Re: Vacuum tube tank cap vs. transistor fast diode

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "Malcolm Watts by way of Terry Fritz <twftesla-at-qwest-dot-net>" <m.j.watts-at-massey.ac.nz>

Hi Craig,

On 17 Jul 2002, at 18:21, Tesla list wrote:

> Original poster: "Craig Fuller by way of Terry Fritz
<twftesla-at-qwest-dot-net>" <cbfull-at-hotmail-dot-com>
> 
> I came across an electical engineer's website the other day which said that 
> you should always put a fast recovery diode across the primary in a flyback 
> circuit, to reduce the stress on the switching device (for single transistor 
> feedback circuits only, I think).  I have always wondered myself why people 
> have not been doing this.

I wonder why anyone would bother. If you observe the primary voltage 
waveform of a flyback supply, you probably would too.

Regards,
malcolm

> Also, the vacuum tube coil circuits are not that different from the flyback 
> circuits, and I am hoping (when I can get a workshop) to get my VTTC working 
> with a fast diode instead of a tank cap.  Anyone have any experience with 
> this or already tried it?  It sure would be nice to do away with that 
> de-tuning problem in VTTC's whenever you put any kind of load on it(i.e. 
> drawing a spark).
> 
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