Settable logic gates/ multiplexer / demultiplexer

Multitool, with 8 jumpers you can make any ( 1, 2, 3 input) logic gate. Can use the same board for for 8ch multiplexing or demultiplexing.

Peetselectronics

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Description

Tool that can be handy for many jobs, for developing or in more permanent job. With 8 jumpers you can easy set the different logic gates without programming or building a circuit for the specific chip that has that gate.

All available with 2 and 3 inputs.
AND
NAND
Inverter
OR
XOR
NOR
exclusive OR
exclusive NOR

Multiplex / Demultiplex
With one board you can make a matrix of 4x4. you can drive 16 leds or read 16 inputs, but with two of those boards you can drive 64 leds or read 64 buttons.

Details

Settable logic gates

It use the cd4051 to set the input(A,B, C) the output(Q) to the desired value the jumpers on the switches(S1-S8).

On the upper left side, there are 3 inputs, A, B and C, you can connect *TTL signal directly to those pins. On the lower left side, you have the power pins, VCC and GND. Please do not reverse them, that will probably destroy your board.

*TTL signal explained: https://www.allaboutcircuits.com/textbook/digital/chpt-3/logic-signal-voltage-levels/