Cheap eBay heater pad and its control circuitry with schematic
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These heating pads are very common on eBay. They consist of two sections of a resistive material and connecting strips sandwiched in a thick plastic document-style lamination. • The total thickness is just half a millimetre which is slightly disconcerting for a 240V heater. The power rating is determined by the area of the pad with suitably wider and longer heating sections. • The controller is just a very low power dimmer which is unlikely to actually be suitable for a 100W load as implied on its case. • These pads don't have any self regulation characteristic. They are basically just a flat flexible resistor. • If you enjoy these videos you can help support the channel with a dollar for coffee, cookies and random gadgets for disassembly at:- • http://www.bigclive.com/coffee.htm
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