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Subject: Re: Auto-Startup of Archos Studio...
From: Matthias.Klumpp_at_gmx.de
Date: 2004-06-14


Hi all,

You are absolutely right, talking about the electricity belonging to the
ignition circuits.

But IMHO that power spikes you are mentioning are not existing in the cars
12V net that comes inside the passenger compartment.
As I'm informed, that voltage is filtered to get rid of such kind of
damaging peaks.

Well, car voltage is not the best filtered one, but e.g. I know, that radios
or other electronic control units (like motor ECU or ABS/ESP ECU's) are
definetly NOT filtering a lot (I'm talking about German cars only, maybe
could be different in the US or somewhere else).

I was using cigarette lighter adapters (that simple 12 adapters as well as
regulated ones) for quite a long time for different purposes (PC's, laptops,
music stuff...) and all of them were never damaging anything (only if I
connected them wrongly sometimes).

The only thing I observed together with my AJB and a regulated car adapter
is, that because of the bad ground connection to the cigarette lighter in my
car, I got a lot of ignition dependant disturbance.
I even once measured that with a high speed oscilloscope and a spectrum
analyzer when I was trying to find out the exact source of that.

Only thing that has to be taken care of is, that most car voltages can be
between 10V (bad generator, regulator, battery) and up to 14-15V.

Greetings

Matthias

> ---- Alexander wrote ----
> You might want to be careful. The starting of a car has been known to send
> power spikes through devices. I was in Radio Shack and the guy in front of
> me
> had either popped the fuse on his cigarette lighter ac adapter or blown
> his
> cell phone. The guy said that the spikes, when they happen, can be in the
> 10s
> of thousands of volts.
>
> ---- Carsten wrote ----
> > Hi,
> >
> > is there any mod available which will startup the Archos Studio as soon
> > as there is power connected to the DC-IN port?!
> >
> > I want to use the Archos in my car and I'm searching for a way to
> > automaticly startup as soon as the engine is started.
> >
> > Bye, Carsten
> > _______________________________________________
> > http://cool.haxx.se/mailman/listinfo/rockbox
>
> - --
> - --Brad
> ========================================================================
> Bradley M. Alexander |
> SysAdmin, Security Engineer | storm [at] tux.org
> Debian/GNU Linux Developer | storm [at] debian.org
> ========================================================================
> Key fingerprints:
> DSA 0x54434E65: 37F6 BCA6 621D 920C E02E E3C8 73B2 C019 5443 4E65
> RSA 0xC3BCBA91: 3F 0E 26 C1 90 14 AD 0A C8 9C F0 93 75 A0 01 34
> ========================================================================
> There is always a way.
> The easy way is always mined.
> --Murphy's Laws of Combat
>
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> _______________________________________________
> http://cool.haxx.se/mailman/listinfo/rockbox
>

-- 
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Sent by: Matthias Klumpp
E-Mail : Matthias.Klumpp_at_gmx.de
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