Hiv0ltage developed a DIY manual heated bed temperature controller and created a construction guide. It looks easy to assemble and implement. It is a work in project and the guide will be updated.
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Detailed construction guide:
http://www.instructables.com/id/3D-printer-heated-bed-temperature-Controller/
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| It is based on 555 PWM controller |
Detailed construction guide:
http://www.instructables.com/id/3D-printer-heated-bed-temperature-Controller/