[chbot] noob mosfet/transistor question

Andrew Errington erringtona at gmail.com
Mon May 24 00:18:58 BST 2021

Hi Andrew,

The biggest problem is that you probably want a high-side switch. Most
switching applications can be implemented as a low-side switch, which is
simpler and therefore more common, so most of the circuits and modules you
will find are of that type.

Depending on how often you want to switch stuff, how about a relay? Cheap
modules, 5V signalling, 10A switching. Downsides: slightly bulky, finite
lifetime, higher current draw.

Andrew (is there an echo in here?)

On Mon, 24 May 2021, 10:59 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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