Simple Siren using 2N2907 Transistor
This be Simple Siren Circuit that build easily. Because of use the transistor 2 pcs only just. Can use 8 ohm size loudspeakers. Which , I uses old loudspeaker , at the sound doesn’t Amen! come to usable with this comfortable circuit. The usability just you presses switch (close) S1 a loudspeaker will utter. Enhance the frequency goes up (C1 , loaded ). When liberate Switch(Open)S1. [...]
Source: Simple Siren using 2N2907 Transistor
