Functional 1. The output side outputs a square wave signal after power is applied, and the amplitude is approximately equal to the power supply voltage. 2. The output frequency is adjustable, and the output voltage is stable during the frequency adjustment. 3 adjustable frequency range, 20HZ-10KHZ according to the need to choose (frequency allows 10% deviation), if you need special frequency need to replace the C1 capacitor. 4. The frequency adjustment is adjusted by the built-in multi-turn potentiometer. 5. Power supply: The power supply voltage is DC 5V-15V and the no-load current is about 3mA. 6. Output drive current: 200mA MAX. 7. Purpose: Use as a signal source in the circuit. Instructions: 1. Connect to the power supply to work. 2. When used, a 0.1uf power filter capacitor can be connected to the power supply for stable operation. 3. Adjust the potentiometer clockwise, increase the frequency, and adjust the potentiometer counterclockwise to decrease the frequency.