Plasma Lamp with Triac (CB26134E)

We found this circuit in a Radio Electronics Experimenter from 1990. The circuit uses a common incandescent bulb and a car ignition coil.

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Tone-Activated Relay (MIN038)
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60 Hz Passive Tunable Filter (CB13447E)
This circuit is from a 1975 amateur radio manual. The components can be approximated to the...
Low Frequency Doubler (CB11498E)
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