more MOSFETs for experimenting with making a flip-flop circuit, hopefully easier to build. I'll try a differential amplifier to, sounds like a good idea.

This was very Educational I enjoyed it . Thanks////// I look forward to your videos. Thanks again.

VERY CLEAR! THANK YOU!

@AllAmericanFiveRadio

5 жыл бұрын

Thanks

Clear explanation. Thanks for making this video...

Very good thx!

HELL YEAH! Now am gonna change majors. haha

Well that clears up a lot of confusion, thanks!

@AllAmericanFiveRadio

6 жыл бұрын

Thanks

Men may come and men may go, but your legacy will life forever. Thank you.

@AllAmericanFiveRadio

2 жыл бұрын

Thank you and your welcome.

gud to hv practical application with theory...luv the way u taught👍👌

@AllAmericanFiveRadio

6 ай бұрын

Thanks

thanks helped a lot !!!

@CassetteMaster Sounds like it will work. Anything that is the same at both outputs is a null between the outputs. It should be greatly reduced or removed. This video is a simple example, there are chips that can do a much better job. I would Google the information.

super !! tks a lot for this perfect explaination

@AllAmericanFiveRadio

Жыл бұрын

Thank you! And your welcome!

@AndyDaviesByTheSea Hey Andy, I don't remember if I have or not, it was an exercise and lesson in one of my Heath Kit courses. And yes with analog recordings this process is difficult. Today I would used digital recordings. Using my digital sound applications, I have sync-ed two sound sources, recorded by two different digital devices, of the same thing for over 10 minutes and they remained in perfect sync. I was amazed because I remember how difficult it was, now it is nothing. Regards Rick

Super video as always Rick

Great as usual. Please do some video about audio transformers, impedance transformes, etc. THANKS.

amazing explanation and demonstration. thank you

@AllAmericanFiveRadio

9 ай бұрын

Thank you, and your welcome.

Can't believe what I just saw. That's quite an amazing experience.

@AllAmericanFiveRadio

4 жыл бұрын

Thanks, and your welcome.

thank you!

Thanks jenko701 Sounds like it will work. Anything that is the same at both outputs is a null between the outputs. It should be greatly reduced or removed. This video is a simple example, there are chips that can do a much better job. I would Google the information.

Fabulous!

Great video thanks

Thanks falcon02012 Yes, it seems like magic too.

Nice video, keep it up, thanks for sharing it:)

@AllAmericanFiveRadio

Жыл бұрын

Thank you.

Wow amazing explanation. Thank you so much sir.

@AllAmericanFiveRadio

8 жыл бұрын

+Mohammed Said Thanks

Very nice video. To follow along and get the same results you MUST have a matched pair of transistors and preferably even matched resistors, etc..

@AllAmericanFiveRadio

6 ай бұрын

Thank you and your welcome.

Dear AllAmericanFive Radio I really appreciate your effort in putting this video with explanation. If you dont mind can you please provide the transistor type(model) used so that I can understand why those specific resistor and cap values used.

Very useful video about differential amplifiers. Thanks

@AllAmericanFiveRadio

4 ай бұрын

Thank you, and your welcome.

this is amazing!!!

@AllAmericanFiveRadio

7 ай бұрын

Thank you, and your welcome.

Wow! That was very interesting , thank you.

@AllAmericanFiveRadio

5 жыл бұрын

Thanks and your welcome.

@dmottern1952 Thanks Doug, They are very interesting and useful too. Hope your class finds op and diff amps interesting. From the response I'm getting, a few KZreadrs find them interesting also. Rick

Excellent explanation. Thank you very much.

@AllAmericanFiveRadio

4 ай бұрын

Thank you.

@Serpico261 Yes. The output is not high. I ran the output from the transformer to an amplifier. At this point the output is low because it is the difference between the two transistor outputs. It is useful and it is easy to amplify. And the video is not fudged. what you see is what happened. The transistors are 2N2222.

@hmerrett If you have just the sound you want to remove recorded, it is possible to remove it, one channel at a time. I think there are sound applications that can do this all in the computer today.

Excellent demonstration.

@AllAmericanFiveRadio

2 жыл бұрын

Thank you, and your welcome. Hope the video helps.

@AndyDaviesByTheSea Hey Andy, I don't know how many Heath Kit courses I have done, well over fourteen. About the last one was building an helium neon laser in the Laser course. About the last lesson in this course was using the laser to make a sound interferometer. I could hear myself walking and cars passing by the house. I made a video on the interferometer using a laser pointer. In another video using the laser pointer I audio modulated it and the sound quality is very good. Regards, Rick

Thanks CassetteMaster That would be interesting to try, to remove white noise. It is in the background. That just might work.

Nice and good information!

@AllAmericanFiveRadio

7 жыл бұрын

Thanks

@saarike

7 жыл бұрын

AllAmericanFiveRadio You're wellcome. It's nice, that people do those videos. I have learn a lot just looking those videos and it is fun.

