Auto Lighting | Electronic Project Circuits

Posts Tagged ‘auto lighting’

Headlight Flasher

This circuit was requested from an email. It will allow your car headlights to flash on and off at the same time or it will cause them to flash alternately. The circuit is based on the 555 timer or LM7555 timer. It is used in the astable mode.

The 555 timer output will go high for an adjustable period of time and then turn off.
It will then repeat the procedure. The time is adjusted by R1.

To hook up the circuit to your car you must locate the positive wire from the fuse box to the headlights.
Cut the wire and insert the relay contact and bypass switch.
The bypass switch will allow you to bypass the relay contact for normal headlight operation.
In the alternating headlight configuration you must
cut the positive wire to each headlight and wire in the relay contact.

From :: http://home.maine.rr.com/randylinscott/sep98.htm

Be the first to comment - What do you think? Posted by admin - April 28, 2007 at 10:57 am

Categories: Basic electronics, Lighting Tags: 555 led flasher circuit, auto lighting, headlight flasher

Nite Rider Lights

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.

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.
1 Box.

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 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.
Information about LM4017