Monday 4 September 2017

LED still shines when MOSFET is off


I have the below circuit and when I turn off the MOSFET (Logic 0 at gate vg) the LEDs (LED1 and LED2) still shine with a small intensity. When I replace the LED with an incandescent lamp (car lamp) the lamp does not shine at all. Does anyone know why?


Ciruit 1:

Ciruit 1


Ciruit 2:


Ciruit 2


MCH6445-TL-E -> Q1 Mosfet's datasheet: http://www.mouser.com/ds/2/308/MCH6445-D-108455.pdf


MMBF170LT1 -> Q3 Mosfet's datasheet: http://www.onsemi.com/pub_link/Collateral/MMBF170LT1-D.PDF


Final circuit which works fine: enter image description here




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