Problems with 12F675


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  1. #1
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    This is schematic I use. With my FUKE DT-830B I measure 3.5 mA -all the time- with no button push (so both relay OFF) and about 37 mA with one relay ON (without motor, of course). I remove the PIC and the current consumption is 2.5 mA (the two transistors ?) .
    I use the same code ; I compile him after copy/paste of Yours ! Maybe it's because of my multimeter ? Anyway, thank You all so much for support !
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    Quote Originally Posted by fratello View Post
    This is schematic I use. With my FUKE DT-830B I measure 3.5 mA -all the time- with no button push (so both relay OFF) and about 37 mA with one relay ON (without motor, of course). I remove the PIC and the current consumption is 2.5 mA (the two transistors ?) .
    I use the same code ; I compile him after copy/paste of Yours ! Maybe it's because of my multimeter ? Anyway, thank You all so much for support !
    Hi fratello, You could play with some resistors to bias those transistors so the base is more negative than the emitter to cause them to turn off more, do not tristate the outputs, drive them low, they will stay that way in sleep ( if I understand the data sheet that is ) . Try measuring the current with the relays out, betcha you get a low reading like Darrel did, MeThinks the logic zero on the port is still above zero volts (maybe due to internal leakage collector to base) giving the transistor some drive to increase the drain, try putting some emitter resistors in and see if it changes anything.
    Last edited by Archangel; - 8th August 2009 at 08:38.
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