CrunchBox

What do you want for breakfast?  How about a nice bowl of Crummy Crunchies?

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… as in the infamous fake cereal from Haredevil Hare (the Definitive Bugs Bunny cartoon)

(see 5:20)

The CrunchBox is a talking cereal box.  It’s self powered, with three shake flashlight generators embedded in a foam block charging a 3.6v Ni-MH battery.  A bridge rectifier converts the alternating current induced by passing the magnet through the coil (left side of the diagram below), to direct current to charge the battery.

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This powers the Radioshack voice recorder/player (catalog number 276-1323)  which is rated 50mA @ 9V, but runs nicely on 2.2V, although the pitch rises as the voltage drops.  Below 2V, the player doesn’t function at all.  Note: you have to carefully solder to the switch on the circuit board: the play button is integrated on the board.  Make sure not to bridge the terminals!  I covered the wires with some hot glue to make sure the leads didn’t break off.

A microswitch glued to the box side closes when the top is opened, triggering playback.

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To add the coup de grace, some real cereal is in a shortened bag in the top, covering up the electronics, and a witty graphics package covers the (by comparison) pedestrian Weetabix box.

NB: don’t take this on the subway or ship it, as it does look rather suspicious. (see above)

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