Application:
1. Used as a square wave signal generator to produce square wave signals for experimental development.
2. Used to generate a square wave signal to drive a stepper motor driver.
3. Generates adjustable pulses for use by the MCU.
4. Generate adjustable pulses to control related circuits.

Specification:
Size: 31*22mm, Weight: 7g
Main Chip: NE555
Input voltage: 5V-15VDC
When power supply is 5V, the output current can be 15 MA around.
When power supply is 12V, the output current can 35MA around.
Input current:> = 100MA
Output amplitude: 4.2V V - PP to 11.4V V - PP (Different input voltage, the output amplitude will be different)
Max output current: ≥ 15MA (5V power supply, V-PP greater than 50%), ≥ 35MA (12V power supply, V-PP greater than 50%).

Feature:
1. High level, LED will off. Low frequency, the LED flashes.
2. Output frequency range can be selected, so that the output frequency is more continuously adjustable.
-Low frequency: 1Hz～ 50Hz
-Medium frequency: 50Hz～1kHz
-Medium-high frequency: 1KHz～10kHz
-High frequency: 10kHz～200kHz
3. Output duty cycle can be fine-tuned, duty cycle and frequency are not separately adjustable, adjust the duty cycle will change the frequency.
4. The output frequency is adjustable
Cyclical T=0.7(RA+2RB)C
RA, RB is 0-10K adjustable
-Low frequency: C=0.001UF
-Medium frequency: C=0.1UF
-Medium-high frequency: C=1UF
-High frequency: C=100UF
So the frequency of the waveform can calculate by buyer.