I have a question about my circuit, I would like to turn on/off a car horn which draws around 8 Amps at 12 Volts with arduino and mosfet as seen in the picture. Before I didn’t use optocoupler and transistor to turn on the mosfet I did that directly from arduino pin and it worked like a charm, but I would like to add some safety to my circuit, so my question is, will this circuit work properly? and if I use transistor is it still necessary to use 47k Ohm resistor between gate and source of mosfet so it doesn’t accidentally turn on? also does R3 have correct value?
I forgot to add that on the schematic but Q1 is BC 337 NPN Transistor, and LOW on the schematics = digitalWrite(pinNumber, LOW).
Many thanks in advance for all Your help guys.