8-Bit Hex Decoder

A breadboard friend 8-bit Hex Decoder board

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Unlike standard "BCD to 7-Seg" chips like the SN74LS247N which only display 0 to 9, and only decode, this board is designed decode full 8-bit hex to dual 7-segment displays. This means that in addition to 0 to 9, A to F both 4-bit nibbles are also displayed. The GAL16V8 comes preflashed with the required code with source code available. The kit is packaged in a reusable plastic case as a through hole kit with all parts necessary for assembly.


PDF Schematic For GAL16V8 8-Bit Hex Decoder - This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License. CC-BY-NC 4.0, Copyright (C) 2018, David Anders. All Rights Reserved.

Adobe Portable Document Format - 16.23 kB - 03/24/2019 at 20:42


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hynek wrote 03/26/2019 at 11:17 point

Seems strange to connect NE555's output signal DIS directly to Vcc...

I'd suggest adding small resistor between R9 - DIS junction and Vcc...

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Dave's Dev Lab wrote 03/26/2019 at 12:53 point

yea, this was a quick-n-dirty first draft of the design. the 555 was suppose to be configured for 50% duty cycle. i've already corrected this... thanks for the feedback!

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