Originally posted by Lidmotor
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In regards to your fan going solid state. The ignition coil is a lower resistance path to the collector from the input. If you are using the fan to generate the oscillations for your light then your fan could stop but your coils inside your fan can oscillate still. You can do this with the SG circuit simply by raising the base resistance.
Many thanks Agongon and Ren for helping me to understand enough to get it built on a bread board and get it working. Facinating little device. I learned alot doing this build. Wish that I had a scope so I could see the wave forms.
Here is the video of it working amongst a big pile of parts on my table.

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