----------
> From: mbgupta@julian.uwo.ca
> To: Buhatarau@aol.com; KeelyNet@DallasTexas.net
> Cc: Fred Walter <fredw@mks.com> magna-pak@lonet.ca
> Subject: Re: Mr. Thumpy
> Date: Thursday, August 20, 1998 2:31 PM
>
> Mike,
>
> I have build several of these and my experience has been:
>
> 1) The capacitors develop a memory and don't fully discharge its better
to
> use a number of them in parallel. This reduces the internal resistance
and
> provides a better result and less memory loss. The caps must be designed
> for flash app.
>
> 2) The tube heats and develops some resistance so you need to have enough
> time between flashes for them to cool down.
>
> I have designed my own circuit using high current SCR (this forces the
caps
> to fully discharge by providing a longer connection than the strobe) and
> parallel caps from disposable cameras and can now consistently get 12 -
18
> inch with #14 fender washers. And you can cycle them very fast (though
not
> recommended)
>
> Chris Gupta
>
>
> At 10:34 PM 8/19/98 -0400, Buhatarau@aol.com wrote:
> >Hi everyone,
> >I was wondering if anybody has experimented with Dr. Bob Beck's pulser
and
> Mr.
> >Thumpy. I have built both but have not attained the power that Dr. Beck
> >recommends. In his article, I think he stated that you should get
something
> >like twelve to fourteen inches of height out of a small washer. The
most
> >powerful pulser that I have built got only about five inches out of the
> washer
> >and the Mr. Thumpy only rattles the washer a slight bit. For the
pulser, I
> >used a very large AC professional photo flash with huge capacitors (old
> >though). For the Mr. Thumpy, I used a mini strobe from Parts Express.
On
> the
> >box, it said that it produces 20 watts at 15 flashes per second. Is
this too
> >weak to gain any benefit? The reason I bought this model is because
Parts
> >express has a sale this month. One for $20 and the second for $10. I
had
> >figured that this model would be at least as strong as the Radioshack
Party
> >strobe but maybe I was wrong. Thanks for any suggestions.
> >Mike Takaki
> >
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