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Re: Sam's High-Energy Double Car Ignition Coil Driver... Update
Hi Sam, All,
I use a 0.33uF capacitor in series with a 10 Ohm non inductive
power resistor. I put this in parallel with my SCR. I also put a
stack of about 20 1n4007 in parallel, antiparallel to the SCR. The RC
network eats the hf that would destroy the diode and SCR. The diodes
protect the SCR from reverse voltage. They also provide energy
savings by recharging the main capacitor with the charge left overs
not eaten by the secondary. These values have been arrived at by many
expensive trials.
My SCR pulser uses an scr with no writing on it from the ham fest.
I bought 2 SCR's and used the second one to find the voltage breakdown
limit. I tried several different diodes across the SCR to protect it
from reverse voltages when the arc on the secondary of the ignition
coil connects. The RC snubber network was calculated and tweaked from
the General Electric SCR manual. My main capacitor is 10 uF. The
power supply is 600 Volts at about 1 Ampere. With dual cored ignition
coils at about a few hundred Hz it gives a 6 inch arc in air. The arc
is similar to that of a potential transformer. The noise is
deafening. The coils soften after about 15 minutes. The SCR is cold
to the touch. The 1n4007 diodes are also cool to the touch. The
snubber resistor is a bit toasty but not too bad.
I have never discussed this circuit or my apparatus before because
it is VERY DANGEROUS. The output is pulsed DC. Very Very Dangerous
and extremely painful as well ,if you live.
Barry
HAPPY NEW YEAR+ACEAIQAh-
Making sparks with alternative power sources
Sam Barros.