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Re: SCR's



Subject: 
           Re: SCR's
      Date: 
           Wed, 19 Mar 1997 20:15:40 -0800
      From: 
           Ed Phillips <evp-at-pacbell-dot-net>
  Reply-To: 
           ed-at-alumni.caltech.edu
        To: 
           Tesla List <tesla-at-stic-dot-net>
       CC: 
           Ed Phillips <ed-at-alumni.caltech.edu>
References: 
           1


The attached uuencode GIF file is the schematic of the SCR driver
I am using for GM high energy ignition coils, of the type obtainable
at any auto junk yard for about $5.00 each.  (At least here in
the LA area).  They are in the distributor caps of Olds, Buick,
and Cadillac V-8's (at least) for the years around 1990.
        Please note that you have to dope out the connections to the
coil
yourself, which isn't too hard.  The HV connection is obvious,
being the metal plate in the side of the windings.  The other windings
must be checked out with the ohmmeter.  Note that the low-voltage
end of the secondary should be connected to one side of the primary,
or at least not allowed to get more than a few hundred volts away from
it, 
otherwise a primary-secondary short will occur.
        Using this circuit I can easily arc over the coil in air.  I
normally
mount them under oil (refrigerator jar) and don't try for over
about 3" sparks, although the coil will put out more.
        The 300 volt power supply is a voltage doubler working off the
115 volt line, with about 80 ufd capacitors.  The pot adjust the
repetition rate, and hence the line current and the power dissipation
in the device.  The repetition rate increases as the pot is set to the
high voltage end (it won't start oscillating until the pot voltage
is around 50).  I put a DC milliameter in series with the power
supply, and make sure I never run much over 100 mils, in order
to keep the power down.
        If anyone is interested will publish the voltage doubler circuit
too.
        If you try this please let me know results, which are not
guaranteed!
Ed Phillips


BEGIN --------- cut here --------- CUT HERE -------- PART 1/1
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end
END ----------- cut here --------- CUT HERE -------- PART 1/1