Ion generator (CB7837E)

This negative ion generator was found in a 90s Popular Electronics. The autotransformer can be an automobile ignition coil.

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Power indicator (CB7255E)
Indicated by Popular Electronics to be used with a car headlight, this circuit can also have...
1 000 Hz Colpitts Oscillator (CB3922E)
In this circuit of a 1970s publication, data from the coil to oscillate at the desired frequency...
Comparator with Transistors (CB6550E)
This circuit was obtained from a Philips documentation from 1968. The transistors can be replaced...