as far as voltages go, i think that something is not letting voltages to places the should be ? for me it looks like that 😀 i cant really explain how but something is not working or partially working in this circuit. maybe i should wait till i replace all caps and transistors and then to measure voltages ? what you suggest guys ? 😀
У вас есть ошибки.
Вот картинка того, как это должно быть.
Translation:
You have errors.
Here's a picture of how it should look.
Hugo
Вот картинка того, как это должно быть.
Translation:
You have errors.
Here's a picture of how it should look.
Hugo
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Now we have such a condition that the transistor Q2 BD139 is open more than necessary to establish half the power at the output. In order for it to close, you must either increase resistor R11 or decrease resistor R5.
But for everything to work correctly, you need to be sure that all other parts are suitable. 🙂
But for everything to work correctly, you need to be sure that all other parts are suitable. 🙂
I looked at the parameters of this amplifier. Yes, rather weak! K harmonics 0.625% at 20 kHz. THD 55 dB.
Only the frequency response is not bad, without emissions.
Only the frequency response is not bad, without emissions.
No, of course we're not sure.
Without output transistors the picture is like this:
the upper arm is completely locked and the lower arm is completely open.
The latest measurements gave this picture -
View attachment 1259692