Electronics > Beginners
How do I make a leaky capacitor ?
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stevelup:
I was suspicious of Mr Carlson’s leakage tester when he first demonstrated it.

You absolutely have to test for leakage at or around the operating voltage otherwise it’s pointless.
David Hess:
Make a film capacitor using Nylon.  It will have plenty of leakage which even varies with humidity and temperature.

What you might want though is a capacitor with high dielectric absorption.  Read this article from Pease for some ideas about this.

oPossum:

--- Quote from: Cliff Matthews on June 26, 2018, 06:13:23 pm ---Today shows Carlson resorted to his old Heathkit IT-11 (so maybe that nifty new leakage tester didn't show the whole story..)

--- End quote ---

It showed the cap was leaky using lower voltage than the IT-11


--- Quote from: Cliff Matthews on June 26, 2018, 10:47:49 pm ---Carlson tested one of those two 450v internal transformer caps as 0.01uF with his new tester, but then his Heathkit tester found a fault at 50v.

--- End quote ---

His tester does not measure capacitance, Tek and Agilent meters where used for that.

13:32 Agilent meter unable to read capacitance of cap while still in the transformer
14:32 Tek meter reads 40.8 nF
29:50 Agilent meter shows no leakage
30:33 Agilent meter reads 0.019 uF (possibly incorrect due to leakage)
31:37 His leakage tester show the cap is leaky (using 27 VDC or less)
35:09 Heathkit tester requires 50V to detect leakage
joeqsmith:

--- Quote from: Hextejas on June 26, 2018, 03:21:41 pm ---I made a project from Mr. Carson's Patreon site and it tests for leaky capacitors. Well, it seems that all the capacitors that i have are new, hence they don't leak. In an effort to try and make a leaky capacitor, I tried reversing the polarity of an electrolytic and puttjng 30v DC on it. I dont recommend doing that. The sucker blew up sounded like a .38 revolver. Luckily I had it covered with a rag.
Anyhow, what would happen if I punched a hole in the side of a capacitor ?
And I seem to remember that a leaky capacitor exhibits a resistance, so maybe I could use a resistor instead.
What say you ?

Thanks.

--- End quote ---

I was wanting to see if a simple linear model could be used to model leakage as was suggested in his video.  I attempted to very carefully damage several capacitors and see how it effected their leakage.  You can read about it here:

https://www.eevblog.com/forum/testgear/using-low-voltage-levels-to-test-hv-capacitors-leakage-current/
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