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check this : http://www.uploadarchief.net/files/download/gate_r.pdf
just for information, I use BT131-600 on 240vac, on some other web project , they use 2 resistor in serial , 380r+330r ( 710r ) .. d'autre encore - ( 450ohm)the resistor depend of the bt131 and moc3021for gate resistor check this :http://electronics.stackexchange.com/questions/53500/optotriactriac-how-do-i-calculate-the-gate-resistorwarning with "inductive load " , you have to add 1 resistor and condo
Low-Cost, Arduino-Compatible Drawing Robot
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