RE: MOSFET Coil- Ready..Set...

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

Original poster: "Mccauley, Daniel H by way of Terry Fritz <teslalist-at-qwest-dot-net>" <daniel.h.mccauley-at-lmco-dot-com>


Excellent Sue,

If you need any help let me know.  I can get you some large heatsink
extrusion if you need it.

Thanks

The Captain


 > 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
 >  >
 >
 >