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You're missing the cool model: series resistance and parallel capacitance for the coil. When you use spice you'll want to model all parts like they are in real life. Great work. I have wanted to work on this myself

I'm an EE and also gold prospect. I'd love to work on this with you. You could solve for the critical damping in the 2nd order laplace. If you're willing to collaborate on this I'd love to. I'm a circuit designer and PCB for 20+ years.

I like the consent immensely, but I find I need to pause and reverse engineer some of the mathematics, as you don't really let us know where you are going with it. It would be nice to have a little more of the algebraic steps shown so that we can concentrate on transistor theory rather than the algebra. Still... great content thanks.

instantaneous thumbs down.. hideous explanation.. please stay far away from anything having to do with education sir

Спасибо вам большое, за ваши замечательные обьяснения этой ламповой схемы!!! Я как раз недавно собрал этот усилитель 5f1 из доступных мне компонентов. Конечно его еще нужно улучшать))) Ваши видео очень помогают понять эту тему!!! Спасибо! 😃👍

This is fantastic stuff. I like your style 👍🏻

This video was really helpful. Thank you!

Thank you kind sir

I have a 3 lead electret element that I want to use with a phantom power audio interface. I simply used the center lead on the element to positive, and one of the casing leads to the negative, then plugged the cable into the audio interface? I'm not hearing anything when I did this...what am I doing wrong? Thanks!

Should get larger white board.

Good explanation

Thanks :D

Nice that you are back.

I have 2 questions. FIRST.. I saw that usually C1 and C2 capacitors are electrolitics. Lets take capacitor C1. Plate A is positive and plate B is negative. It is possible to charge C1 in reverse connection (plate A on ground and plate B to positive plate of supply)? Because at one moment Plate A has zero potential and plate B has -5.4 potential. When Q1 is conducting Plate A is on the ground and Plate B is on positive side of supply. I understand that this is the phase of discharge of C1 (i saw that a charged capacitor in reverse connection discharge) but why potential on plate B (negative) begin to rise above zero? Shouldn stay at zero? So intead of that we have 0V on plate positive A and +0.7V on plane negative B. So electrolitic capacitors can be charged in reverse connection? SECOND I dont understand at the beginning how C1 is charged. Both plates (A and B, positive and negative) are connected to the positive plate of supply. Q1 is blocked so plate A receive +Vcc (5 v) potential. But why and how potential on negative plate B begin to rise? And if begin to rise, plate A shouldn get some electrons from the plate B and loose some potential? Because Plate B is negative. Thankyou.

WOW! THANKYOU SO MUCH

If there was a resistor in the collector, is the emitter voltage still half of Vcc? If there was -Vcc in under the circuit ? Please answer

hello sir , thank you for this valuable lecture, i have a doubt about the Rin which equal to 5k in your calculation , But Rin = R1//R2 + RinbaseAC R1//R2 = 9.2K and RinbaseAC= Beta (rtr +R3 ) = 100 ( 26+76) =10K => Rin = 10K + 9.2K = 19.5K not 5K ? Correct me if i'm wrong please

Bravo

Only time 🥳

Сan you please explain the purpose of R2 resistor? Look like capacitor will discharge through R2 if Vout < Ucap - 0.6v presents at op amp output. Is it expecyed behaviour? Will be better to connect this resistor to follower op amp output not to capacitor.

Can somebody explain me how the trans resistance (Rtr) is calculated (26mV thing)? Did I missed an earlier video ?

not ve, ve is 10% of vcc, vce is half

Hi, what's the reason for assuming Ve = 1V for temperature stability?

Since emitter follower doesn’t boost voltage, wouldn’t you want your input signal to be closer to the rail voltage of this stage if you were to drive a speaker?

Sharkit kapoj ni velu nathi tejanavo

nicely presented. thank you.

Alright. Not bad. I did follow but with 5V on the Vcc, and got Vc around 2.5V …. Now idea is to apply 0-3.3V via capacitor to base so it be -1.65 to 1.65V audio wave from DAC., boost it to 5V (can do 9V if necessary), then drive 1W 8ohm speaker. I’m assuming this stage boosts voltage, then will need current boosting stage.

So if my load is 4ohm speaker, then Rout needs to be less than 0.4ohm? Let’s say it’s a 10W speaker. So voltage to drive it would be v=sqrt(PR)=~6V. Therefore amplifying transistor needs to handle i=6/0.4=15Amps….. is my thought process correct?

Should cover practical implications of picking the resistors. Eg. 100k/10k = 10x gain…but so is 1K/100. What would be the difference between each pair?

Ok but now, what can I hook up to Vout? How much current and voltage will be at Vout?

I can't see the jump to the value of R2 at 30.48 time mark. What did you compute in your head to get that? Everything else flowed well.

This is a great video for explaining Thank you.

Excellent explanation! Very helpful.

signal generator as OUTPUT?????

I like it , thank you sir !

Thank you very much for the amazing video! Because of your video, my brain got enlightened! However, here is my two cents (I think I am right. May be!!!): the collector's current is not perfectly rectangular; instead, just below base's voltage under 0.7 volt should be little curvy because, at little below 0.7 volt, the collector current is still flowing but much less than when base's was 0.7 volt.

Thank you very much, that answers a lot of questions I had! THANKS

nice circuit diagram there

Electronics ain't easy but your presentation is super easy~. I am impressed that, without using a preamp, you can still get a good signal.

Hi bro nice topic❤❤❤❤😮

Love it... great talent explaining the subject at hand

i remember buy it seems like yesterday

i just love your channel, please lean towards rf electronics, my biggest dream is to be able to design radios and calculate values for components. A superheterodyne from top to bottom explained, from the input band, transistors impedance and impedance calculated for if filters would be a great series ... please try if you can...

Great work

Beautiful

This is collage level math. Thev theory is too. I think you lost most people. But as an amplifier you must run the transistor in the active region to cut distortion I believe.

A little clarification about RL, the load resistor. 2.2kohm is way too low if the supply voltage is 9V. If you look at the datasheet for the electret 6050, Vs = 2V, RL=2.2kohm and I=0.5mA. This gives us the voltage at the FET, Vf, using this formula: Vs-Vf=RL*I. So, Vf=0.9V. Now, RL can easily be determined for whatever Vs you have (should be between 0.9V and 10V though): RL=(Vs-Vf)/I. If Vs=9V, RL=16.2kohm. The greater RL is, the more gain the mike will have. To simplify things, I would use a 10kohm for RL (when Vs=9v).

7:02. Lets not assume Q1 turns on at some point. It doesn't say much. :-) Q1 can only turn on if it gets current from the cap at Q2 which means a cap that is discharging. Right? But the cap at Q2 could not have charged since the collector at Q2 was at 0 volts due to current flowing through it. The cap can only charge if the transistor is off with its collector at 6V.

Can you please tell me the voltage Vce ? Is it Vce= Vcc- IcRe ?becoz there is no collecter resistance 🥺