Green Binary Counter

I have built a binary counter without using decoder. The diodes do the magic while the materials are: 1-7490 counter, 4-1N914 diodes, 1-555 timer, 2-4.7Kohm, 1-100uF capacitor, and 4-5mm LED's. Bill of Materials 1 IC74901 14-pin socket1 8-pin socket1 IC5551 PCB Jameco 1051004 5mm LED's any c...
By: braulio777

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