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Capacitor Leakage tester issues
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AngraMelo:
Hey guys,
I built this tester from Mr. Caldera.
I had to make some modifications given that I didnt have exact the same components.
He uses the mosfet IRFP27N67K I used the IRFP460
He had a 1:1 transformer I used 2 back to back transformer. Both identical 24V 800mA.
My Ac mains is around 230V and Im getting the variable feature of it.
I used another small transformer in parallel (12V 100mA) just to power the LED indicator and the Volt meter. The grounds coming from both rectifiers are tied together.

My issue is whenever I try to measure anything that would draw say around 1mA or even less, the voltage goes to 0.
Even measuring the output with my Fluke87V loads the circuit enough to bring down the voltage around 40V.
I have no idea what is going on.
could you help me?

my Schematic attached

original video
Calambres:
I also made that project with IRFP460 and back to back transformers like you did and it works like a charm:




 It is a clever and simple design. I even made an article in my own web page decribing how I did it. It is in spanish but you may translate it with google.
001:
awesome work guys  :-+

Offtop:  tell me why this DIY unit popular in latin countries?
AngraMelo:
001 - You wont find those old style capacitor tester here. Like you find on ebay. Importing is a enormous hassle and extremely expensive (customs charges a insane percentage).
AngraMelo:
Calambres, did you have to use another transformer like me?
Perhaps the fact that I tied both grounds together is messing up the project?
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