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The scope of application of this module:Used as a square wave signal generator to generate square wave signals for experimental development.Used to generate a square wave signal for driving a stepper motor driver.Generate adjustable pulses for MCU use.Generate adjustable pulses to control related circuits.Advantages and characteristics:The output is indicated by LED, and it is directly clear whether there is any output (LED quantity at low level, LED off at high level, LED blinking when the frequency is relatively low);The output frequency range is selectable, making the output frequency more continuously adjustable;Low frequency range: 1Hz～50HzIntermediate frequency range: 50Hz～1kHzMiddle and high frequency range: 1KHz～10kHzHigh frequency gear: 10kHz～200kHzThe output duty cycle can be fine-tuned. The duty cycle and frequency are not separately adjustable. Adjusting the duty cycle will change the frequencyThe output frequency is adjustable.Period T=0.7(RA+2RB)C.RA and RB are adjustable from 0-10K.C=0.001UF in low frequency range.C=0.1UF in the middle frequency range.Medium and high frequency gear C=1UF.C=100UF at high frequency, so the frequency of the waveform can be calculated by itself.Specification:Size:3.1cm*2.2cmMain chip:NE555Input voltage: 5V-15VDCInput current:≥100MAOutput amplitude:4.2V V-PP to 11.4V V-PPMaximum output current: ≥15MA