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Improved XNOR gate

A project log for Light Logic - Diode Resistor Logic out of its cage

Out of its cage and set free !

Dr. CockroachDr. Cockroach 12/28/2021 at 14:102 Comments

December 28, 2021 - After a bit of an absence I started improving on some of my Light Logic gate circuits. I was never satisfied with how my XNOR gate turned out so I ended up having a dream last night and when I woke up this morning I got to working on what I had dreamed about. The simple change is that I now feed 5 volts to the inputs continuously through a pair of 150R resistors. If there is no input at either A or B then the input is considered HIGH. If either A or B is grounded through a previous gate then the input is LOW. The Out of the LDR can be followed by a Light Logic Inverter gate to create a XOR gate or wired to any other gate as needed. I have this circuit on a bread board and it is working as it should. Remember, with Light Logic  the output MUST be through the LDR to ground to be a counted as a solid Zero / Low. Anything else is counted as a One / High

Discussions

Dr. Cockroach wrote 12/29/2021 at 11:45 point

Yup.....But now I have a headache before my first cup of coffee ;-)

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Ken KD5ZXG wrote 12/29/2021 at 02:19 point

Sum=XOR3(A,B,C)=NXOR(NXOR(A,B),C)

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