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Original poster: "Mark Dunn" <mdunn@xxxxxxxxxxxx>
All SISG followers:
Finally got the scope back.
Recall that I was previously getting 1000 BPS with the SISG.
Subsequently, I had managed to increase the transformer(4 MOTs)
impedence(primary side) from ~1.7 ohms to ~8 ohms by re-shunting. In
addition, I doubled the tank capacitance from 38 to 76 nF. Both had a
significant effect judged by sound and performance.
The new waveforms are shown here:
Now getting 120 BPS which means I am firing near each charging peak.
Using (4) SISG boards or (12) circuits for a threshold 10.8 kV.
Using 680 ohm IGBT timing resistor to get the IGBT "on" time down.
Input VA ~1500
Transformer VA ~1200
Power ~800 watts
Haven't had time to re-tune accurately, but coil runs great anyway.
Need to install a vent fan for the ozone in the basement.