[A83] Re: (OT?) Headphone / Line out <---> Link Port

To: <assembly-83@lists.ticalc.org>
Subject: [A83] Re: (OT?) Headphone / Line out <---> Link Port
From: Peter-Martijn Kuipers <hbyte@hbyte.net>
Date: Tue, 18 Feb 2003 08:08:49 +0100 (CET)
In-Reply-To: <OE14TqZHotpk7y8o3fq00003288@hotmail.com>
Reply-To: assembly-83@lists.ticalc.org

You could try to add the following transistor circuit:
                       c /----------- to jack
    --------       b|  /
----| 220R |--------|<   npn
in  --------        |  \  |
                       __\|
                        e  \ 
                            |
                           ---

This cirquit logically inverts the signals, so the lines get shorted if a 
high voltage is present on "in".

I didn't test the circuit, so it might not work, if not, try to mess 
around with the resistor first. It may need to be higher or lower.

--Peter-Martijn



On Mon, 17 Feb 2003, Jeff wrote:

> Hi all,
> 
> This isn't exactly an assembly question, but since TI-Hardware seems to be
> dead, what the heck...
> 
> Can the headphone jack or line out jack of a stereo audio device directly
> connect to a TI calc and send highs and lows?  I have made a program that
> can recieve variables from audio CD's through a headphone jack.  So far my
> program has detected when I manually touch ground to the white and red
> conductors.  However, it doesn't detect when I play a CD with a straight
> tone from headphone or line out jack to the link port.  Do I need some
> transistors or diodes?
> 
> Jeff
>

References:

[A83] (OT?) Headphone / Line out <---> Link Port

From: "Jeff" <telepath75@hotmail.com>

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