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Picture Index |
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 Of significance here are the three green LEDs. They make up the first 3 columns of the first row. The white wires are from the parallel port, which connect to a resistor, which feed into the 74HCT04, which is an inverter circuit. This flips the value of the signal (which requires the software to output the inverse of what I actually want), but it also amplifies the signal and provides a clean signal for the next stage of the circuit.
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