[ARC5] Capacitor Tests

[hwhall at compuserve.com]

Yep, if it holds a charge that well, it is a good one.  But there are good ones for such as power supply filtering that will not hold charge like that.  They leak, but the leakage is very small.

WayneWB4OGM
-----Original Message-----
From: Robert Eleazer <releazer at earthlink.net>
To: arc5 <arc5 at mailman.qth.net>
Sent: Tue, Jan 8, 2019 7:00 pm
Subject: [ARC5] Capacitor Tests

 Today I obtained yet another discarded stereo amp,with a nice big power transformer.  I also took two big caps out ofit, rated 8200 uf at 71V.  Unfortunately there is not much else in therethat is of much practical use, other than the screws and three 78 seriesregulators.  I have assumed in the past that if you charge up a capto a appreciable portion of its rated voltage and it is stillholding a large percentage of that charge days or weeks later it is a goodcap.  However I also have a nice new unused electrolytic cap that willnot hold a charge of 40VDC that well.
Is this a good way to measure if electrolytic capacitorsare healthy? Thanks,
WayneWB5WSV      

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