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16 LED Reverse-Forward LED Chaser Circuit

Last Updated on February 22, 2025 by Admin Leave a Comment

In this really cool reverse forward LED chaser circuit concept we are essentially turning on and off a sequence of 16 LEDs one after another using a 24-pin decoder IC.

We are talking about the CMOS 4514 binary-to-decimal decoder here which is labeled as IC3. This IC uses a four-bit binary input to activate each of its 16 outputs in sequence.

How it Works

Now this binary input is provided by another IC, specifically the IC2 40193. This chip functions as a binary up/down counter capable of counting either forward or backward depending on how we set it up.

16 LED Reverse-Forward LED Chaser Circuit

We have also got an astable oscillator in the mix, formed by two gates (IC1c and IC1d) from our trusty quad NAND gate IC4011. The frequency of this oscillator is controlled by components C2 and R20—so we can tweak it to our liking.

Additionally two other gates (IC1-a and IC1-b) are configured as a set-reset flip-flop latching circuit. We use switches S1 and S2 to manage the start and stop functions respectively—it is pretty straightforward! Meanwhile, switch S3 controls whether our sequencing goes forward or backward.

So here is how it all works: when switch S1 is pressed then it starts the oscillator by setting pin 2 of IC1c high. This causes pin 10 of IC1a to latch high at the same time.

Simultaneously if switch S3 determines whether to count up or down then pin 14 of IC2's reset input goes low—it depends on how we position those switches!

As our clock runs smoothly along its merry way then LEDs from LED1 all the way through LED16 turn on one at a time in sequence—looking super slick if I do say so myself!

If they have been activated once (or deactivated if counting down) then once all these LEDs have been activated once (or deactivated), our LED chasing sequence simply restarts until stopped with switch S2!

Parts List

ComponentValue / Part NumberSpecificationsDescription
Resistors
R110K1/4W, 5% tolerancePull-down resistor
R210K1/4W, 5% tolerancePull-up resistor
R32.2K1/4W, 5% toleranceLED current limiter
R4 - R191K1/4W, 5% toleranceLED current limiters
R20100K1/4W, 5% toleranceTiming resistor
Capacitors
C10.02µF50V, CeramicDebouncing capacitor
C21µF16V, ElectrolyticTiming capacitor
C30.1µF50V, CeramicNoise filter capacitor
Semiconductors
IC14011Quad 2-input NAND gate, CMOSClock pulse generator
IC2401934-bit Up/Down Counter, CMOSControls counting direction
IC345144-to-16 Line Decoder, CMOSDrives the LEDs
Switches
S1Push Button (START)Normally Open (NO), MomentaryStart counting
S2Push Button (STOP)Normally Open (NO), MomentaryStop counting
S3DPDT Switch6-pin, On-OnForward/Reverse direction control
LEDs
LED1 - LED16Standard LED5mm, 20mA, Red/GreenChasing light display
Power Supply
-12V DC500mA minMain circuit power source

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About Admin

Hey friends, Thanks a bunch for stopping by this site! I am an engineer with a Bachelor of Engineering in Electronics and Telecommunication. One of my passions is gathering information from all sorts of electronics books and tutorials. I then take that information and compile it into a language that is super easy to understand. My goal is to make those complex electronics circuit concepts and technical terms much more accessible for all the new and budding electronics engineers out there. I can also design customized circuit diagrams as required by the users.
If you have any questions related to this field, please do not hesitate to drop a comment! I am always here and ready to help you out with any queries you might have. I cannot wait to hear from you!

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