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Date:      Wed, 28 Jun 2000 10:37:45 +0200
From:      Christoph Sold <so@server.i-clue.de>
To:        Leif Neland <leifn@neland.dk>
Cc:        hackers@FreeBSD.ORG
Subject:   Re: IrDA InfraRed Drivers. Would anyone use them?
Message-ID:  <3959B959.8CA6394D@i-clue.de>
References:  <Pine.BSF.4.05.10006280859150.56365-100000@arnold.neland.dk>

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Leif Neland wrote:
> 
> Talking about IrDA, how much hardware is needed on a Asus P2B ?
> Is it something which can be build from parts from the local electronics
> dealer?
Yes. Well, local... plan to do some shopping around.

> Is a schematic available?
c't (German computer bi-weekly) had one a few months ago
[http://www.heise.de/ct/ -- beware: no english version available]. Let's
see if I can dig it up... c't 25/99, p. 118.

Here's a poor man's ascii rendering of the schematic:

mainboard     |          IR-Receiver     
              |      Vcc +---------+     
   Vcc (+5V) -O----------O         |
              |          |         |
              |  Vo (out)|         |
IR in (IR Rx)-O----------O         |
              |          |         |
              |      GND |         |
             -O---o------O         |
              |   |      +---------+
              |   Y IR LED
              |   |
              |   Y low-current LED
              |   |
             -O---+
              |
IR Receiver: Honeywell Optoelectronics SDP 8600
IR Transceiver: LD 274 (bad fit, limits sending range to ~30cm)
LED: TLLR 4400

More explanations at
http://home.t-online.de/home/Rainer.Brang/infrarot.html [in German].

HTH
-Christoph Sold


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