High Stability Emitter Follower (CB25618E)

We found this high input impedance, low output impedance amplification stage in the October 1993 issue of Electronics Now.

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...