Bar-mode Lights Sequencer

Can drive up to 15 LEDs or LED-clusters

Selectable Bar-length

Circuit diagram:

Bar-mode Lights Sequencer


R1,R5,R9_________1K  1/4W Resistors
R2______________33K  1/4W Resistor
R3_____________100K  1/2W Trimmer Cermet
R4_______________1M  1/4W Resistor
R6,R10__________10K  1/4W Resistors
R7,R8___________22K  1/4W Resistors
R11______________4K7 1/4W Resistor
R12_____________33R  1/4W Resistor (See Notes)

C1______________10µF  25V Electrolytic Capacitor
C2_____________100nF  63V Polyester Capacitor
C3_____________470µF  25V Electrolytic Capacitor

D1--D14________LEDs   (See Notes)

Q1___________2N3819   General-purpose N-Channel FET
Q2,Q3,Q5______BC547   45V 100mA NPN Transistors
Q4____________BC337   45V 800mA NPN Transistor

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


This circuit, designed on request, allows up to 15 LED clusters to illuminate in bar-mode sequence. LED sequencing will start at power-on and, after reaching the desired output, all the LEDs turn off and sequence restarts.
The number of LEDs or clusters forming the bar can be selected by connecting R7 to the appropriate output pin of IC2 or IC3.