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Re: MOSFET Coil- Ready..Set...
Original poster: "S Gaeta by way of Terry Fritz <teslalist-at-qwest-dot-net>" <sgtporky-at-prodigy-dot-net>
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?
----- Original Message -----
From: "Tesla list" <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>"
> 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
> 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
> Email: justin-at-hvguy-dot-com
> Website: www.hvguy-dot-com