Old School LED Light Show






20 thoughts on “Old School LED Light Show

  1. I like this, but after reading the description I could already imagine the circuit diagram. So I guess the kids these days still can understand somewhat older (but very elegant) techniques haha.

  2. @all
    Not bad at all. Not at all. However that EPROM should really be wearing something opaque. A square of black electrical tape for example, or even a foil write protect tab, (remember them?) would also work the same as the tape.

    The reason is that the UV components of an ordinary fluorescent light can cause that device to erase. But slowly, it takes about one to two weeks to slowly erase that way, the same as from the ordinary sun.

  3. Just last night I built a little LED light show on my breadboard using 7400’s and (of course) a 555. It has two switches, one to select the speed and one to select the movement direction. There are twenty LEDs, not counting the power indicator. Fun fun fun! I’ll post photos later.

  4. Anecdote has it that back in high school (about the same “era” this thing was made) someone put together a very complex machine using a Z80 CPU – and of course, an EPROM. Which worked amazingly well, until the kid got some publicity and someone took some pictures of the thing. Using a flash. With the EPROM uncovered. After which the CPU started glitching and crashing like hell… ;)

  5. Remember kids, if you can blink LED’s you can “blink” Mosfets and do this with 5000 watts of stage lighting.

    Most DYI DJ lighting setups are lame as hell and need some flair like this.

  6. ps. The “Download” link on that page will give you a much higher resolution image clearly showing all the individual wires. Facebook used to say “Download in High Resolution”, but I guess they become afraid that the large number of syllables in “Resolution” would scare away their users.

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