Rail to Rail Oscillator 555 (CB9099E)

Found in an Electronic Design from the 80s, this circuit generates a 500 Hz signal and can be used as a shield

Proximity Relay (CB25343E)
This proximity relay circuit was found in the July 1990 Radio Electronics magazine. The supply...
Pulse Width Modulator (CB5364E)
This circuit is from an old operational amplifiers manual. However, the setting applies to modern...
Sine to square converter CA3140 (CB24971E)
Using an operational amplifier, the figure shows how to convert the waveform to low frequency...