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Light Logic - Diode Resistor Logic out of its cage

Out of its cage and set free !

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Buffer, NOT, AND, NAND, OR, NOR, XOR and XNOR.

Diode logic is no longer restricted to AND and OR gates but can now perform ALL logic functions and with very few components. This project is to demonstrate the full logic range that Light Logic performs. For a back history and circuits of Light Logic, go to my other Light Logic project https://hackaday.io/project/161669-light-logic. All gates use only diodes and resistors. No transistors or relays to be found here.

To put it simply, the heart of any Light Logic gate is its Led and CdS photo resistor. This pair acts as a switch much as does a NPN transistor. Yes the CdS LDR does have a pronounced response curve to light but that's the fun in exploring how to work with that curve and overcome the drawbacks of circuit speed.

The whole point of Light Logic was to prove that DRL diode resistor logic was not restricted to AND and OR gate functions.

  • A Sequencer - The Next Addition

    Dr. Cockroach3 days ago 0 comments

    I might as well add my seven step sequencer to the demo panel. This sequencer will find its way into my processor build this winter using only Light Logic circuits.

  • Adding more to the Educational Demo Panel

    Dr. Cockroach07/18/2019 at 23:31 0 comments

    I am planning to add other Light Logic circuits to the panel in order to showcase the progress of developing these logic circuits. I will add the original S-R Latch, a gate using a 0402 SMD Led, my smallest 3 input NAND gate constructed and of course the new XOR and XNOR single gate modules. There will be more to come.

  • A D-Latch added

    Dr. Cockroach07/14/2019 at 17:32 0 comments

    The demo panel now sports a working D-Latch flip-flop that includes a led driver in the form of a Buffer gate on the Q output. You might notice that the NAND gates have had their CdS voltage supply resistors removed. These NAND gates as wired do not need a voltage to indicate a ONE output. Indeed the output can be a floating 0 volts and still count as a ONE unless the following gate is either a OR or NOR gate. It is the ground connection that makes a firm ZERO output do the job. That is why I am using a Buffer for the output Led indicator.

  • The truth of Light Logic

    Dr. Cockroach07/04/2019 at 15:31 0 comments

    Here are the four stages of Light Logic gate operation.

    Switch setting 0,0

    Switch setting 0,1

    Switch setting 1,0

    Switch setting 1,1

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