Barrie,
Could the capacitors lost their main ground connection off the last capacitor
to chassis ground? If that has happened, you wouldn't have any filtering at all.
Best,
Will
*********** REPLY SEPARATOR ***********
On 4/23/06 at 7:37 PM Barrie Smith wrote:
>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
_______________________________________________
Amps mailing list
Amps@contesting.com
http://lists.contesting.com/mailman/listinfo/amps
|