Sequential Brake/Turn Lights

Bar-mode LED-cluster sequencer

Can drive up to 16 clusters

Circuit diagram:

Sequential Brake/Turn Lights


R1,R5____________1K  1/4W Resistors
R2______________33K  1/4W Resistor
R3_____________100K  1/2W Trimmer Cermet
R4_______________1M  1/4W Resistor
R6,R7,R8________10K  1/4W Resistors
R9_______________4K7 1/4W Resistor
R10_____________33R  1/4W Resistor (See Notes)

C1_______________1µF  63V Polyester Capacitor
C2_____________100nF  63V Polyester Capacitor
C3_____________470µF  25V Electrolytic Capacitor

D1______________LED (Any dimension, shape or color)
D2,D3________1N4002  100V 1A Diodes
D4--D15________LEDs   High brightness, high efficiency red types (See Notes)

Q1___________2N3819   General-purpose N-Channel FET
Q2____________BC337   45V 800mA NPN Transistor
Q3____________BC547   45V 100mA NPN Transistor

IC1____________7555 or TS555CN CMos Timer IC
IC2,IC3________4094  8-stage shift-and-store bus register IC

SW1____________SPST  Brake/Turn Lights Switch


This circuit, designed on request, allows up to 16 LED clusters illuminate in bar-mode sequence. LED sequencing will start when the Brake pedal is pressed (or Turn Lights are switched-on) and, when the last cluster illuminates, all LED clusters will remain steady on until the Brake pedal is released or Turn Lights are switched-off.