>
>
>>>>>Ä What mechanism recharges the capacitor?
>>>>>
>>>>>
>>>>>An incomplete discharge. Something very easy to do for an inexperienced
>>>>>person..
>>>>>
>>>>>? Bzzzzzt. You said recharge.
>>>>>
>>>>
>>>>The mechanisms causing apparent recharge were discussed in good detail
>>>>by Bob Pease of NatSemi in Electronics magazine (I think) a few months
>>>>ago. I'll post a reference when I find it.
>The mechanism that causes this is dielectric absorption. The model for a
>real capacitor includes many series resistors and capacitors that are then in
parallel with
>the primary capacitor value. When you short out a capacator, it takes a
while
>(depending on the type of capacitor) to discharge all of the stored charge
This is why
>you can short out a capacitor several times before the charge is depleted.
........
? Agreed, Eric. I have tried it. However, the case in question with
Carl Heuther was for a capacitor that is paralleled with a 200-ohm per
volt bleeder resistor.
> To see this, charge up an electrolytic cap and then
>short across its terminals....wait a few seconds and do it again. You
>should see a spark. I'm not sure how much
>of this you would see with a good oil filled cap though.
? I found that an oil-filled capacitors, as well as electrolytic
capacitors exhibit the phenomenon.
- cheers -
>Eric KR7A
>
Rich...
R. L. Measures, 805-386-3734, AG6K, www.vcnet.com/measures
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