Rockbox mail archiveSubject: AW: Still Problems with AJB Remote
AW: Still Problems with AJB Remote
From: Matthias Klumpp <Matthias.Klumpp_at_gmx.de>
Date: Sat, 10 Jul 2004 20:23:38 +0200
# -----Ursprüngliche Nachricht (Jörg) -----
# Can't you power the Atmel with 3.3V as well?
Of course I could, but my other signals that I'm emitting need a 5V level.
# > If I connect a open collector transistor stage [...]
# Such a transistor stage would invert the signal. I guess the average
# erceiver is not happy with that... ;-)
In fact there are two npn transistors to have the correct logic.
# > 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.
# > Maybe anybody has a schematic ?
# See the ducumentation pages.
I did, but unfortunately I'm not able to locate the serial port and its
Maybe you could give me a hint ?
# 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 ?
Received on 2004-07-10
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