[sdiy] Gate input protection

[Samppa Tolvanen]

On Sat, Nov 15, 2008 at 1:56 AM, Seb Francis <seb at burnit.co.uk> wrote:

> The first option looks an elegant solution, but I'm not sure it's safe if a
> negative gate signal would be present.  Then the forward voltage across the
> zener (~1V) would allow -1V at the dsPIC input.  Or is the 100K resistor
> enough to make this ok?  Is there a simple way to add protection for -ve
> gate voltages?
>

mmm - maybe just throwing in a forward biased diode after the resistor?

Samppa