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Rabbit 16v 21st January 2021 03:15 AM

tried original bridge rectifier as it checked out on the bench ok. 5a draw approximately and about 2mvac. Tried the replacement rectifier and got about 60mvac on each rail. rectifier got hot to the touch as well as output IC. Pulled the rectifier out of the circuit and went back to the 1/4w halfwave setup and verified that I still have both pos and neg rail voltage at 33vac. I didnt leave it on too long as I didnt want to cook another diode.

Perry Babin 21st January 2021 08:49 AM

It could be that the module is defective. Did you try a different module?

Rabbit 16v 21st January 2021 04:55 PM

This did occur to me the more I thought about it. Initial testing in the very beginning had this same IC installed. I will swap in a new one tonight and see what I get.

Rabbit 16v 28th January 2021 01:25 AM

Ok removed original IC, verified 33vac on pos rail. installed a new IC, does the same thing.

Perry Babin 28th January 2021 02:38 AM

The rail voltage is DC.

I'm not sure what you meant by the voltage you posted in #251.

I think you stated that with either module installed, you get excessive current draw. Is that correct?

Rabbit 16v 28th January 2021 03:01 AM

I was checking before the diode at the rectifier so I could verify the square wave as well.

Correct. With old and new IC installed in the same position (separately, of course), high current draw and the diode gets hot.

Perry Babin 28th January 2021 03:35 AM

I don't know how the slow diode would affect the current draw when there is more of a load (from the module). It would drive more ripple to the rail caps when loaded so that could be part of it. Before I'd write it off, I'd try the high-speed rectifiers.

Rabbit 16v 29th January 2021 02:18 AM

Ok, I will get a couple of those coming. Thanks again!


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