AC Switch with Triac (CB25855E)

The load controlled by this circuit depends on the triac used. The circuit is from Electronics Now magazine from June 1995.

Microphone Amplifier (CB24945E)
This PA or Public Address amplifier with a few watts of power was found in the March 1986 Radio...
IR tone remote control (CB20972E)
This circuit is from a Popular Electronics from the 90s. The circuit has a tone frequency...
Telephone Line Simulator for Internal Communication (CB18068E)
This circuit is a telephone line simulator and can be used for internal communications. It is...