[chbot] noob mosfet/transistor question
markaren1 at xtra.co.nz
Mon May 24 00:43:53 BST 2021
Please tell me more about your 12V load.
Is the 0V or the 12V power rail common to all of the devices you are
If you use a common 0V rail, the whole issue is much easier using an
N-CH FET with 5V (min) gate drive.
> Short version: What transistor/mosfet / resistor would you use to
> switch 9-13v 100-300ma from an arduino?
> Long version:
> I’ve had great success with a “prop hub/master controller” I
> designed, but keep running into a mental wall trying to make the
> next generation.
> In a nutshell, its a breakout for an arduino with a dozen rj45 jacks
> to power and control remote props. I have been trying to put a
> transistor inline with the 12v output to each remote prop so I kill
> power to each remotely.
> I have the free pins on the arduino and I know basically how I’d use
> the transistor/mosfet to switch, but I’m lost as to exactly what
> transistor/mosfet to use.
> The switched voltage would be between 9 and 13v, and I reckon the
> maximum draw from any device would be maybe 300ma?
> Does anybody have a favorite transistor for this application (where
> the gate is 5v and the throughput is 12v, and the 5v from an arduino
> would saturate the gate)? I was thinking maybe the transistor would
> be “closed” when the arduino went high, and switch off when low… but
> it could easily be the other way around if that’s a simpler circuit.
> Any wisdom appreciate!
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