Indicated for activation by microcontrollers, this circuit was found in the Radio Electronics magazine of December 1987. The MOSFET can be of any type according to the buzzer.
This circuit appears elsewhere in this section, but taken from other sources. This is an English...
Found in a 1975 radio amateur publication, this simple oscillator is for code practice. The PNP...
This circuit for some amps was found in a 90s Radio Electronics. The voltage can be between 6 and 25 V...