Scope of application 1. It is used as a PWM signal generator generates a square wave PWM use for experimental development; 2. Drives the stepping motor for generating a square wave drive signal; 3. For generating tunable pulsed power drive circuits; 4. Adjustable pulse generating control-related circuit. Brief Description: 1. The main chip: NE555; 2. Input voltage: 5V-12VDC. When 5V supply the output current can be at around 15mA; when the 12V supply the output current can be around 35mA. 3. The input current: >=100mA 4. The output amplitude:. 4.2V V-PP to 11.4V V-PP (different depending on the input voltage the output amplitude will be different) 5. The maximum output current: >=15mA (5V power supply V-PP greater than 50%) >=35mA (12V power supply V-PP greater than 50%) 6. The output duty cycle of 0-100% adjustable. About the size of the output frequency can be adjusted by changing the capacitance C46 PWM frequency default PWM frequency is about 6KHZ (2200PF capacitance). Big change the frequency decreases; piecemeal frequency increases. 7. PWM change their own examples: When 12VDC power supply C46: 0.47UF (0.22UF); R12: 10R; R2: 4.7K; R7: 1K.