Guest Naabish Posted May 17, 2013 Report Share Posted May 17, 2013 And problem is that , the transistor doesnt do anything ( Q1) when I measured it with oscilloscope the the transistor doesnt do anything PIC16F877A give PWM pulse from pin CCP1 to Q2 and same pulse is in R1 and R2 ?! Question - Should Q2 change pulses in R1 and R2?- Should I put resistor before Q2?- Why Q1 Doesnt change pulse?Hope u guys understand my bad english but anywayThis is fan controller and take ideas from this ' Quote Link to comment Share on other sites More sharing options...
audioguru Posted May 21, 2013 Report Share Posted May 21, 2013 When the PIC output goes high then Q2 turns on and supplies about +4V to R1. It turns on Q1.If your circuit does not do this then maybe you connected the pins on the transistors backwards. Check the pins on the datasheet. Quote Link to comment Share on other sites More sharing options...
Guest remonx6 Posted August 12, 2013 Report Share Posted August 12, 2013 ya it depends on voltage thanks guys Quote Link to comment Share on other sites More sharing options...
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