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Between +in of TL072 and Master amplifier DSP output audio in series style. I think offset of TL072 add to Master and cause the problem . As I mentioned DSP output is mV and so sensitive!
Amazing and f...k! I add 47uf-16V electrolyte capacitor as you told and Master amplifier is clean totally!!!
Even I returned power supply of TL072 to ±7 and Master Amplifier is still clean !
Still have some distortion on high gain on Slave amplifier. Some quality check is on list and I will...
I have changed the supply voltage to ±10.5V ( to much problem to provide low noise and clean voltage :arghh: ) instead of changing op-amp to rail-to-rail .
Now the distortion of output of TL072 is around ±9V instead of 6.5V when supply voltage of TL072 was ±7.
But still I have noise on Master...
I have checked deeply the schematic and saw this:
Actually both capacitor and that resistor is available in Master-Amp. I have checked again all information and circuit . I think problem is ±7V power supply of non-Rail to rail opamp that I used . I am trying to find a rail-to-rail op-amp for...
Might be . But as I have told It is not exactly my issue. the main problem is when Gain on TL072 exceed than 25 I have distortion on Master Amplifier witch is non-inverting pin of TL072! in this topic I found one problem that is High-Gain.
But still I can not understand how to overcome on it...
I have found the Master schematic :woot: full PDF is in first post.
There is the spots that I got my wires from Master AMP.
PAGE 39 of PDF in first post of topic :
I put a cap but found out that this cap make phase-shift on slave and it is not desire for me.
Sorry for late...
I had some investigation on my circuit based on your kind informations ...
First: I have found that load ( which is slave amplifier ) doesn't have any affect on distortion. I disconnect the "To_car_amp" and nothing change! Master Amplifier still has distortion on its sound...
It is my circuit schematic
I have distortion problem in Audio_R1 and Audio_L1 when I turn the double volume which is To_back_vol_R more than ~70K .
Why output of this opamp affect on input of it ?!
I am trying to couple two amplifiers together without and phase shift in outputs . one of them is master and other is slave amplifier . From Master 80mVpp comes and go to TL072 and output of TL072 goes to Slave amplifier.
I don't have two amplifiers schematic. only TL072 is my design .
Also I...
Jfets has a tiny capacitor in its gates. I thought its better to have an small resistor to prevent inrush current and further damage to source of input signal ...
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