Recognise this trace?

[Cursitor Doom]

On Tue, 11 Jul 2017 18:53:06 -0500, Tim Williams wrote:

For the record, you didn't answer his question. I'm genuinely curious
now,
too.

Tim

If I answered you, I'd be answering that fucking troll too. And for free.
That isn't going to happen.

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[Tom Gardner]

On 12/07/17 22:51, Cursitor Doom wrote:

On Tue, 11 Jul 2017 18:53:06 -0500, Tim Williams wrote:

For the record, you didn't answer his question. I'm genuinely curious
now,
too.

Tim

If I answered you, I'd be answering that fucking troll too. And for free.
That isn't going to happen.

QED.

That's a revealing response.

Why am I, and probably others, not surprised.

 

[John S]

On 7/9/2017 10:10 AM, Cursitor Doom wrote:

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/128859641@N02/35684682551/in/dateposted-
public/

Kind of looks like the outline of my ex-wife.

 

[Cursitor Doom]

On Sun, 09 Jul 2017 13:24:04 -0500, Tim Williams wrote:

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?

Do I detect a note of scepticism here, Tim?
I've checked all the electrolytics with my ESR/Capacitance tester which
is claimed to be able to test for ESR in-circuit so I didn't remove any
of the caps in order to test them. I'm relying on the meter
manufacturer's claims that it's not necessary to do so and in the absence
of any evidence to the contrary, I don't see what more I can do.