Simple Oscillator schematic Basic Transistor Circuit Diagram
This circuit diagram shows a basic diagram of an oscillator that operates by using two transistors.
The resistor can be replace with 10k potentiometer. Increasing frequency on potentiometer can be used to drive buzzer or alarm speaker. While decreasing it’s frequency will be use to flash LED
The circuit will start to oscillate when a couple of passive component and two transistor connected as figure above