[chbot] noob mosfet/transistor question

Charles Manning cdhmanning at gmail.com
Mon May 24 00:08:06 BST 2021

I assume you're wanting to do high side switching vs low side.

To do this with transistors you need to use two transistors: a PNP in the
high side, then use an NPN to drive the PNP.


-- Charles

On Mon, May 24, 2021 at 10:59 AM andrew dean <nzandydean at gmail.com> wrote:

> 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!
> -andrew (no, not that one.  No, not that one either.  The hairy one.  No…
> facial hair.  yeah, him)
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