This amplifier circuit with two transistors was found in a Mullard transistor manual from 1960. The circuit has a maximum output current of 1.3 A.
We found this circuit in the 1982 SGS Linear Integrated Circuits Manual. Diode D1 prevents the...
This circuit is from an English publication from 1976 but can be easily assembled with BC548...
Because it uses TTL integrated circuits, this siren must be powered by 5 V or as indicated with D1 to...