Magnetic Sensor Amplifier (CB6494E)

This circuit was obtained from a Philips documentation from 1970. It can be built on modern operational amplifiers.

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Simple 60 Second Timer (CB12419E)
This timer was found in a 1994 Electronics Now. The relay must be a sensitive type. If it has a...
Oscillator with Relay (CB19779E)
We can make an oscillating relay producing a rectangular signal taking advantage of the inductance of...
White Noise Generator (CB17603E)
This circuit appears at various points in this section and on this site, with minor variations. It uses the...