Re: TI-H: IR Led problems

To: ti-hardware@lists.ticalc.org
Subject: Re: TI-H: IR Led problems
From: gussie@alaska.net (Grant Stockly)
Date: Tue, 28 Apr 1998 21:28:58 -0700
Delivered-To: ti-hardware-outgoing@towerguard.unix.edu.sollentuna.se
Reply-To: ti-hardware@lists.ticalc.org


maybe gregs right...  So your problem would be using the wrong wire...  :)

>On Tue, 28 Apr 1998, Jon Olson wrote:
>
>> For some reason the detector (which liiks like a clear transistor) has 3
>> pins. I can understand why a real transisitor would need 3, but why would
>> this? The third pin should have been replaced the IR sensitive part.
>> Tell me if you see anything wrong with this...
>
>If I understand the IR receiver correctly, it is a transistor with a clear
>case. If you were to put it into a completely light-free space and hook it
>up as a transistor, it'd work just fine.
>
>The cool thing is that this type of transistor actually has two bases. One
>is that extra pin, the other is activated by shining IR light into the
>junction. So you can turn the transistor on with the IR or with the extra
>base connection.
>
>I think.
>
>
>--
>Greg Hill
>greg-hill@bigfoot.com
>www.comports.com/link