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Rockbox mail archiveSubject: AW: Still Problems with AJB RemoteAW: Still Problems with AJB Remote
From: Matthias Klumpp <Matthias.Klumpp_at_gmx.de>
Date: Sat, 10 Jul 2004 20:23:38 +0200 Hi all, # -----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 connection. 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 ? THX Matthias _______________________________________________ http://cool.haxx.se/mailman/listinfo/rockbox Received on 2004-07-10 Page template was last modified "Tue Sep 7 00:00:02 2021" The Rockbox Crew -- Privacy Policy |