Re: Capacitors self charging?
Robert Calloway ( (no email) )
Tue, 12 May 1998 20:06:41 -0500
Hello Jim, I have been saying all along, people need to pay attention to
capacitors.
I deal with 1,000,000 MFD and 500,000 MFD 25VDC capacitors all the time
and
the extra potential you recieve from them is worth looking at. Do you want
to see
some more? Wire in a duel DC relay wich will charge the capacitors from a
battery only when when the relay drops out. In other words, wire it up so
that the relay only uses power off the capacitors. The charge will be
instantanious to the
capacitors for a microsecond. Then apply a load to the capacitors through
the relay.
This is important.. only apply the load off the capacitors through the
relay to keep
from drawing current off the battery. Do not use the current directly off
the capacitor
as you are defeating the purpose. If you want to get really into it....
wire in a 3 pole
relay with a timer to dual capacitors and charge your battery back with the
extra
charge. I have schematics available if anyone wants them. PS: You must
excite
the capacitors from the battery to get the process going.
Robert H. Calloway
----------
> From: Breining, Jim C <jimb7563@dmci.net>
> To: KeelyNet-l@lists.kz
> Subject: Capacitors self charging?
> Date: Monday, May 11, 1998 10:51 PM
>
> I have a small bank of capacitors ( 8 3300mf 25v in parallel ) that I
was
> testing in a circuit. After shorting them to discharge when I was done, I
> checked the voltage and got a reading of not zero, but 16.5 mV. I took
> another reading a couple of hours later, and it was up to 25.5 mV. This
was
> Saturday 5/9. I took another reading just now (Monday 5/11 11:00 PM) and
> they were up to 81.5 mV. Readings were done with a Fluke 77 on the
> 300 mV scale. No equipment has been operating or even plugged in since
> Saturday when I took the first reading, and the caps have not been
> touched since except to take a voltage reading. This is all in my
basement
> work room which is kept locked.
> I remember seeing something on Keelynet about dropping a cap or spinning
one
> and measuring a voltage increase but not stationary.
>
> Any thoughts?
>
> Jim