NE555 Pulse Frequency Duty Cycle Adjustable Module Square Wave Signal Generator

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～50Hz
Intermediate frequency range: 50Hz～1kHz
Middle and high frequency range: 1KHz～10kHz
High frequency gear: 10kHz～200kHz
The output duty cycle can be fine-tuned. The duty cycle and frequency are not separately adjustable. Adjusting the duty cycle will change the frequency
The 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*2.2cm
Main chip:NE555
Input voltage: 5V-15VDC
Input current:≥100MA
Output amplitude:4.2V V-PP to 11.4V V-PP
Maximum output current: ≥15MA