Home | Components | 555 | Study | Books | Construction | Projects | Menu & Privacy

Electronics Club
electronicsclub.info

'Random' Flasher for 8 LEDs Project

Download PDF version of this page

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

Bitsbox
 
Fonehouse
 
  • 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



Menu

Top of page

Home

Downloads

Books

FAQ

Contact

Discounts

Links

Construction
 - Breadboard
 - Stripboard
 - PCB
 - Soldering
 - Tools
 - Workbench

Components
 - Capacitors
 - Connectors
 - Diodes
 - ICs ('Chips')
 - CMOS logic ICs
 - 74 series ICs
 - Lamps
 - LEDs
 - Relays
 - Resistors
 - Switches
 - Transistors
 - Variable Resistors
 - Others
 - Starter Kit

555 Timer IC

Study
 - Block Diagrams
 - Circuit Diagrams
 - Circuit Symbols
 - Electricity/Electron
 - Series & Parallel
 - Voltage & Current
 - Meters
 - Multimeters
 - Resistance
 - Ohm's Law
 - Power & Energy
 - AC & DC Signals
 - Oscilloscopes
 - Power Supplies
 - Transducers
 - Voltage Dividers
 - Transistor Circuits
 - Analogue & Digital
 - Logic Gates
 - Capacitance
 - Impedance
 - Counting
 - Quantities & Units
Projects
 - Dummy Alarm
 - Quiz
 - Traffic Light
 - Dice
 - Model Lighthouse
 - Simple Tester
 - Flashing LED
 - Electronic 'Lock'
 - Adjustable Timer
 - Light Alarm
 - Xmas Decoration
 - Railway Signal
 - Level Crossing
 - Lead Tester
 - 'Random' Flasher
 - Heart Badge
 - Valentine Heart

More Projects

Kits for Children


Privacy Policy & Cookies
This website does not collect any personal information unless you contact me by email. If you send me an email your email address and any other personal information you supply will be used only to respond to your message. Your personal information will not be given to any third party without your permission.
This website displays advertisements. If you click on these the advertiser may know you came from this site and I may be rewarded. No personal information is passed to advertisers.
This website does not use cookies.

© John Hewes 2015, electronicsclub.info (based in the UK)