12/29/2016 - Really cheap LED's

A project log for The Cardboard Computer - IO is my name

My goal is a 4-bit CPU using recycled cardboard substrate and Diode Transistor Logic. This is an educational platform for me.

Dr. Cockroach • 12/30/2016 at 14:18•4 Comments

Found a string of Christmas led lights at a local thrift store for 1 dollar. There are about 200 led's and it looks like they operate around 3.5 volts and 3.75 ma each. These should be perfect for the output display section.

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1 to 4 demultiplexer

12/26/2016 at 09:25 • 0 comments

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LED display panel

12/31/2016 at 10:42 • 13 comments

Discussions

Yann Guidon / YGDES wrote 12/30/2016 at 15:34

It's a start :-)

Are you sure? yes | no

Dr. Cockroach wrote 12/31/2016 at 00:38

Yup, I like finding stuff like this :-) Reminds me of finding tv sets being tossed out and my salvaging the parts.

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Yann Guidon / YGDES wrote 12/31/2016 at 00:41

but, you know, we're in 2016... :-)

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Dr. Cockroach wrote 12/31/2016 at 00:53

True but around here there are still some older pre digital sets finding their way to the curb. Most of the parts are great for my ham radio projects and the color burst crystal is in the 80 m cw band

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12/29/2016 - Really cheap LED's

1 to 4 demultiplexer

LED display panel

Discussions

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