Re: MOSFET Coil- Ready..Set...

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

Original poster: "S Gaeta by way of Terry Fritz <teslalist-at-qwest-dot-net>" <sgtporky-at-prodigy-dot-net>

Thanks Justin!

I have already purchased the MAX stuff, and the comparator. I have collected
a stock pile of '460s with heat sinks from junker power supplies.

How long of a streamer can I get out of this thing? in your article I see
that you mention only 5 inches, but on the list you said you got something
like 23 inches from one of your coils.
Is that from one of the other designs, or is it a later version of this one?

Cheers,
Sue

----- Original Message -----
From: "Tesla list" <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Sunday, April 06, 2003 11:43 PM
Subject: Re: MOSFET Coil- Ready..Set...


 > Original poster: "Justin Hays by way of Terry Fritz <teslalist-at-qwest-dot-net>"
<pyrotrons2000-at-yahoo-dot-com>
 >
 > Hi Sue and All,
 >
 > At first, I sampled my MAX913's and MAX4420's. It's a
 > no-questions-asked service from www.maxim-ic-dot-com, and is really
 > efficient at getting you to buy from them in the long run ; )
 >
 > You should only need one MAX913 to get the circuit up and running,
 > provided you include the diodes on the front-end. I have had one inch
 > streamers coming off the antenna when the SSTC runs ; ) I have never
 > killed the MAX913 when these diodes are present. The diodes are
 > simple germanium RF switching diodes - just about any germanium RF
 > diode will work here (ex. 1N60) but do not use silicon (ex. 1N4148 or
 > 1N914) diodes, or a zener.
 >
 > Beware of using a different part than MAX913. I chose it because this
 > part is highly stable in its linear region, unlike many other
 > comparators. You can use a different part here provided that:
 >
 > 1). It has an input impedance equal to or greater than the MAX913
 > 2). It is specifically stated in the datasheet that the part is
 > stable and free of oscillation when used with slow input waveforms.
 > 3). It is a single-supply comparator that will work with supply
 > voltage=5V.
 >
 > As several have correctly stated, any schmitt-trigger inverter will
 > work in place of the 74HC14. If you can find a direct replacement for
 > any part #'s on the schematic, I urge you to do so. Like MAX4420 =
 > TC4420, you can use them both. TC4420 is a better chip in my opinion
 > and it is cheaper; but if you are going to sample and/or purchase
 > from Maxim anyway, you might-as-well get the Maxim equivalent part
 > too. Both types work incredibly well.
 >
 > Indeed, our design is self adjusting and self-tuning. I've also found
 > it to be very well behaved. The schematic is up to date, and will
 > work if hooked up correctly. This is one of the few SSTC designs that
 > can work on a breadboard or perfboard ; )
 >
 > Sue, if you experience problems with the circuit or need more info,
 > feel free to email me personally.
 >
 > Take care,
 >
 > Justin Hays
 > KC5PNP
 > Email: justin-at-hvguy-dot-com
 > Website: www.hvguy-dot-com
 >