RE: TI-H: IR Led problems
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RE: TI-H: IR Led problems
Look at it under a microscope. If you see two gold wirebonds connecting the surface of the die to the leadframe, then Greg is right. If you see only one wirebond, then they have an extra unused lead.
Mike
-----Original Message-----
From: Grant Stockly [SMTP:gussie@alaska.net]
Sent: Tuesday, April 28, 1998 9:29 PM
To: ti-hardware@lists.ticalc.org
Subject: Re: TI-H: IR Led problems
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
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