On 19 Dez., 01:41, kony <s...@spam.com> wrote:
> On Thu, 18 Dec 2008 13:34:09 -0800 (PST), "borat.gunter"
> <borat.gun...@googlemail.com> wrote:
> >Hey Kony,
> >I really appreciate your answers and advices.
> >I uploaded 2 pictures of the 2 harddiscs, in case somebody wanna take
> >a look.
> >I just looked after "schottky diode 5v'" at digikey.com.
> >here comes the question again. What I am pretty sure is i need a 5v
> >not a 12v diode. plus SOD as a must.
> >But other parameters I have no idea at all. I have no idea how big the
> >current flow to the subcircuit. and
> >how big should the capacitor be for esd reason.
> >Is there anyway that I can learn how to decide this. How does the pcb
> >designer make their choice? It has to be some rules, or tutorials. or
> >we just know it.
> A diode's voltage rating is the maximum it is guaranteed to
> withstand. *Unless it is a zener diode you want the voltage
> rating to be above the voltage at that point in the circuit.
> By knowing the circuit, that is how they chose the component
> value to use.
> Since you have the diode from another hard drive circuit
> board, get out a magnifying glass and read the codes off of
> it and either go to the manufacturer's website or search for
> them here to find out it's specs:http://alldatasheet.com/
I did it first. But the info on the package was not so useful.
it is "VU gp802 AE"
I googled around, found nothing about this