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Jim,
Your schematic should look something like the following, with a whole
lot more diodes:
(AC Input)
|
|--|>|--|>|--|>|--|--|>|--|>|--|>|--|
| |
| (-) | (+)
| |
|--|>|--|>|--|>|--|--|>|--|>|--|>|--|
| | |
(Negative) (AC Input) (Positive)
(output) (Output)
I'd guess you have one leg of the bridge turned around.
Dave
On 8/28/2014 7:00 PM, jj@xxxxxxxxxxxxx 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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