Nite Rider Lights

Paul Hill   hillpa@ntlworld.com     

344 

Nite_Rider_th

Description

The circuit is drawn with PCB 123 which you can download for free from http://www.pcb123.com

As a keen cyclist I am always looking for ways to be seen at night. I wanted something that was a novelty and would catch the motorists eye. So looking around at my fellow cyclists rear lights, I came up with the idea of ‘NITE-RIDER’. NINE extra bright LED’s running from left to right and right to left continuously. It could be constructed with red LEDs for use on the rear of the bike or white LED’s for an extra eye catcher on the front of the bike.

All IC’s are CMOS devices so that a 9V PP3 battery can be used, and the current drawn is very low so that it will last as long as possible.

Parts

Part Quantity Value
IC4 1 555 timer
IC1 1 4027 flip flop
IC2,IC3 2 4017 Decade Counter
IC5, IC6, IC7 3 4071 OR gate
R3 1 470 Ohm resistor 1/4 watt
R1, R2 2 10K resistors 1/4 watt
C1 1 6.8UF Capasitor 16V
LED1-LED9 9 Super brght LED’s
Battery 1 9V PP3 Battery
SW1 1 single pole switch

How it works

IC4, C1, R1 and R2 are used for the clock pulse which is fed to both the counters IC2 and IC3 Pin 14.

IC1 is a Flip Flop and is used as a switch to enable ether IC2 or IC3 at pin 13.

IC7a detects when ether IC2 or IC3 has reached Q9 of the counter pin 11.

IC5, IC6 and IC7a protects the outputs of the counters IC2 and IC3 using OR gates which is then fed to the Anodes of the LED’s 1 to 9.

 

Leave a Reply

Your email address will not be published. Required fields are marked *

You may use these HTML tags and attributes: <a href="" title=""> <abbr title=""> <acronym title=""> <b> <blockquote cite=""> <cite> <code> <del datetime=""> <em> <i> <q cite=""> <s> <strike> <strong>