RE: SCR's

To: tesla-at-poodle.pupman-dot-com
Subject: RE: SCR's
From: Tesla List <tesla-at-stic-dot-net>
Date: Tue, 18 Mar 1997 00:30:04 -0600
Approved: tesla-at-stic-dot-net
Subject: 
     >    RE: SCR's

  Date: 
        Mon, 17 Mar 97 17:28:00 UT
  From: 
        "William Noble" <William_B_Noble-at-msn-dot-com>
    To: 
        "Tesla List" <tesla-at-pupman-dot-com>



 -----Original Message-----
From:   Tesla List 
Sent:   Sunday, March 16, 1997 7:18 PM
To:     tesla-at-poodle.pupman-dot-com
Subject:        Re: SCR's

Subject: 
        Re: SCR's
  Date: 
        Sat, 15 Mar 1997 12:37:33 -0700
  From: 
        "DR.RESONANCE" <DR.RESONANCE-at-next-wave-dot-net>

To:  Bill Noble

Noted your post on the SCR's and automotive ignition coils.  

The peak currents and nasty ringing seems to damage many solid state
device
when used with auto induction coils.  We have used these circuits also
but
always rate all devices for at least 5 times the expectly (or scoped)
peak
potentials and currents.  It may look strange to use hockey pucks in a
massive copper clamp with these devices but at least they never seem to 
fail.
[bill]  I never had that problem.  I use a standard 2 amp scr with a
simple 
snubber circuit, and a one shot for a trigger driver, 2 transistors to
drive 
the inverter (regenerative).  I have a schematic somewhere, but not here
with 
me in the middle east.  look at the schematic for a Delta mark 10 -
although I 
simplified their circuit quite a bit, it will give you the basic idea. 
I used 
a oil filled capacitor for the energy storage device, and I used 400 Hz 
aircraft transformer for the inverter transformer.  In over 10 years of 
operation I have had no failure.

[]  snip 

We are doing our first experiments on an common Accel "super coil" 
[bill]  I use standard stock coils - there is no need for a "super coil" 
unless you wish to throw money away.   Stock non-ballasted coils cost a
dollar 
or two at a wrecking yard.

Also noted the msn-dot-com post -- any chance you're from the Madison,
Wisconsin area??
[]  MSN = microsoft's network, I'm near Los Angeles

DR.RESONANCE-at-next-wave-dot-net