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Transistor Based Level Shifter

One of the simplest designs I’ve found for level shifting is just tying 2 NOT gates together. The nice thing about a NOT gate is it can be made with a single transistor, which means we can make a level

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Large LED Matrix Display – Part 1

I’ve wanted a digital marquee for a long time. The kind you see at some gas stations or grocery stores that say simple messages like “Have a nice day!”. They tend to be pretty expensive for something pretty small. I

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