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A head circuit using an 74XX240 that follows light and will blink lights when it has locked onto a light source
Goes with the monocore in the other section, this I borrowed from the BEAM Heretics in the Wilf Righter archive.  The inverters is 74HC/AC240. 
The power smart head was originally designed by Wilf Wrighter and is a more power effecient head.  Ben Hitchcock added the solar engine to the circuit