Fw: [MLB-WIRELESS] more new edens

[Peter Rogers]

 Has anyone had any experiance with the curcuit mentioned below.

 Im currently in the process of building the curcuit. i have most of the
bits
 , im just trying to find the FET and not having much luck.

 Could anyone tell me if the "Power FET" (MPT3055E)  that Jaycar have listed
 would do as a replacement.

 There is also a much simpler design for a regulator here
 http://www.zorg.org/projects/carpc.shtml

 Also Steve , Tyson,

 have you had any issues with the voltage being to high when running ?? as i
 guess it should be about 13.8V when running.

 Regards

 Peter.

> ----- Original Message ----- 
> From: "Gizi" <gizi at iinet.net.au>
> Cc: <melbwireless at wireless.org.au>
> Sent: Thursday, September 04, 2003 11:49 AM
> Subject: Re: [MLB-WIRELESS] more new edens
>
>
> > Also on the mini-box website is this PDF
http://www.mini-box.com/Power.pdf
> > which covers the making of an additional 12V regulator to eliminate at
> > possibility of those 18V spikes shutting down the system in Automotive
> > Applications.  It appears to include some PIC micro controller code to
> help
> > handle power-up and shutdown sequencing.
> >
> > Mark
> >
> > ----- Original Message -----
> > From: "Steven Haigh" <netwiz at optusnet.com.au>
> > To: "Mikey A" <spikeymikey at optusnet.com.au>
> > Cc: <melbwireless at wireless.org.au>
> > Sent: Thursday, September 04, 2003 10:34 AM
> > Subject: Re: [MLB-WIRELESS] more new edens
> >
> >
> > > Mikey A wrote:
> > >
> > > > Tony Langdon wrote:
> > > >
> > > >>> It's not rocket science, as any major load such as headlights or
> > > >>> aircon running in a car causes a voltage drop to some extent...
> > > >>> minimising this will solve most problems - and will probably make
> > > >>> your car run better too :)
> > > >>>
> > > >>
> > > >>
> > > >> The question is whether the issue is low frequency "dips" or high
> > > >> frequency
> > > >> rubbish that's causing the problem.  The high frequency stuff can
> > > >> usually be
> > > >> handled by good filtering and grounding.  the voltage
irregularities
> > may
> > > >> need the DC-DC converter to fully tame - or simply, a SLA battery
> > > >> charged
> > > >> from the car's electrical system via a diode and current
limiting...
> > > >>
> > > > wouldn't a nice big capacitor like they use in car audio stop the
dips
> > > > when things like lights and the such are started?
> > > >
> > > Quite possibly. I've never needed to test this theory as I haven't had
> > > any issues... I'd say this is because I had a decent sized battery
> > > (560CCA - about 100Ah), and another decent sized battery (550CCA -
again
> > > about 100Ah) in the boot hooked up in parallel.
> > >
> > > --
> > > Signed,
> > > Steven Haigh
> > > http://wireless.org.au
> > > (Visit https://wireless.org.au to install our Root Certificate.)
> > >
> > > You can lead a fool to wisdom but you can't make him think.
> > > We have enough youth. What we need is a fountain of smart.
> > > I am root. If you see me laughing, you better have a backup.
> > >
> > >
> > >
> > >
> > > To unsubscribe: send mail to majordomo at wireless.org.au
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> > >
> > >
> >
> >
> > To unsubscribe: send mail to majordomo at wireless.org.au
> > with "unsubscribe melbwireless" in the body of the message
> >
>


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