[Lowfer] Question

[Dave Brown]

----- Original Message -----
From: "Bill Ashlock" <ashlockw@hotmail.com>
To: <lowfer@mailman.qth.net>
Sent: Saturday, April 19, 2003 5:55 PM
Subject: Re: [Lowfer] Question


snip----
> the current and Rr are calculated. The resonant capacitor voltage comes to
> less than 1000v so there's nothing exotic required to build this.
snip--

True, nothing exotic, but watch the current rating on the cap-you may need a
series-parallel arrangement to keep the current per cap down to an
acceptable figure --  eg. 4700pF 500 volt polystyrenes (despite an excellent
measured Q value) typically fail at any more than about 1.5 amps
continuous.(at 180 kHz)  A practical continuous rating for them appears to
be 1 amp.
Other cap values and types of dielectric will no doubt have a range of
ratings but the continuous current rating for the required frequency has to
be determined experimentally for most types.

73
 Dave, ZL3FJ