First Year Engineering Student – Just Built My First Significant Circuit 5

The circuit displays a continuous irregular repeating countdown; 4, 7, 2, 1, 4, 7, 2, 1, etc. It uses 3 J-K flip-flops, a decoder, a 7-segment LED display, and a few resistors. It is hooked up to a function generator that generates a 1 Hz pulse wave and a DC voltage source. I determined the proper J-K connections with Karnaugh mapping. 3 more years to go.



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5 Comments

  1. It was a love affair. Mainly Jesus and my first significant circuit.

  2. I believe I’d rather learn to solder than risk breadboard wires coming out

  3. 74LS series chips and a Jameco breadboard. That stuff must be 20 years old.

  4. something about 7 segment LED displays just feels like magic. when I was young, I had built all kinds of circuits but nothing made me feel like I had arrived more than making a 7 segment display actually display useful numbers

  5. I found that when I was breadboarding for lots of labs that having the 6 different color spools of wire kit that a lot of electronics eshops sell and a wire stripper was great for organizing circuits with a lot of connections like this.

    Being able to differentiate between power, ground, and different signal types at a glance helps a lot when the circuit doesn’t work how you expect.

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