Re: cheap way to test "doorknob" capacitors? (fwd)

[<sroys@xxxxxxxxxxxxxxxxx>]

---------- Forwarded message ----------
Date: Thu, 11 Nov 2004 07:12:17 -0700
From: Gomez Addams <gomez@xxxxxxxxxxxx>
To: High Voltage list <hvlist@xxxxxxxxxx>
Subject: Re: cheap way to test "doorknob" capacitors? (fwd)


On Nov 10, 2004, at 7:14 PM, High Voltage list wrote:

> Original poster: <sroys@xxxxxxxxxxxxxxxxx>
>
>
>
> ---------- Forwarded message ----------
> Date: Wed, 10 Nov 2004 19:31:13 -0600
> From: Shaun Epp <scepp@xxxxxxx>
> To: High Voltage list <hvlist@xxxxxxxxxx>
> Subject: Re: cheap way to test "doorknob" capacitors? (fwd)
>
> I read that the capacitance of door knob caps are a function of 
> voltage.
> The capacitance is higher at high voltages.

  Also: I have seen standard barium titanate doorknobs used as tank 
circuit caps in RF induction furnaces, diathermy machines, and in tuned 
filter stages of radio transmitters.  How could that be if their 
capacitance varies with applied voltage?

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