This nonlinear gain circuit was found in a 1965 Electronic Design. The configuration can be used as a basis for modern designs with equivalent transistors.
Found in an English documentation, this siren of good power is indicated for several applications, based on...
The circuit used is the 4093 configured as an inverter in this application from Radio Electronics from...
This circuit is from an Italian magazine Elettronica 2000 of September 1987. It is a pulsator for...