How interesting. People said that there was a mistake in the movie Atomic Blonde, that when Loraine Broughton recorded David Percival and Aleksander Bremovych separately, and pieced the recordings together to play for MI6 that the recording would have had different background sounds because of parts of the conversations being recorded in bars and clubs playing music and having lots of background noises. However, if she wore a wire recording the conversations, music, and background noises, and had a wire in her coat recording just the music and background noises, that got hung up out of earshot each time she went to the venues, she could have taken the music and background noises recording and passed it through a differential amplifier with the recording of the conversations etc, and removed the music and background noises leaving just the conversations. So technically it wasn't a mistake because her spliced recording had no background sounds, just the conversations, and Eric Gray and Chief C were so intrigued with her story, and thinking Percival was Satchel, that it didn't occur to them that it was strange that the recording had no background sounds. Cool.

@AllAmericanFiveRadio

5 жыл бұрын

Oh yes this is a very useful circuit. I'm sure that there are now digital differential circuits that are even more amazing. I think I'll make a laser interferometer and bounce the laser off a window to hear the audio in that room.

@palotitoe Thanks Pablo, The basics are super important. Everything depends on that knowledge. Regards Rick

Thank you for the video. I would like to understand how this circuit works. How the volts are placed on the elements. Is it possible to show how it works ?

@AllAmericanFiveRadio

Жыл бұрын

Transistor, How Does it Work in a Circuit, Demo kzread.info/dash/bejne/qKdn3LeBlM_Zibw.html Transistor What does it do in a circuit Visual Demo kzread.info/dash/bejne/oWWtybaThKuqnqg.html Transistor Amplifier for the Beginner, the basics kzread.info/dash/bejne/nmGmyLKfgsq0eps.html Biasing an Audio Transistor kzread.info/dash/bejne/faiMp5msZafSk6w.html

thanks !!!

This is a good demonstration

@AllAmericanFiveRadio

3 жыл бұрын

Thanks and your welcome.

Thanks!

I am so appreciated

@AllAmericanFiveRadio

8 жыл бұрын

+Weimin Leee Thanks

It is very interesting... i want to make like this... can i know how or what kind of signal did you put in..and how? Is it alright? Ad please teach me how to put an audio transformer?

very good example,thank you

@AllAmericanFiveRadio

4 жыл бұрын

Thanks

The transistor type is NPN. The transistor are two 2N2222.

Killer explanation.

@AllAmericanFiveRadio

7 ай бұрын

Thank you, and your welcome.

very good tutorial

@AllAmericanFiveRadio

7 жыл бұрын

Thanks

Hi Rick, nice clean demo. Have you ever stripped a sound off a recording like that? I can see the possibility but I could imagine that you’d get some heterodyning unless you could maintain perfect in phase sync. Kind Regards ... Andy

If you had two radio stations and if one of the stations bled over on to the other, in thery you could remove that station with a diff amp buy taking a clean copy of one of the stations signal and the copy that had both, run them through a diff amp and you could get rid of the unwanted audio and just get the audio you wanted. what do you think.

Thanks skylon25

Best explanation

@AllAmericanFiveRadio

3 жыл бұрын

THANK YOU!

@AllAmericanFiveRadio Hi Rick, Yes, I guess if you can keep count of things it’s got to make it easier, never thought of that. You say ‘... in one of my Heath Kit courses...’ I don’t know that they did course but I imagine that they must have been hugely informative; I’ll have to look into that a bit more it sounds very interesting. Ps did you see my ‘Soldering tip’ video? Kind Regards ... Andy

Thanks linuxford

best explanation sir.

@AllAmericanFiveRadio

7 жыл бұрын

Thanks

does this cancellation have to do with the phase of the 2 identical signals or am i overseeing sth very simple here..?

@AllAmericanFiveRadio

4 жыл бұрын

Yes, if you where to have two inputs 180 degrees out of phase this circuit would add them together. To the limits of the circuit of course. If you over drive it you'll get distortion.

super sir very nice explanation

VERY INSIGHTFUL

@AllAmericanFiveRadio

5 жыл бұрын

Thanks

Thanks vibra64

Hey is this having a suond? Or just only type of sound?

@AllAmericanFiveRadio

4 ай бұрын

Same sound will be canceled.

When you hear voice like this one you know you learn something :D

@AllAmericanFiveRadio

5 ай бұрын

Thank you, and your welcome.

Thank you.

@AllAmericanFiveRadio

3 жыл бұрын

THANK YOU!

I wonder if this could cancel out DC bias's background noise while playing back.

I absolutely love your teaching style. Thank you so much for this, friend.

@AllAmericanFiveRadio

4 жыл бұрын

Thanks and your welcome.

Thanks Albinorama

Thanks lawnmowerrecycler

I would expect the signal cancelling if the outputs had inverse phase (out 2 180 deg from out 1, for instance) Since here the circuit is the same at both sides, I guess there is no phase inversion, so, why they cancel eachother? I would expect both signals summing, not cancelling

@AllAmericanFiveRadio

3 жыл бұрын

If both signals are in phase at the output, there is no electron flow, no output.