Suitable for clandestine listening and in SMD assembly, this circuit was found in the Radio Eletronics magazine of August 1988. The listening is in headphones and the amplifier is electret.
This circuit was found in a 1962 publication. At the time there were high voltage batteries like the...
Suggested by Sprague in the 1980s documentation, this circuit can control three-phase AC motors....
This circuit divides the frequency of a 2 kHz signal by 2. The circuit was found in Philips...