Since I am not going to run the 3 rotor TC in a vehicle
I was thinking of using a cheap 110 volt to 220 volt AC transformer
and use a voltage doubler circuit to jack it up
440 volts DC for the capacitor discharge ignition I am designing for the
rotary.

Philippe-Pierre DEJEAN in France had a better idea.  Two transformers.

Thanks for suggesting this very simple and robust power supply Philippe.


The 500 volt supply is working great with a 40 watt load.

Next step is dump some 500 volt charged, 2 mF capacitors into a 2nd gen
waste spark coil primary.

One such coil for each rotor.

Paul Lamar


Hi Paul
In the wiring diagram I think the cathode of D3 should go to the anode of D1

Bill McDonald

Thanks Bill. I think your right. I am probably losing some DC voltage.
I'll check it tomorrow.

Paul Lamar

The voltage went up to 565 with 4 volts ripple peak to peak.
Here is the corrected diagram.

Paul Lamar


This is the hall effect ignition sensor holder on the nose of the e-shaft.
The green part is 2" wide 1/4 inch thick steel bar bolted to
the large bolts on the side of the front cover normally used
to bolt the air conditioning compressor. Stiffness is everything
when it comes to ignition sensors and steel is three times
stiffer than aluminum.

The screen shot should be printed to the correct size and
used as a pattern to cut the red plastic hall effect sensor holder.
The slots allow timing adjustments. The bolts are 1/4 inch.

I ordered 1/4 inch thick Bakelite from Mcmaster which is strong
and stiff and is a good insulator for the three hall effect wires.

For a 12 by 12 chunk it was $12.


BTW these hall effect sensors do not require motion to work.
They will therefor work down to zero RPM for hand propping.

Paul Lamar