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Subject: Re: AW: Still Problems with AJB Remote
From: [IDC]Dragon (idc-dragon_at_gmx.de)
Date: 2004-07-10


Hello Matthias,

> # > Does anybody know, what are the differences of the remote input
> circuit
> # > inside the Studio Player's, old Recorder's and newer
> # Recorder's (like V2)
> # > ?
> #
> # Thare should be none, except for the strenght of the pullup.
>
> I think there are some !
>
> If I measure into teh NOT connected remote pin of my Studio, I have 3.3V
> -> There is a pull-up
>
> If I do the same with 2 Recorders, I measure 0V.
> -> So there is NO pull-up and the input has to be driven actively.

OK, let me rephrase, the once I've seen had a pullup. Let's hope the pin is
connected at all. Some FMs have no remote pin connection, but this can be
bridged internally.

>
> # > Maybe anybody has a schematic ?
> #
> # See the ducumentation pages.
>
> I did, but unfortunately I'm not able to locate the serial port and its
> connection.
> Maybe you could give me a hint ?

It's pin 2 of the board-to-board connector. No pullup drawn.

> # The universal bidirectional solution is that circuit with a MOSFET
> # inbetween, preventing the voltage to rise above 3.3V. I once
> # posted that, am too lazy to dig it out right now.
>
> Any idea which month/year or subject ?

Rockbox site search got me there:
http://rockbox.haxx.se/mail/archive/rockbox-archive-2004-03/0049.shtml

Jörg

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