Balanced Modulator MC1594 (CB14588E)

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

AC Voltage Follower 741 (CB25792E)
This circuit was found in the January 1995 Electronics Now magazine. Its configuration is valid for...
Multistage Amplifier (CB22535E)
This circuit with transistors in parallel was found in a Radio Electronics of August 1952....
TRIAC Shot By Reed Relay 2 (CIR3265E)
We find this simple circuit in an English publication called Electronic Circuit Design no. 3 of...