Electromechanical Counter (CB21682E)

This photoelectric circuit from a 1960 publication uses a 6.3 V electromechanical counter, common at the time.

VCO 2 (CB9426E)
This voltage controlled oscillator, which can be used as a shield, generates signals in the 1.5...
FM Demodulator TBA120 (CB21885E)
This circuit was obtained from the 1976 Siemens integrated circuits manual. It is the circuit for...
5-Range Microammeter (CB25229E)
This instrumentation circuit was found in the September 1989 Radio Electronics magazine. The...