thanks for this! I have been looking into and trying to learn amplifier design for a while, this makes the actual fundamentals finally click!

@AllAmericanFiveRadio

14 күн бұрын

I’m glad this video has helped!! Thank you, and your welcome.

I wish you had been my electronics teacher in the 70's, so well explained

@ZygmuntKiliszewski

3 жыл бұрын

A very good presentation😀.

@AllAmericanFiveRadio

4 ай бұрын

Thank you, and your welcome.

Thank you for the great video on push-pull amplifiers.

@AllAmericanFiveRadio

6 жыл бұрын

Thanks

Excellent video thank you for the care you put on creating these, the are imensly helpful

@AllAmericanFiveRadio

6 жыл бұрын

Thanks

@jj74qformerlyjailbreak3

3 жыл бұрын

I Second That. 🤓Time To Get My Nerd On Back To The Lab.

Very nice video. Thank you for displaying your simulaion of the AC load applied to the two green LEDs with a sinusoidal input signal. I take it the peak load applied to the two center-connected LEDs is 12V. What frequency did you use?

@AllAmericanFiveRadio

6 жыл бұрын

One Hz

Thanks much. Best explanation on the web.

@AllAmericanFiveRadio

5 жыл бұрын

Thanks

Great demonstration! Really helps to visualize what's going on here. I am curious about how the push pull is affected when changing the input volume from your audio source. Does one transistor turn off completely at a certain threshold or can the push pull action be maintained at at both high and low inputs somehow? I'm guessing the transformer version of a push pull doesn't have this issue...?

@westelaudio943

4 жыл бұрын

Both are possible, if both are always on, it's a class A amp. If not, it's class A/B. Whether you use a complimentary set-up or a phase inverting OT doesn't matter.

@AllAmericanFiveRadio

4 жыл бұрын

The peaks are higher with more volume, and the peaks are lower with less volume.

@thomasmaughan4798

2 жыл бұрын

In a totem-pole arrangement like this, if you ever turn on both transistors at the same time they will be destroyed.

Nice display Rick,,, thanks'

@AllAmericanFiveRadio

4 ай бұрын

Thank you, and your welcome.

Hello, I'm trying to create a rail splitter using Op Amps. To draw more current and output power, BJT transistors in the form of complementary push-pull npn and pnp are used. Im trying to create the same thing but with Enhancment type complementary MOSFETs instead. It works the same way, but the problem is the mosfet gates are hard to bias and fully turn on, so the mosfets get very hot even with relatively small current draws. In both directions. The mosfets I'm using have a threshold of 4 volts. The gates are connected to the output of the Op Amp's output (the virtual ground). In theory and according to my measurments, the Op Amp's output should provide enough voltage to fully turn mosfets on for full push and pull current draws without even reaching the mosfets' absolute limits once a load is provided. Is there something I'm messing? Would it be possible for you to create a video on the subject? I haven't seen anyone do a high current MOSFET - Op Amp based rail splitter video. Oh, and I'm aware there are much better ways to split single supply rails or to have +/- supply rails. But I think this is a very simple and educational way to do a rail split. Maybe you would be interested in the subject :) Thank you for many great videos!

@AllAmericanFiveRadio

2 ай бұрын

Thank you. I f ypu are looking for an on/off circuit you might consider IGBT. Insulated Gate Bipolar Transistor IGBT IKP06N60T kzread.info/dash/bejne/n4BllrifmtjLedI.html IGBT Astable Multivibrator kzread.info/dash/bejne/gqJ1y6OhiqufmNo.html

Should function in a 'most responsive' manner. In October, they'll be remodeling a firehouse bunk room near where my cabin is located, and need an amplified, but not to the point of "blasting them out" speaker to monitor a non-dispatch radio frequency (chit-chat channel); this would probably work for that purpose. My only limiting factor is heat dissipation within the closed ceiling.

@AllAmericanFiveRadio

6 жыл бұрын

Thanks

Is there a special reason for using the IRF510? The P-channel IRF9540 is complementary to the N-channel IRF540, so I would expect to see that in the positive stage. The input capacitance is very different between the 510 and the 9540, so it may have some influence on the symmetry.

