Re: [TCML] Capacitive Discharge Pulse Mode with my VTTC

[Roger Smith <rwsmith@xxxxxxxxxxxxxx>]

On 9/8/2011 8:55 PM, Futuret wrote:
>   Roger,
>
> Thanks, I see how you have it set up, that's an interesting approach.
> Have you looked at the RF waveform on a scope to see if it ramps
> up nicely?  Just an antenna type scope pickup should be OK.
>
> Cheers,
> John
>
>
>
>
>
>
>
>
> -----Original Message-----
> From: Roger Smith<rwsmith@xxxxxxxxxxxxxx>
> To: Tesla Coil Mailing List<tesla@xxxxxxxxxx>
> Sent: Thu, Sep 8, 2011 9:37 pm
> Subject: Re: [TCML] Capacitive Discharge Pulse Mode with my VTTC
>
>
> On 9/7/2011 5:23 PM, Futuret wrote:
>
> > Roger,
> > Nice work.  It's not clear to me exactly how you applied the extra energy from
> the
>
> > capacitor and series choke to the tube plate... how the SCR was arranged
> circuit-wise to feed in
>
> > this energy?  Do you have a schematic available or a more thorough description
> > of the circuit?
> > Thanks,
> > John
> John,  here is a link to the circuit
>
> diagram...http://www.flickr.com/photos/29248051@N02/6128920446/in/photostream
>
>
>      It is fired in much the same way as a VTTC in staccato mode with an
>
> SCR in the cathode circuit.   Once it is triggered the charging
>
> transformer has to be turned off on tell the capacitor discharges so the
>
> SCR can turn off.   Then the charging transformer is turned back on and
>
> after about half a second the SCR is triggered again.    One pulse per
>
> second is the fastest rate I can do so far.
>
>
>
> Roger
>
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John,   No I haven't tried looking at it with a scope yet but I might 
try it some time.      The only thing that might prevent it from ramping 
up nicely that I can think of would be if I had issues with the core of 
the choke saturating.      One thing I would like to do is find a way to 
get it to ramp down a lot faster once it reaches its peak.    It takes 
about a half second before the SCR resets and I can start charging the 
capacitor again.     I think most of the pulse happens in about a tenth 
of a second or less.

Roger
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