Caple C871i Manual de usuario descargar pdf (Pagina 88)

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Apple II Computer Info

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### FILE : digitizer.circuit2

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### Created : Thursday, January 16, 1997 Modified: Thursday, January 16, 1997

### File Type: "TEXT" File Creator: "LMAN"

### File Size: 5188 bytes 5 KB

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tro!cassius.ee.usyd.EDU.AU!adrianw

From: [email protected] (Adrian Whichello)

Newsgroups: comp.sys.apple2

Subject: Sound input to the 2gs [long]

Date: 13 Jan 1997 22:53:35 GMT

Organization: Department of Electrical Engineering, Sydney University

Lines: 105

Distribution: inet

Message-ID: <[email protected]>

NNTP-Posting-Host: cassius.ee.usyd.edu.au

Hi everyone,

I've been mucking around with getting sounds into the 2gs lately, and thought

I'd share the results, so far. Ages ago David Empsom wrote about using the

internal ADC (to comp.sys.apple2):

> It is the 7-pin molex connector in the lower right corner of the

> motherboard, next to the Ensoniq. All stereo cards plug into this

> connector.

> Most of the pins are used for sound output and associated demultiplexing.

> Pin 1 is the sound input and pin 2 is analog ground. (Pin 1 is the one

> closest to the back of the computer, right next to the legend "J25" on the

> ROM 1 motherboard.)

NB^^^^^^^^^^^^^^^^^^ THIS IS BACKWARDS!!! Pin 1 is closest the FRONT of the

2gs, ie close to the green power on light.

> The sound input expects a signal which has a maximum range of 2.5V peak to

> peak. The input impedance is 3000 ohms.

> I'm not all that clear on audio impedances and voltages, so I'm not sure

> if it is safe to connect anything directly to this pin. It may be

> necessary to use a simple amplifier circuit to handle impedance matching.

> Can anyone elaborate on this?

I found the following circuit on ground (in

ftp://ground.isca.uiowa.edu/apple2/MiscInfo/Hardware/digitizer.circuit

[quote]

If you don't mind putting together a few parts, you can build your own

Apple II Computer Technical Information : Apple II Family Hardware Info

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Caple C871i Manual de usuario Pagina 88

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Caple C871i Manual de usuario Pagina 88

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