@AllAmericanFiveRadio

28 күн бұрын

THAT IS THE PARTS i HAVE ON HAND.

Thank you very much great for an amateur like me.

@AllAmericanFiveRadio

6 жыл бұрын

Thanks

is this a class a/b with mosfet in the output? i have several car amplifiers claiming to be class d topology but they really are like this design, ab with output mosfet

@AllAmericanFiveRadio

2 ай бұрын

I got as close to Class A as I could.

Great Video, thank you allamericanfiveradio.

@AllAmericanFiveRadio

4 жыл бұрын

Thanks and your welcome.

Thanks Rick, a quick question...Could parallel mosfets be configured to obtain more power in this circuit? Regards

@AllAmericanFiveRadio

Жыл бұрын

Thank you. Yes you could parallel them. Today you should be able to find MOSFETs that can handle the power you require.

Could you add capacitors into this circuit. If so, where? Also when I put loads at the rails the voltage is not stable. I only have the 24vdc supply and need stable +-12 V

@AllAmericanFiveRadio

4 ай бұрын

What is it your wanting to do?

Just wondering if germanium diodes the 0.3V kind necessary for the crossover or if you can use regular 0.7V diodes?

@AllAmericanFiveRadio

6 жыл бұрын

Silicon transistors,so silicon diodes, about 0.6VDC

that was vety nice of you. you explained workings of power mosfet but can i use it as amplifier ? i was thinking of using such as power booster of my mini amplifier .

@AllAmericanFiveRadio

4 жыл бұрын

To drive a speaker requires more current. If you take a look at this Lafayette amplifier it is a good example of what you need. You can download the PDF from this page. Lafayette LR 200 www.hifiengine.com/manual_library/lafayette/lr-200.shtml

Mantab..good vidio

@AllAmericanFiveRadio

6 жыл бұрын

Thanks

So the distortion in a dual-voltage source push-pull npn-pnp class B amplifier will disappear, when compensating diodes are in that place. OMG! Will it work with MOSFETS? Please share your opinion. Nice work.

@AllAmericanFiveRadio

6 жыл бұрын

These are MOSFETS. Works with junction transistors also.

Great explanation, I'm wondering would this push pull amp also work at 100V and 1MHz? (And using 1MOhm instead of 100k)

@AllAmericanFiveRadio

4 жыл бұрын

you would have to modify the circuit. Use 100V plus MOSFET's

@indrajitR

3 жыл бұрын

1mhz freq is RF . then youneed rf techniques. find RF linear amplifer at vu3inj.blogspot.com

@SheikhN-bible-syndrome

Жыл бұрын

@@AllAmericanFiveRadio could A1941 and C5198 transistors be adequate?

@AllAmericanFiveRadio

Жыл бұрын

@@SheikhN-bible-syndrome They will work for this type of determination. If you are building a audio amplifier, I would mach the specifications a little closer.

Hi Rick I hope all's well with you. Another great video as ever. When you talked about 'strobing due to the camera frame rate' it reminded me of something I wanted to pass on to you. Someone recently told me that if you look at the infrared transmitter of a TV remote control with your mobile phone camera, when you press any button on the remote you will be able to detect the transmitted light beam at the diode. It certainly works with my Panasonic tv remote and Samsung phone camera. I hope that I remember it next time that I think the batteries have failed in the remote. 73's . . . Andy

@AllAmericanFiveRadio

4 ай бұрын

Hey Andy, hope y’ll are doing well. I’m doing good and keeping busy. That very interesting, being able to seeing the IR from your TV with your phone. I’m going to try that. This reminds me of a IR experiment I want to try. Receiving audio from a vibrating services. I still have two unused IR Cootie detectors. Thanks Andy. 73…Rick

@AndyDaviesByTheSea

4 ай бұрын

Hi Rick, glad that you are well. Rick, what the heck is a Cootie detector?? . . . Andy @@AllAmericanFiveRadio

@AllAmericanFiveRadio

4 ай бұрын

@@AndyDaviesByTheSea I may use this video clip because I never said what I was going to use this IR transceiver for. kzread.info/dash/bejne/oXd4qcirgdSzk6w.html

Nice presentation . Thanks.....

