Found in American documentation from the 1980s, this circuit can be designed with equivalent components. The microphone can be of the piezoelectric type.
This circuit was found in an American documentation from the 90's. The circuit is intended for...
This circuit can reduce the voltage of a source by providing regulated adjustable output. The...
Found in a 90s Popular Electronics, it serves both TTL and CMOS logic. The injector can provide 10...