Balanced Modulator MC1594 (CB14588E)

This circuit is from the Motorola Linear Databook from 1990. The integrated circuit used is uncommon today.

Optical switch with LDR and SCR (CB23964E)
We found this circuit in the July 1969 Radio Electronics magazine. The circuit uses a coupler made...
Emergency Light (CB1561E)
With the configuration shown in the figure, a common 12 V lamp lights up when light no longer...
Pierce Oscillator (CB12686E)
This oscillator has its frequency controlled by crystal and its frequency can be between 100 kHz...