Culture shock, Vasile ?   :)

I had the same reaction the first time I went to NY.

Not everybody is equipped to live in a zoo...

best regards,  Jack

On 2/17/08, Vasile Surducan <piclist9@gmail.com> wrote:
> On 2/16/08, wouter van ooijen <wouter@voti.nl> wrote:
> > I use PICs in classes. The PICs are on a PCB, but otherwise unprotected.
> > The students buy the PCBs, so they can work at home. Informatics
> > students can not be expected to know much about static electricity, so
> > for all I know they might use it to comb their cat's hairs. I have hadd
> > some pretty weird failures previous years, so it might be a good idea to
> > put some form of protection on all PIC pins. My idea is a resistor to
> > ground for each pin, but what value? Would 1M be sufficient, or should
> > it be lower?
> >
> > And what about the one pins that probably won't like any load, even 1M:
> > the oscillator input?
>
> Your luck is that both you and yours students are living in The Netherlands.
> If you'll protect with 1M for ESD in the US, will be useless. (in fact
> be glad you're not living at NY, believe me, I'm here from one week
> and I'm anxious to leave...)
>
> 1M to the ground will be not good and not bad. A student will always
> find a good way to fry the PIC. Here we have used series resistors and
> small capacitors to ground. But you can't use those on *all* pic pins.
> So, use a socket, do not protect anything and sell them hundreds of PIC's.
>
> Vasile
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