Re: [Gumstix-users] netCF at 5v?

[John A. <jal...@sp...>]

Hi DJ,

I'd like to add a power diode to my setup--4 AA NiMH batteries.  I find that
fully charged they put out over 5.25V, so dropping that down a bit would be
desirable.

Exactly what kind of diode are you using?  Current rating, voltage rating?
Is there a part number that you can recommend?  Thanks for your help,

John Alfredo

-----Original Message-----
From: gum...@li...
[mailto:gum...@li...] On Behalf Of DJ Delorie
Sent: Wednesday, August 06, 2008 6:00 PM
To: General mailing list for gumstix users.
Subject: Re: [Gumstix-users] netCF at 5v?


"Brad Fuller" <bra...@gm...> writes:
> >> It will survive 5v but can get hot, especially in a case. Best to use
4v.

In my furnace, I used a big power diode to drop 0.7v from the main 5v
supply, giving 4.3v for the gumstix + netcf.

It has two extra benefits:

1. The drop increases as current increases, which is just what you
   need to keep the regulator cooler.

2. It protects against reverse voltage (of course, on my board the
   power supply is soldered in, so no chance of plugging it in wrong ;)

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