[time-nuts] Function of cap to GND in isolation transformer circuit

Geoffrey Smith geoffsmithoz at tpg.com.au
Thu Jul 22 00:12:41 EDT 2010


Joop,
The cap is isolate any DC from the transformer,  The manual for TADD-1 has
this iformation at the TAPR site has this manual
http://www.tapr.org/~n8ur/TADD-1_Manual.pdf. 


On Wed, Jul 21st, 2010 at 9:46 PM, Joop <lous at xs4all.nl> wrote:

> Hi, 
> 
> I noticed in several circuits that the 10MHz isolation transformer in
> input and output circuits have a 6.8nF or 10nF capacitor to GND. How
> necessary is this for suppression of unwanted signals? Is the
> transformer itself not sufficient? I would expect common mode issues to
> be a bit worse with the cap in place.
> 
> The circuit I refer to can be seen here:
> http://www.uploadarchief.net/files/download/cap2gnd.png
> 
> The first one is an output as described in the Efratom FRK manual, the
> second one the input in the TADD-2 manual.
> 
> Cheers,
> 
> Joop
> 
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