I bought a digital 1 farad cap (ICBM-7244CRP) at a swap meet for $15 thinking I could sell it on ebay for a $30 or more.
I'm not sure how it works since it has a 40 amp relay inside to disconnect the cap from the outside world. I think the display is for power or voltage, but there are no switches to select a function. Only two connections to make.
Anyway, it doesn't do anything when connected to a 12 volt PS. But I can occasionally get it to turn on by interrupting the PS connections. And when it does turn on, it displays strange numbers of 00, 55 or whatever and then turns itself off after a few minutes.
I'm sure the actual cap is good since when it goes on, I can disconnect the PS, and the display keeps reading for awhile using the cap energy before going out completely. And as it goes out the display reads changing numbers and then dies out.
I don't understand the function of the 40 amp relay. Seems like with power applied, the cap could just sit there charged and the display could time out when there is no change for a long time to save the display power.
Is this cap any good, or does it have problems? What is a good test?
-Bill