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A
redcircuits.com
Blinking Arrow
02-12-12
B
redcircuits.com
Blinking Arrow
02-12-12
Blinking Arrowredcircuits.com
Lennie Zink02-13-12
Track or AC 16V Powered12v Power Supply
Lennie Zink01-20-12
A2A1 A3 A4 Com
B2B1 B3
B2B1 B3 B4 Com
R2 Rate330K
IC1 IC3
B
C
E
R310K
R44.7K
R64.7K
R84.7K
R510K
R710K
R104.7K
R910K
R124.7K
R1110K
Q1 Q2 Q3 Q4 Q5B
C
E
B
C
E
B
C
E
B
C
E
IC2
C14µ7
A1 A3 A4A2 B4R11 R12 R13 R14 R15
A&B Comm
http://www.eleccircuit.com/led-light-running-arrows-showing-the-position/
IC2____________4520 Dual binary up-counter IC
17 LEDs in four groups bar-mode sequence
Obviously, many different arrangements using more or less LEDs are possible.
R11,R12,R13____470R 1/4W Resistors (New Value)
Suitable for shop-windows animation etc.
A blinking arrow can be a very attractive gadget, suitable for many indication purposes. This circuit provides a bar-mode sequencer driving 17 LEDs arranged in four groups in order to build-up a bright arrow. When the build-up of the arrow is completed, all LEDs stay on for some time, then off for the same time-delay and then the cycle restarts. Sequence speed can be set by R1.
The resulting effect of the original four groups of 17 LEDs arrangement is shown in the title heading.
Q1,Q2,Q3,Q4___BC337 45V 800mA NPN Transistor (Q5 Added)
Notes:
C2_____________220µF 25V Electrolytic Capacitor (Not Used)
Please note that the unused section of IC1 must have the inputs tied to negative ground whereas the output must be left open, as shown at the bottom of the diagram.
R3,R5,R7,R9_____10K 1/4W ResistorsR4,R6,R8,R10_____4K7 1/4W Resistors
Blinking Arrow
D1--D17________LEDs Any type and color (except blue and white, see Notes)
R1_____________500K 1/2W Trimmer (Not Used)Parts:
http://www.redcircuits.com/Page107.htm
R2______________22K 1/4W Resistor (330k Rate)
C1_______________4µ7 25V Electrolytic CapacitorR14____________270R 1/4W Resistor (New Value)
IC1____________4093 Quad 2 input Schmitt NAND Gate IC
IC3____________4094 8-stage shift-and-store bus register IC
Comments:
For those wishing to experiment, sequence timings can also be varied by connecting pin #5 of IC1B to pin #5 of IC2 and pins #6, 8 and 9 of IC1 to pin #6 of IC2. Other pin combinations are possible by shifting the above named pins of IC1 to higher outputs of the counters contained in IC2, i.e. pins #6 and 11, pins #11 and 12 etc.
At 12V supply the maximum number of LEDs per strip is that shown in the circuit diagram, when red LED types are used. Yellow, green and orange types may require a lower value of the limiting resistors or a lesser number of devices per strip.
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Track or AC 16V Powered12v Power Supply
Lennie Zink01-20-12
Blinking Arrowredcircuits.com
Lennie Zink02-13-12