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. With LED indicator, whether there is output is directly clear (LED on when low level, LED off when high level, LED flashing when frequency is relatively low)
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.