Nite Rider Lights
Paul Hill - hillpantlworld.com
The circuit is drawn with PCB 123 which you can
download for free from
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
The circuit comprises of ...
1 555 timer IC4.
1 4027 flip flop IC1.
2 4017 Decade Counter IC2 and IC3.
3 4071 OR gate IC5, IC6 and IC7.
1 470 Ohm resistor 1/4 watt R3.
2 10K resistors 1/4 watt R1 and R2.
1 6.8UF Capasitor 16V C1.
9 Super brght LED's 1 to 9.
1 9V PP3 Battery.
1 single pole switch SW1.
How The Circuit 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
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.
Download schematic in PCB123 format
17 Hardwick Close