Path: utzoo!attcan!uunet!zaphod.mps.ohio-state.edu!sol.ctr.columbia.edu!lll-winken!sun-barr!apple!apple.com!hunter
From: hunter@apple.com (Kurt Hunter)
Newsgroups: sci.electronics
Subject: Universal IR Remote Receiver
Message-ID: <10955@goofy.Apple.COM>
Date: 26 Oct 90 16:39:22 GMT
Sender: usenet@Apple.COM
Organization: Apple Computer, Inc.
Lines: 25

Does anyone know of a discrete or integrated amplifier circuit that can be 
used to increase the signal of an IR detector diode while preserving all 
the IR signal data?

What I want to do is detect both the IR signal data pattern and it's 
carrier frequency as a TTY logic level signal.  I believe typical data 
pattern frequencies are in the range of about 45ms, while carrier 
frequencies have a range of about 30kHz to 80kHz.

I'm also thinking I will need some filtering in addition to amplification, 
however, I don't want the filtering to block out the carrier frequencies.  
I've been told there are some commercial IR pre-amplifier products that 
amplify, filter and wave-shape an IR signal from a directly connected IR 
detector, unfortunately, these same products also demodulate the signal's 
carrier frequency and that's not what I'm after.  Any suggestions?

If any of this sounds weird, it might be because I'm a professional 
software geek :-) and a very part-time hobbyest hardware nerd.


--
Kurt Hunter                             e-mail: hunter@apple.com
Apple Computer, Inc.                    AppleLink: HUNTER.K

Disclaimer:  This posting is not related to Apple Computer, Inc. in any way.