10-Step Sine Generator (CB24472E)

This CMOS generator with the 4018 IC was found in a November 1976 Radio Electronics magazine. It uses a 741 op-amp as the audio amplifier.

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Headphone amplifier (CB23888E)
This headphone amplifier using a pickup coil can be used as an extension for devices such as TVs,...
Water Pump Control (CB18770E)
This circuit uses common components activating a control relay for the water pumps. The sensors are...
Locked solenoid driver (CB7232E)
We found this circuit in a 1967 El3ectronics World. The transistors are from the era but can be...