Home Motor drivers Solar engines Type 1 (voltage) Type 2 (time) "Happy Birthday Singer" 555-based SE Type 3 (charge rate) Nocturnal Sensors Complete robots Misc. circuits   The BEAM Circuits Collection is a BEAM Reference Library site.		A 555-based solar engine An easily found single-chip solution In March of 2003, Manfred Schaffran posted a solar engine design using a 555 timer IC: Wilf Rigter simplified this circuit a bit, made it phototropic, and doubled it up to yield a photopopper design in a post later the same day. I've got this design written up elsewhere in the library.
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