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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Power grid Interference Filter (CB6737E)
Found in a 1968 US publication, this circuit can operate on any power grid. The thickness of the wire...
120-second timer 555 (CB25500E)
In the figure we have a simple timer with the 555 feeding a relay directly. The circuit is from...
Electroscope (CB16228E)
A simple electroscope can be made only with a 741, without the need for field effect transistors or other...