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In Reply to: RE: traces at last.... posted by vinnie2 on October 24, 2016 at 06:12:38
I'd suggest clip leading RCA shell, negative side of speaker connection, power cord ground, and the ground lead of probe all together. You need them to all be at the same potential. Do all of this with the amp off.
With a RCA shorting plug in place I don't think you will see so much.....partly depending on if it is a push pull or SET amp.
If I'm looking to measure ripple voltage I do it at the power supply caps. AC coupling only....auto trigger works okay to start with.
Follow Ups:
Clip leading things together did not make a difference. I think everything is grounded together as it is. Your comment about checking the ripple at the caps did make me slap my forehead though, as you are right. Put my fluke on the last cap with it set on ac and got roughly o.5 vac, which explains the ripple being so high at output of the amp. Now I just have to figure out why I have so much more ripple than psud2 says I will have. I must have some parameters wrong for the trans or the caps. It usually gives a closer estimate than that.
I will give that a try. I use psud2 to check for ripple before I put the psu together and it usually is pretty close to right on, but I will check it with my fluke and see.
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