On Wed, Oct 17, 2018 at 07:16 PM, <skv1958@...> wrote:
While trying to figure out what is going on with my 468 I decided to monitor the -8V and 15V supply DC coupled. When the trace starts to jitter there is noise on both of them. Not ripple, it almost looks like a digital signal. What would cause that? This has been a pretty cool trouble shooting experience.
Just loud thinking...when jitter starts in some circuit, sudden current draw
changes may cause sudden voltage changes, which may appear as noise. What are
the amplitudes of these noises on power rails? You may also want to check
ripple specifications and bypass capacitors. My two cents on this problem,
apart from the mention of some failing pots earlier...
Shailendra
I ordered new filter caps today. I'm unable to get any capacitance reading from C926 15V unregulated line. I'm hoping that will cure the issues. The caps will be here Friday. I already have the old caps out, while I was in there I replaced all the bridge rectifiers also. I replaced all the small caps in the storage power supply today and will do the big caps when they come. Figured I may as well give it the full treatment.
