Re: _CD Ignition_

    Good morning Kevin.

Don't think an alternator is needed to power a properly designed CD Ignition system. Attached is a complete
CD Ignition system for reference, including construction and parts info. It is a DC to DC Inverter type circuit.
This circuit claims EMI noise is filtered, which is helpful for the aircraft power bus, especially if running sensitive
electronic devices.
The battery supply is stepped up to 300 Vdc through a multi vibrator stage using a transformer and the charge is stored in a 275 Vac capacitor and then dumped to the coil(s) by mosfet switches in half bridge configuration. Lots of testing would be needed to confirm reliability.

    Hope this info helps move forward the rotary engine ignition system.

George M


I have one of those George. I fooled with it for many hours.
It worked for awhile. It was unreliable.
The switching power supply experts say not to use push pull primary circuits as
a slight unbalance in the transformer cause them to fail. Or something to that effect.

It is also a real old chip and newer chips are better.

Paul Lamar

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