From: Jason White <whitewaterssoftwareinfo@gmail.com>
To: Microcontroller discussion list - Public. <piclist@mit.edu>
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Date: Sat, 23 May 2020 10:19:26 -0700
Subject: Re: [EE] MOSFET Gate Voltage
Thread-Topic: [EE] MOSFET Gate Voltage
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I'd advise reducing the control signal to 3.3 volts. Without more
information it's hard to say what might (or might not) happen.

On Saturday, May 23, 2020, Josh Koffman <joshybear@gmail.com> wrote:

> Hi all,
>
> I'm modifying an existing battery powered LED lamp. I haven't fully
> completed my investigation, but I believe I have identified a MOSFET
> that is responsible for controlling the LEDs. I want to hijack that
> MOSFET and inject my own control signal. If my current theories are
> correct, this shouldn't be too hard.
>
> However, the circuit is running off a battery at 3.3V. The control
> signal I plan on using is going to be 5V. So that means the gate of
> the MOSFET will have more voltage on it than across D-S. Will this
> work, or will this end badly for the MOSFET?
>
> Thank you!
>
> Josh
> --
> A common mistake that people make when trying to design something
> completely foolproof is to underestimate the ingenuity of complete
> fools.
>         -Douglas Adams
> --
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Jason White
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