I had this idea for a growling and screaming altoids tin based on the 555 timer running in astable mode several days ago, and just today while reading Hackaday I see that Dino from Dinofab.com and Hackaweek.com just built it!  I was like, “sonofa…” but then saw he did not implement it quite the way I had planned, so off …..

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Schematic

Schematic

Update 2:

The 555 board for the cradle swing is finished and installed.  For video proof check out this link:

A schematic is also posted above.

The headphone tube amp is also finished.  the high voltage for the tubes is generated by a 555 in astable mode driving a fet and a custom hand wound transformer. For video proof check out …..

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