Obtained from an Electronic Engineering of the 90s, these circuits can be applied to almost any operational amplifier. Signal shapes are given next to the diagram.
This circuit was found in a Radio Electronics of August 1952. The transistors are germanium types...
The purpose of this circuit is to add millivolt scales to a common multimeter. Used transistors are...
Found in an English documentation, this siren of good power is indicated for several applications, based on...