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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Frequency ratio monitor (CB6999E)
Found in an Electronic Design from the 90s, this circuit produces a signal whose frequency is...
Telephone in Use Line Indicator (CB12177E)
We found this circuit in Popular Electronics from 1993. The circuit can be assembled with any...
Z80 Clock (CB6094E)
Found in an ancient American documentation, this circuit can generate signals up to 40 MHz for a...