rompelstilchen
Full Member level 2
hello
I ordered LMV358IDR comparators to drive FDN340P transistors like on the following schematic
https://www.arduino.cc/en/uploads/Main/arduino-uno-schematic.pdf
but I find it ackward that there is no pullup resistor, I read many times a comparator needed one
- does it ?
- since the comparator appears to be powered by 5V USB, if there is no USB plugged in, is it's output low by default, so the FET is open letting any VIN supply go through ? how can I be sure of this ?
regards
I ordered LMV358IDR comparators to drive FDN340P transistors like on the following schematic
https://www.arduino.cc/en/uploads/Main/arduino-uno-schematic.pdf
but I find it ackward that there is no pullup resistor, I read many times a comparator needed one
- does it ?
- since the comparator appears to be powered by 5V USB, if there is no USB plugged in, is it's output low by default, so the FET is open letting any VIN supply go through ? how can I be sure of this ?
regards
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