20Pcs NE555 Pulse Frequency Duty Cycle Adjustable Module Square Wave Signal Generator

20Pcs NE555 Pulse Frequency Duty Cycle Adjustable Module Square Wave Signal GeneratorFeatures:1. As a square wave signal generator,generates a square wave signal used for experimental development.2. Used to drive a stepper motor for generating a square wave drive signal.3. Generate adjustable pulse for MCU.4. Generate adjustable pulse,to control circuitry associated.5. Size: 31mm x 22mm6. Main chip: NE5557. Input Voltage: 5V-15V DC. When power supply is 5 V , the output current can be 15 MA around; when 12V power supply, the output current can 35 MA around8. Input current: >=100 MA9. Output amplitude: 4.2V V-PP to 11.4V V-PP. (Different input voltage, the output amplitude will be different)10. Maximum output current: >=15MA (5V power supply, V-PP greater than 50%), >=35MA (12V power supply, V-PP greater than 50%)11. Output with LED indication(low level ,LED will on; high level,LED will off;low frequency, the LED flashes)12. The output frequency range is selectable:LF file: 1Hz ~ 50Hz &