3
Description:
This D.I.Y. package comes with all the components you need to assemble and solder a
running LED module. It has a double-sided board with surface mount and through-hole
configuration. It is designed for users with advanced soldering skills. You must solder some
components on the top surface and some components on the bottom side of the board. The
assembly process should take anywhere between 30 minutes to an hour.
The NE555 chip is designed to output a square wave signal based on the resistor values
of its voltage divider and the capacitor values. This essentially generates a clock signal which
turns the LEDs ON one after the other in sequence.
This module works with a supply voltage of 2.5 to 14.5 DC Volts. The NE555 astable timer
works in conjunction with 4 resistors (R1, R2, R3 and R4) and they charge the C1 capacitor. This
capacitor is discharged through R3 and R4. The oscillation is created at the output pin (pin 3) of
the NE555 chip as the C1 capacitor charges and discharges. This oscillated signal is provided to
the clock input (pin 14) of the CD4017 chip. This chip is a logic-based counter which provides 10
outputs to be used by the LEDs. The outputs pins are pin 1 to 7 and pin 9 to 11.
S
pecification:
Required Input Voltage: 2.5 to 14.5VDC
Circuit Board Size: 54mm x 20mm (2.13 in. x 0.79 in.)
IC Pinout:
The following figures indicate the pinout configuration for both ICs: