This additional bell circuit was found in the February 1994 Electronics Now magazine. The transistors are common, and the circuit is for analog lines.
The original purpose of this 1963’ circuit from a magazine is to replace the mechanical vibrators used...
Using germanium transistors, this amplifier provides a 540mW output power when powered by 9V. We...
This high stability circuit was found in old documentation. The operational can be a modern...