🚀 go-pugleaf

In article <3542@s.cc.purdue.edu>, aic@s.cc.purdue.edu (George A. Basar) writes:
> 	 I've built a relay for the remote control of the cable 
> 	 converter and it works fine except for on hitch.  The relay doesn't
                          ^^^^^^^^^^
> 	 talk to the converter box.  I basically have an I.R. detector
> 	 driving some logic which translates the signal to digital, then wires
> 	 that to the emitter(815nm) which sits in front of the cable box
> 	 (very close proximity).
> Question: Why doesn't this work?

I am not sure what "works fine" means in this context, but I have done
some playing around with IR detectors and have experienced similar
problems.  Typical (e.g. Radio Shack) bipolar Photodiodes and
Phototransistors are not fast enough to detect the typically 40 KHz
carrier used by IR controllers.  A PIN diode such as the TIL 413 or
SFH205 must be used (I purchased mine from Active Electronic Sales).  Typical
receivers are broad-band enough that when used in close proximity to the
transmitter do not require a great deal of concern over frequency or
filtering.

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Peter Fales		UUCP:	...att!ttrde!pfales
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