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.
Found in a 1969 EDN, this circuit uses components from that time. Modern equivalent transistors can be...
This amplifier with old germanium transistors is from a 1957 documentation. The power is a few...
We found this circuit in an American documentation from the 90s. The circuit combines functions of 4...