i made a capacitor and i dont know how to test it help
attach to a 555 oscillator cct and check the frequency - this will allow you to calculate the value of the cap.
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Charge it to a few 1000 v and discharge it with a shorting bar.The spark should be convincing.A
A Leyden jar style cap ? What do you want to test ? Its capacity ? Measure its charging curve with an oscilloscope. Steve