Hi Guys!I want to build a capacitor leakage tester/ checker instead of buying something expensive.I was thinking of using my variac, followed by a voltage doubler to reach about 700V DC. I'm open for ideas and if any one has a better layout, please share it with me.
Can you get any one of these old tube-based testers where you are? The Eico 950A/B and the Heathkit models appear to be most common, at least they are ones I've used or seen at hamfests in the USA.
Hell yeah!Just bought an IT-28 waaay to expensive ...
An alternative variable high voltage DC supply can be made using the cheap ebay dc/dc supply that provides a pot settable output from 45V to 390V. That supply has a current limited output. Two of those supplies can have their outputs connected in series for up to 780VDC testing
Easiest to search eBay for 45 and 390 and dc.
Whoops, this was the link to more info on that dc/dc module:http://www.diyaudio.com/forums/power-supplies/297112-yh11068a-10-32v-45-390v-dc-dc-guess-control-ics.html
One of the reasons I went on that forum was to try and identify the control IC's in that psu. The short amount of observation I did is that the output, although regulated, does include varying levels of ripple and transient response due to to load changes - whether that is in any way noticeable in your application I'm not sure.
Hi Guys!I want to build a capacitor leakage tester/ checker instead of buying something expensive.I was thinking of using my variac, followed by a voltage doubler to reach about 700V DC.
I'm not sure how to do the metering. I could either use a 50uA moving meter in series with a 10k resistor followed by the cap under test,
or I could measure the voltage across the cap instead of the uA meter keeping the series 10K resistor.