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This PowerSmart head circuit was solarized, courtesy of Darrell Johnson, and dubbed the Solar Power Smart Head (SPSH). The SPSH circuit has been tweaked from time to time (each time improving its efficiency); Free-forming technique: Schematics:
This is a companion discussion topic for the original entry at https://community.robotshop.com/index.php/robots/show/solarized-powersmart-head-v2