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Subject: Re: BMW IBUS <-> Archos Jukebox (as CD Changer)
From: [IDC]Dragon (
Date: 2004-03-15

> >>>Another explaination could be that the pullup is very strong, so the
> Archos
> >>>fails to pull it low. How much current do you measure when you short
> source
> >>>to ground (or bus to ground)? The SH is specified to sink max. 10 mA.
> I think this is the problem. When I tried to measure the necessary current
> to bring the bus to 0V (by shorting IBUS and GND with the multimeter) my
> multimeter displayed 0.2 in the 200mA range. However when I switched to
> the
> 20mA range it displayed 0.02. So I'm not trusting the readings.

Do you have access to a different meter?

> If my assumption is correct, what can be done to my circuit? I'm using the
> one pictured here: as it
> seems to be the one that works the best...

Why do you have 2 transistors? Can this work? My suggestion was to do it
like the left part.


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Page was last modified "Jan 10 2012" The Rockbox Crew