Hi everyone,
I am now stuck and need your help. I bought, for about six months ago, a CD player of the type: Pioneer PD-S703. I wanted to do a DAC conversion according to Lukasz Fiku's instructions. I wound up a transformer and built the entire conversion inside the player. The problem was that I got a hum as soon as I connected it to my amplifier AUX input. Furthermore, I decided to try isolate the CD player, transformer, power unit and the terminal from each other in the hope that the hum would go away, but no it's still there and won't go away.
any ideas what could be the error?
Sends here some pictures of the construction and one oscilloscope picture with the measured B+ signal (Ch3) and the output signal (Ch2). It appears that the ripple in B+ affects the output signal DC voltage. What do you think? If so, how can I filter out all the ripple? Right now I'm testing with only one channel. 6,3 volt filament voltage appears to be flat (no ripple). Will be very happy if someone can help me with this!
thank you!
I am now stuck and need your help. I bought, for about six months ago, a CD player of the type: Pioneer PD-S703. I wanted to do a DAC conversion according to Lukasz Fiku's instructions. I wound up a transformer and built the entire conversion inside the player. The problem was that I got a hum as soon as I connected it to my amplifier AUX input. Furthermore, I decided to try isolate the CD player, transformer, power unit and the terminal from each other in the hope that the hum would go away, but no it's still there and won't go away.
any ideas what could be the error?
Sends here some pictures of the construction and one oscilloscope picture with the measured B+ signal (Ch3) and the output signal (Ch2). It appears that the ripple in B+ affects the output signal DC voltage. What do you think? If so, how can I filter out all the ripple? Right now I'm testing with only one channel. 6,3 volt filament voltage appears to be flat (no ripple). Will be very happy if someone can help me with this!
thank you!
