| Electronics > Beginners |
| How do I make a leaky capacitor ? |
| << < (4/4) |
| 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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