Using Ardunio and MOSFET to drive 5V to 12V

t06afre

Joined May 11, 2009
5,934
Just a thing then simulating your original schematic. I found some problems. The SOL got only about 8 volt. You should really move the SOL as I suggested in post #14
 

DC_Kid

Joined Feb 25, 2008
1,072
Connect your relay between Drain and +12 volt and Source directly to GND. One thing however your circuit will kind of be an inverter Low level from the Arduino will turn the relay on, and high level off
p fet and a pull down will flip it back to ard-high relay-on, etc.

post #18, for just 300mA why a bjt at all, why not just a fet like the Rohm RSQ045N03TR ? i would also add a ~20v zener to gnd off of the drain.
 
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