@AllAmericanFiveRadio

4 ай бұрын

Thank you, and your welcome.

Very well demonstrated.

@AllAmericanFiveRadio

4 жыл бұрын

Thanks

Amazing video 😍

@AllAmericanFiveRadio

6 жыл бұрын

Thanks

Thumbs up done sir i have no training in tech school but because of your video tutorial i learned so much more power to your channel sir tnx

@AllAmericanFiveRadio

Жыл бұрын

Thank you, and your welcome,

@boybravo689

Жыл бұрын

@@AllAmericanFiveRadio sir can i ask something about the transistor outline 92 when the flat surface facing at you theres only two pin configuration weather its pnp or npn the left pin is emitter followed by collector and base and the other pin configuration from left is emitter, collector and base is my understanding is correct? tnx sir

@AllAmericanFiveRadio

Жыл бұрын

@@boybravo689 I do not understand what 92 is

@boybravo689

Жыл бұрын

@@AllAmericanFiveRadio sir the small plastic transistor which is transistor outline 92 or 92 package type sir tnx

@AllAmericanFiveRadio

Жыл бұрын

@@boybravo689 To determine the pin out, use the transistor number and look up it's datasheet PDF. Example 2N2222 2N222 datasheet www.onsemi.com/pdf/datasheet/p2n2222a-d.pdf

how will the input signal get to the gate when the diode is reversed biased at positive cycle?

@AllAmericanFiveRadio

5 жыл бұрын

The two compensating diodes are biased ON. Biased ON they are just a wire, so the signal flows as it does on a wire.

Why diodes? These are mosfets they dont have a .7 drop that needs to be overcome. In fact some mosfets dont even start to turn on until 1 or 2 volts. You could bias these with just resistors or a zener...?

@AllAmericanFiveRadio

4 жыл бұрын

Why diodes? Usually it's what I had on hand. I was building Amps for videos and got in the habit of using diodes. May not be necessary for MOSFET's. But there was no hikkup just above or just below Zero on the oscilloscope trace. I feel another video soon. Thanks for your question.

What is the usage of the variable resistor can i replace it with fixed one ?

@AllAmericanFiveRadio

6 жыл бұрын

You can ones you know the correct value. It there to set the bias.

Does this mosfets combination drive square wave pwm to step up transformer ? Reply me fast

@AllAmericanFiveRadio

3 жыл бұрын

Pulse Width Modulation Half Bridge MOSFET Driver TL494 2N2222 IRF510 kzread.info/dash/bejne/oIh5tsSbnpDKmco.html

Super!!!

@AllAmericanFiveRadio

6 жыл бұрын

Thanks

Thank you

@AllAmericanFiveRadio

4 ай бұрын

Thank you, and your welcome.

Can igbt transistors be biased with the same diode setup as the mosfets?

@AllAmericanFiveRadio

5 жыл бұрын

It should work

@midwestmangos2452

5 жыл бұрын

@@AllAmericanFiveRadio thanks, I appreciate the answer.

The input is what voltage?....and the wave input how is?

@AllAmericanFiveRadio

6 жыл бұрын

2volt Sine Wave

I understand how it works now! Yes! I am a visual learner!

@AllAmericanFiveRadio

3 жыл бұрын

Thank you

@realchristopher4334

3 жыл бұрын

@@AllAmericanFiveRadio The pleasure is mine.

In the schematic diagram the two diodesee are in the wrong polarity; for example the upper one (In the circuit diagram) Will prevent the positive half of the signal to pass to the N-Channel MOSFET..

@AllAmericanFiveRadio

6 жыл бұрын

Crossover Biasing Compensating Diodes kzread.info/dash/bejne/qGahq7abkaauhag.html

@DrHarryT

5 жыл бұрын

Electrons flow from negative towards positive. Electrons flow against the arrow of a diode also resembled in a transistor/mosfet junction. So as you can see the top diode is forward biased allowing electrons to flow from the input towards the +12 supply via the 10k resistor.

