If it's your signal generator thing, yes, it's very possible / likely to
have dried out caps (excess ESR).

Yes, the nippley appearance is likely ESR. But, if you say it's okay, then
it must be okay. Right?

Tim

--
Seven Transistor Labs, LLC
Electrical Engineering Consultation and Contract Design
Website: http://seventransistorlabs.com

"Cursitor Doom" wrote in message
news
Gentlemen,

The link below shows a scope trace of the output of a linear PSU (voltage
4.7VDC) with about 300mV of 100Hz ripple riding on it. This PSU is in-
circuit under load from the boards it supplies. Normally I would assume a
filter capacitor to be at fault here, but they all check out fine so
something else is causing this ripple. Note there is a characteristic
'knee' on the high peaks and I'm thinking this must be indicative of
*something* trouble is, I don't know what. If anyone recognises this
waveshape and knows what causes it, that'd be "awesome" - as our American
friends describe everything. Check it out:


https://www.flickr.com/photos/128859...in/dateposted-
public/