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momentrabbit July 9 2010, 04:23:28 UTC
There's not really much to work with - this sort of thing is pretty common. The chip's hiding under the black epoxy blob: the diodes (red cylinders with black tips) are almost certainly being used for their voltage drop, as Halfelf notes, and resistors for current limitation. The chip is probably just a custom die designed to flash LEDs. n.n

There used to be a lot of keychains with about eight different sound effects, about the same size, small switch grid with a membrane keypad, same sort of potted chip and a tiny speaker. Great if you wanted to add bloops or explosions to a project, just snag one of the things from a dollar store and solder wires in on the effects trigger you wanted..

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postrodent July 9 2010, 23:58:24 UTC
I miss those things. They were major desire objects in junior high and I never put my hands on one. Seems not impossible (for Peggy) to write some code that'd do that.

Anyway, I actually suspected that nobody would know _exactly_ what's in there, there's just too little information, but this was a lark anyway. :)

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postrodent July 9 2010, 23:59:58 UTC
I do appreciate the thought, but I've built a 555/4017 circuit and this sir is no 555/4017 circuit. Not any that I know, anyway. :) The behavior just doesn't fit, and where's the capacitor that the 555 would need? I guess it could be hidden under the epoxy, but that seems odd and unlikely to me.

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ab3nd July 21 2010, 02:54:44 UTC
So, here are my guesses and not-so-guesses ( ... )

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