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Tri-State Buffer with Diodes and Resistors

A project log for LIGHT LOGIC - HIC SVNT DRACONES

Using a LED/LDR pair to form inverting Photonic logic gates. The entire Boolean logic set handled by resistors and diodes! Who'd'a thunk

Dr. CockroachDr. Cockroach 10/28/2019 at 09:430 Comments

Yeah, I know. All my projects on this page are using only diodes and resistors but I have to keep telling myself that.

I decided to see if Light Logic would work in a Tri-State Buffer circuit intended for transistors and it actually works very nicely. No tricks used in this buffer circuit and a quick look at it will show just how basic and striped down it is. With Enable set low, the output remains Hi-Z no matter the Data setting and with Enable set High then the Data High or Low passes through just as desired.



The ugly wiring on the back side.

The really simple and basic circuit.

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