id_ruben Posted August 19, 2011 Report Share Posted August 19, 2011 Hi All,I am planning a 220v dc motor speed control using a microcontroller (PWM).But I am less familiar with the insulation between the avr to the motor drivers.Can I use the opto 4n25?.And how motor circuits using a mosfet or other.Thanks for the help.Regards,Ruben Quote Link to comment Share on other sites More sharing options...
Hero999 Posted August 19, 2011 Report Share Posted August 19, 2011 The 4N25 has a maximum voltage rating of 60V and a current rating of just 50mA so is unsuitable for driving the motor directly.You haven't provided enough information.How much current does the motor use?Where are you getting the 220VDC from? Is it a smooth supply such as a battery or an SMPS or it it just rectified mains?Does it matter whether the positive or negative side of the motor are switched? Quote Link to comment Share on other sites More sharing options...
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