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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Constant torque control (CB7936E)
Found in an American publication from 1968, this circuit aims to keep the torque of a DC motor...
Optical Coupler Shield - II (CB1326E)
This shield can be used both to interface microcontroller circuits or TTTL. The resistor in series...
Water level control (CB6949E)
Found in Popular Electronics this circuit uses current components to control a pump in order to...