Knight Rider Lights

Posted on Feb 15, 2013

The 555 timer IC is connected for Astable Operation, the clock pulses are fed to the 4017 IC via the 10K resistor. The 4017 is a 10 stage counter, each of the outputs is connected to the appropriate LED, as some LEDs need to be on for more than one count, we use diodes to avoid a short circuit situation between outputs. The capacitor and resistor on pin 15 of the 4017 are used to reset the counter to zero at initial power up. The ULN2001N used on the bulb version is a seven channel Darlington Driver IC, a small signal on one of the inputs is enough to drive the bulb on the output.

Knight Rider Lights
Click here to download the full size of the above Circuit.
Knight Rider Lights - image 1
Click here to download the full size of the above Image.

You can use 12V bulbs for the output, simply substitute the IC for the LEDs, the bulbs are then connected to the IC's outputs. This set up is ideal for running off a car battery.

Leave Comment

characters left:

New Circuits



Popular Circuits

CSC400-Circuit Design
schematic diagram
car sound generator schematic
max2338 hp at the sound amplifier
FX803 Signalling Processor
Polaris Jet Ski Model SLTX 1050
MFOS Ten Step Analog Sequencer
555 Touch-sensitive switch circuit diagram