Low Frequency Doubler MC1556G (CB14564E)

This circuit is from Motorola's 1990 Linear Databook. The circuit employs a component that is no longer common today.

MOSFET Proximity Relay (CB13319E)
This circuit was found in a 1976 documentation. We can assemble it with equivalent transistors, for...
Modulated Siren 4001 (CB24354E)
This modulated siren was found in the December 1974 issue of Radio Electronics magazine. A higher...
Zero Crossing Detector LM3900 (CB15261E)
Other amplifiers of the series like the MC3301, MC3401 and LM2900 can be used in this circuit. We found...