@LC-qi5ff

2 жыл бұрын

@@DrHarryT in that case the bottom diode is in the wrong direction

@DrHarryT

2 жыл бұрын

@@LC-qi5ff Exactly, electrons flow against the arrow of a diode. From negative to positive. [Actually electrons don't flow, but that's another topic.] It's a difference between terminology/perception of engineering and physics.

@thomasmaughan4798

2 жыл бұрын

@@LC-qi5ff "in that case the bottom diode is in the wrong direction" It is correctly shown. The diode creates a forward voltage drop of 0.6 volts, negative with respect to the source, and this -0.6 volts is applied to the gate, which acts like a vacuum tube; "pinches off" the current. incoming audio can drive it more negative, which does nothing since it is already pinched off, but on the positive swing of input allows the bottom MOSFET to conduct. The top MOSFET sees +0.6 volts on its gate, which pinches it off, and it uses the negative swing of input to turn it on. MOSFETS normally conduct and must be told to NOT conduct; this is like vacuum tube. Transistors normally do not conduct and must be told to conduct (by a small current from base to emitter).

How different it works to a class ab amplifier?

@AllAmericanFiveRadio

5 жыл бұрын

Not much difference, the low voltage off of zero is gone. AB realizes on transformer action to smooth the audio out and the distortion is at very low voltage.

How come the load is at the source? Wouldnt that stop the gate from triggering?

@AllAmericanFiveRadio

Жыл бұрын

If you are confused by the Compensating Diodes. This video may help. Crossover Biasing Compensating Diodes kzread.info/dash/bejne/qGahq7abkaauhag.html

@X7cF4

Жыл бұрын

@@AllAmericanFiveRadio Ah i was confused about the FETs them selves, I tried making this circuit myself, but controlling the gates via a PWM signal to make a class D amp, but the N channel mosfet was barly working, and I think it was cause the load was on the source

@AllAmericanFiveRadio

Жыл бұрын

@@X7cF4 I had this question about a month ago. The problem is that on the top MOSFET Gate, the pulse must be biased about 12VDC higher than the voltage that is on the MOSFET Source. The first video is about biasing the top MOSFET using a chip, no PWM just Frequency. The second video is an experimental circuit to bias the top MOSFET, with PWM and Frequency. Half bridge circuit kzread.info/dash/bejne/faicta-dcZq8gMY.html Project kzread.info/dash/bejne/gp-r09mEgNGsoKQ.html Good Luck!

@X7cF4

Жыл бұрын

@@AllAmericanFiveRadio Thankyou

I wonder what sort of output impedance that setup would be.......

@AllAmericanFiveRadio

6 жыл бұрын

With Diodes impedance would be very low, they start to conduct at 0.6VDC. With speaker the impedance is 8 Ohms.

@thomasmaughan4798

2 жыл бұрын

It would be a highly variable impedance. With no input, both MOSFETS will be turned off and the output impedance nearly infinite. With either MOSFET full on, the impedance would be nearly zero. what this means in real life depends on what you have connected it TO. Since there is no feedback, it also has no "damping ratio" and would be pretty bad for audio application.

Thanks 😊👍🙏💯

@AllAmericanFiveRadio

Күн бұрын

Thank you, and your welcome.

Does it amplifies audio signal

@AllAmericanFiveRadio

5 жыл бұрын

This will produce audio but with a speaker it will have a weak output. More current is needed to drive a speaker. This Lafayette LR 200 receiver has a push pull transistor output although it is not MOSFET. If you download the manual you can see out the output transistors will draw more current to drive a speaker. Lafayette LR 200 manual www.hifiengine.com/hfe_downloads/index.php?lafayette/lafayette_lr-200_schematic.pdf

@irtezahassan8218

5 жыл бұрын

Thanks for reply sir

👏👏👏👏👏👍

@AllAmericanFiveRadio

3 жыл бұрын

Thanks!

GOOD........

@AllAmericanFiveRadio

6 жыл бұрын

THANKS

👍👍👍🙏🙏🙏 Great !!!! Thanks !!!!

@AllAmericanFiveRadio

6 ай бұрын

Thank you, and your welcome.

@user-ub5su9vj6d

6 ай бұрын

😀@@AllAmericanFiveRadio