Re: Doorknob caps
Subject: Re: Doorknob caps
From: Terry Fritz <twftesla-at-uswest-dot-net>
Date: Sun, 02 Jan 2000 15:30:37 -0700
This is rather late but...
It is very hard to say if a particualar doorknob cap is high current AC
rated or not. However, in your case, perhaps you could simply buy one and
connect it into your coil's tank circuit in parrallel with the regular cap
(with a slight retuning). Turn it for a while, torture it a bit, and see
if it burns up. If it stays cool and seems to work fine then you may have
a great bargin there...
One little indication is if it says 30kV or 30kVDC. If they say "30kVDC"
it is NOT a good AC cap. If it just says "30kV" then chances are fairly
good it is a trasmitting type. Transmitting caps will also "look" like a
fairly high quality device with big end terminals.
I know TDK made some brown colored caps in that range (I have one). It
works just fine in TC use...
At 08:20 PM 12/28/1999 -0800, you wrote:
> My local electronics surplus store has a bin full of 30Kv(I am
>assuming this a DC rating) .0272mf doorknob caps. They were asking $25
>each for them but have knocked them down to $10. I just wanted to ask
>folks if this a good bargain.
> Phil Heslin
>P.S. I would estimate that they had about 60 at this price as of
>12/27/99(San Diego area). If anyone wants to talk to me about picking
>some up for them please E-mail me off the list.