Hi Jim,
A schematic would be nice but having the negative side of your bridge
connected to the Variac does not sound right either. A Variac are an
AC device only and it should be connected to the AC sides of the bridge.
One side of the AC bridge to the variac outside and the wiper to the
other side of the AC bridge conn.
Frank
At 04:00 PM 8/28/2014, you wrote:
Hello Everyone,
I constructed eight strings of 50, 1000V, 10 A diodes. I assembled
and tested four strings without equalizing capacitors and resistors
and four strings with equalizing capacitors and resistors.The diodes
came off eBay from a company in China. All diodes checked OK on my
diode tester. These strings were then soldered into two full wave
bridge rectifiers powered by a variac. My scope shows a 60Hz output
on both which should be 120 hz output. The negative output string
that connects to the wiper of the variac becomes too hot too touch at
less than 5 volts output on both units. One of these when working
properly will be supplied by an 8 Mot stack.
All help will be greatly appreciated.
Thanks, Jim
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