✍ Feature
This is a NE555 timer module that generates pulse wave which is suitable to use as an external clock for FPGA or control the LED brightness. The changeable duty cycle is ranging from 50% to 100%.

Note: There are four different frequency ranges to be selected by moving the jumper.

▼ Features:
1. As a square wave signal generator 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

▼ Specifications
Chipset: NE555
Operating voltage: 5 ~ 15 VDC
5V output current 15mA±
12V output current 35mA±
(V-PP greater than 50%)
Input current: > 100 mA
Resistance (R1-adjustable near IC): 0 ~ 10 Kohm (Duty cycle)
Resistance (R2-adjustable): 0 ~ 10 Kohm (Frequency)
Adjustable duty cycle: 50 ~ 100%
Selectable frequency:
1 Hz to 50 Hz (L, C=100uF)
50 Hz to 1 kHz (ML, C=1uF)
1 kHz to 10 kHz (MML, C=0.1uF)
10 kHz to 200 kHz (H, C=0.001uF)
Output amplitude: 4.2V V-PP to 11.4V V-PP. (Different input voltage, the output amplitude will be different)
Dimension: 31 x 17mm
Weight: 8g

LED indication:
Low level LED will on
High level LED will off
Low frequency LED flashing

▼ Package content
1x Clock pulse module NE555