28-03-2017, 06:14 AM
This is an electrolytic capacitor tester and reformer I made a little while ago.
http://www.forum.radios-tv.co.uk/viewtopic.php?f=15&t=3879&p=40688&hilit=capacitor+reform#p40688
It has found to be useful in reforming many electrolytics from post war radio sets. It is not always possible to reform all electrolytic capacitors, and I agree there is little point in attempting to reform pre war capacitors.
I also use it to make leakage tests on old film capacitors, it gives a reliable measure of leakage down to about 100uA. If the capacitor being tested is in a critical position like audio coupling, then I insert the AVO in series to get a more accurate reading.
The important factor is the tests are carried out at or near the working voltage of circuit the capacitor is used in.
I made a modification to the on / off swich, it was a double pole change over type and it also discharged the capacitor when switched back off.
Yes I did redo the scale.
The meter is not calibrated precisely but is probably about within 10% and that is all I needed.
Mike
http://www.forum.radios-tv.co.uk/viewtopic.php?f=15&t=3879&p=40688&hilit=capacitor+reform#p40688
It has found to be useful in reforming many electrolytics from post war radio sets. It is not always possible to reform all electrolytic capacitors, and I agree there is little point in attempting to reform pre war capacitors.
I also use it to make leakage tests on old film capacitors, it gives a reliable measure of leakage down to about 100uA. If the capacitor being tested is in a critical position like audio coupling, then I insert the AVO in series to get a more accurate reading.
The important factor is the tests are carried out at or near the working voltage of circuit the capacitor is used in.
I made a modification to the on / off swich, it was a double pole change over type and it also discharged the capacitor when switched back off.
Yes I did redo the scale.
The meter is not calibrated precisely but is probably about within 10% and that is all I needed.
Mike
