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Blinking Arrow

02-12-12

B

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Blinking Arrow

02-12-12

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Track or AC 16V Powered12v Power Supply

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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

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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.

A

red

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rro

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02-1

2-1

2

B

red

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Blin

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02-1

2-1

2

Track or AC 16V Powered12v Power Supply

Lennie Zink01-20-12

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