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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Light Controlled Amplifier (CB24002E)
The gain of this amplifier is controlled by light shining on an LDR. The circuit is from a Radio...
Variable Sound Effect (CB15048E)
This circuit produces a whistle sound when acting on switch S1. Aids is applied to a transformer that is...
Twin-T Rejector Filter 741 (CB25603E)
This filter that rejects a frequency range determined by the double-T was found in the August 1993...