| Electronics > Beginners |
| How do I make a leaky capacitor ? |
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| german77:
Most failures in electronics are due leaky capacitors. Have you consider buying scrap electronics. I once found a dead graphics card with bulky and leaky capacitors for almost free, I replaced the capacitors and since then it has worked like a charm on my computer. Or you can make an aging capacitor circuit. Discharge and charge completely the capacitor the fastest you can multiple times. A 555 with a mosfet driver should do the work. The capacitor should get warm and start to leak in matter of minutes. You even can test the quality of the capacitor by measuring it's leakage vs time. |
| FlyingHacker:
Put a resistor and a Zener diode in series, with that combo in parallel with the cap? Then it only “leaks” passed the breakdown voltage of the Zener... .?? :-// |
| innkeeper:
maybe just put the word out for bad caps, I bet many would send you some if they have them on hand for the price of a postage stamp :) It's not like anyone has a use for them. |
| tautech:
--- 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. --- End quote --- :bullshit: All caps leak ! If you can't measure it you're not trying hard enough or your equipment isn't sensitive enough. Don't believe me, use an old analog meter in ohms range across a cap. |
| jolshefsky:
Reading this, I think there may be some confusion as to the double-meaning of "leaky." Mr. Carlson's tester is for parallel resistance which will "leak" DC current. (That is, an ideal capacitor, wired in series, will block DC current—once it is charged, no DC current will flow.) Electrolytic capacitors have an electrolyte that is a liquid or goo and they sometimes leak that material out, visually indicating the capacitor is no good. |
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