Features 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 50HzIF file 50Hz 1kHzHigh frequency file 1KHz 10kHzHF file 10kHz 200kHz13 The output duty cycle can fine tune duty cycle and frequency is not separately adjustable adjusting the duty cycle will change the frequencyPackage included 1 x NE555 Pulse Frequency Duty Cycle Adjustable Module