42 kHz oscillator (CB21805E)

This circuit was used as an eraser for old tape recorders. The circuit is from a 1960 Mullard transistor manual.

Capacitance Bridge (CB10666E)
This circuit is from a Popular Electronics from July 1990. The magazine no longer exists, but the...
High Q Active Notch Filter MC34071 (CB15281E)
Other operational amplifiers series, such as MC34072, MC34074, MC35071, MC35072, MC35074 d MC33071...
Inverting CMOS Amplifier (CB25577E)
This gain 10 CMOS op amp was found in the May 1993 issue of Electronics Now magazine. It is...