eplanet Posted February 15, 2012 Report Share Posted February 15, 2012 hi friends please show me how can i calculate resistor value connected to base of 2n2222?thanks Quote Link to comment Share on other sites More sharing options...
Hero999 Posted February 15, 2012 Report Share Posted February 15, 2012 Assuming Vcc is the same as the voltage powering the MCU, as a general turle of thumb, make the base resistor 10 times the value of the relay's coil resistance. Quote Link to comment Share on other sites More sharing options...
eplanet Posted February 15, 2012 Author Report Share Posted February 15, 2012 thanks hero999is there any formula for this issue? my coil is 57ohm Sidney Bell 1 Quote Link to comment Share on other sites More sharing options...
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