[TI-H] Re: TI-Link Mic

To: ti-hardware@lists.ticalc.org
Subject: [TI-H] Re: TI-Link Mic
From: "The Dos Man (Shawn)" <sells@inetnebr.com>
Date: Tue, 14 Aug 2001 08:32:16 -0700
In-Reply-To: <000e01c12252$650b8140$090a0a0a@qxd2j>
Reply-To: ti-hardware@lists.ticalc.org

At 10:20 AM 8/11/01 +0200, you wrote:

>Some time ago there was a thread about a TI-Link Mic. Yesterday, suddenly
>the word 'OpAmp' came up in my mind. You can use the opamp as a comparator,
>which compares the mic-signal with(/to?) a voltage from a resistor. It
>should be possible to record something in this way.
>
>--Ronald

In fact one could conect the inputs on the opamp directly to the mic, 
because the mic pulls current from one led and pushes it to the other (like 
a mini generator). And because the open loop gain is near 10,000 it could 
make a near digatal signal from your analog input. Just rember to put a 
diode on the output of the onamp so you get 1 and 0, and not 1, 0, and -1.

"Real programers don't check error messages for correct grammer."

References:

[TI-H] TI-Link Mic

From: "Ronald Teune" <rtwolf@gmx.net>

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