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Re: [TCML] overheating diode strings



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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