I've been testing and measuring this and that on my "growling" power supply, in
an effort to eliminate all possibilities before I dig in and change the diodes.
One thing that I noticed that has me puzzled is, as I crank-up the voltage with
the variac, a small arc from one of the oil capacitor cases to a very nearby
ground.
This happens just on about a 500 volt crank-up, and only once.
I've been using oil caps for years and have never deliberately grounded the
case, nor have I ever seen advise to do so.
I removed that cap and noticed no difference in the growl.
I also measured the capacitance and it was 32 mfd, as stated on the case. It
also has about 3 mfd from each terminal to the case.
Should oil capacitor cases be grounded?
TNX & 73, Barrie, W7ALW
_______________________________________________
Amps mailing list
Amps@contesting.com
http://lists.contesting.com/mailman/listinfo/amps
|