Trying to Draw a Schematic from PCB and I’m seeking your perspective on this matter.

[opusadat]

Hi there to everyone. Academically speaking, I know very little about electronics. YouTube and DIY audio websites have taught me a lot about amplifiers. I'm trying to sketch the PCB board schematic that came from China. It's been a little unclear! Using a 15 volt zener diode, the audio stage is linked. also quite unclear in the OP-Amp input section; PINs 2 and 6 should be the input. What do you guys think about how well-built this circuit was?

Thanks
opu

 

[rayma]

The connections on the two op amps and level controls have some problems, check them again.

 

[opusadat]

Thank you, Rayma. I've looked over the PCB numerous times. I suppose the input part needs to be changed.

 

[rayma]

There may also be a missing resistor for each op amp.

 

[opusadat]

perhaps it might be that way (attachment). written in Chinese on the PCB, which is only an unclear marking or instruction. On the PCB, I could not find any additional resistors.

 

[jjs]

Hi there to everyone. Academically speaking, I know very little about electronics. YouTube and DIY audio websites have taught me a lot about amplifiers. I'm trying to sketch the PCB board schematic that came from China. It's been a little unclear! Using a 15 volt zener diode, the audio stage is linked. also quite unclear in the OP-Amp input section; PINs 2 and 6 should be the input. What do you guys think about how well-built this circuit was?

Thanks
opu

This design will only make smoke. 3 pairs of 5200/1943 is not enough SOA at +/-90V. It will have better luck on +/-60V.

Jeremy

 

[opusadat]

Thanks JJS, Its my mistake, on PCB board it is written 24-85V. 🙂