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Re: [Amps] FW: Single Band Amplifiers One Power Supply

To: Amps group <>
Subject: Re: [Amps] FW: Single Band Amplifiers One Power Supply
From: Bill Turner <>
Date: Wed, 30 Nov 2016 20:02:54 +0000
List-post: <">>
------------ ORIGINAL MESSAGE ------------(may be snipped)

On Wed, 30 Nov 2016 19:00:25 +0000, you wrote:

>  Has anyone ever used non-contact current measurements for plate and grid 
> current.
>If you had sufficient shielding you could run the plate and cathode DC leads 
>thru next to
>the IC so that the plate and cathode currents cancel leaving grid current as a 
>Probably have to use a copper shield around the IC so that no RF screws it up.
>  I have seen noncontact passive meters where you pass a conductor thru it but
>they are used mostly in cheap auto battery and charging systems.
>Bill wa4lav


This technique works very well for AC but I'm not sure about DC. At my
previous employer before I retired we used the technique to subtract
filament current from working current in fluorescent lamps. Worth a
try for sure. 

73, Bill W6WRT
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