The purpose of this circuit is to silence the hiss that exists between the stations on an FM receiver. The circuit was found in American documentation from the 1980s.
This circuit is from a documentation from the 90s. The transistor can be any general-purpose FET...
Found in an Elektor from the 90's, this double door-bell drive circuit switches a relay by...
Using a CA3130, this circuit generates signals from approximately 550 kHz to 1.6 MHz using a...