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'Random' Flasher for 8 LEDs Project

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Table showing 4026 outputs This project flashes eight LEDs in an apparently random manner. It uses a 4026 combined counter and display driver IC which is designed for driving 7-segment LED displays. The sequence is not really random because seven of the LEDs would normally be the display segments, the eighth LED is driven by an output that is normally used for driving further counters. The table below shows the sequence for the LEDs. You can use less than eight LEDs if you wish and the table may help you decide which ones to use for your purpose.


This project uses a 555 astable circuit to provide the clock pulses for the 4026 counter. Resistors are not required for the LEDs because the 4026 IC limits the current to about 5mA for each LED.


Parts Required

RSH Electronics
supply kits for all the projects on this website as well as tools and components.
Bitsbox
DVD Gold
  • resistors: 10k, 47k
  • capacitor: 1µF 16V radial
  • 3mm or 5mm LEDs ×8,
    they can be various colours
  • 555 timer IC
  • 4026 counter and display driver IC
  • DIL sockets for ICs: 8-pin, 16-pin
  • battery clip for 9V PP3
  • stripboard: 16 rows × 14 holes


Stripboard Layout

Stripboard layout for 'random' flasher


Circuit diagram

Circuit diagram for 'random' flasher


© John Hewes 2014, electronicsclub.info (based in the UK)
No part of this website may be reproduced in any way commercially without my prior permission.

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