julesgilson
Newbie level 2
I have drawn a blank on the specialist Commodore forums and I expect this is more of a general electronics issue anyway so hoping someone here could shed some light.
I have an old (c.1984) Commodore SX64 which has interference on the audio circuit - strange thing is if you drive the audio by changing voices (in synthesizer software) it suddenly mostly disappears until the next boot.
Here is a video of it:
https://www.youtube.com/watch?v=uFIeeDq4a8g
The noise appears to be in around 15kHz - but where is it coming from? Is it possible it is from the power supply?
I have already replaced all the electrolytic caps on the mobo as well as the SID and PLA chips.
My only course of action is to replace all the other caps in the system (which needs to be done anyway) but I would rather know where to source the problem.
Many Thanks
Jules
I have an old (c.1984) Commodore SX64 which has interference on the audio circuit - strange thing is if you drive the audio by changing voices (in synthesizer software) it suddenly mostly disappears until the next boot.
Here is a video of it:
https://www.youtube.com/watch?v=uFIeeDq4a8g
The noise appears to be in around 15kHz - but where is it coming from? Is it possible it is from the power supply?
I have already replaced all the electrolytic caps on the mobo as well as the SID and PLA chips.
My only course of action is to replace all the other caps in the system (which needs to be done anyway) but I would rather know where to source the problem.
Many Thanks
Jules