Digital clock from old HDD.
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OK, thank you for 800k+ views, now here is secret:
Fast switching LED behind HDD plate, numbers on plate is "cutted" by combination "salt+water+electrodes+power supply (lot of A)"

It's pretty tricky, especialy timing of LEDs dependent on rpm if you want rock stable digits without moving.

Some of you guys, trying to do this too, someone succesfully.
So, watch your fingers guys! :D

music: Covenant - Spindrift

V2: [ Ссылка ]
using RC speed controller

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