Dual Sensor (CB21521E)

This circuit, with two operationals, was obtained from an old American publication. Operational amplifiers can be of modern equivalent types.

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Audio Oscillator (CB457)
Hartley oscillator operates in the audio range. Frequency can be adjusted by P1 and also depends...
Electronic Compass (CB25382E)
This circuit was found in the June 1991 issue of Radio Electronics magazine. The circuit uses two...
60 Hz Suppressor (CB6738E)
This filter is intended for 60 Hz noise suppression in amplifiers. We found it in American...