Caple C871i Bedienungsanleitung PDF herunterladen (Seite 85)

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Apple II Computer Info

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### Created : Sunday, January 14, 1996 Modified: Sunday, January 14, 1996

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

### File Size: 1732 bytes 1 KB

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Path: ns-mx!hobbes.physics.uiowa.edu!zaphod.mps.ohio-

state.edu!mips!spool.mu.edu!agate!dog.ee.lbl.gov!nosc!crash!pnet01!pro-

hindugods.cts.com!steve

From: [email protected] (Steve Fenwick)

Newsgroups: comp.sys.apple2

Subject: Re: GS digitizing sounds

Message-ID: <[email protected]>

Date: 1 May 92 04:00:28 GMT

Sender: [email protected]

Organization: Crash TimeSharing, El Cajon, CA

Lines: 28

In <[email protected]>

[email protected] (Tony Kolstee) writes:

>I also have a question on the mod that I did. When I hook the wires up to

>the SPEAKER port on my amplifier and put up the Oscilliscope (sp?) screen,

>the sound wave centers around the bottom. If I blast the volume and then

>bring it back down, the wave centers in the middle, and it works okay.

>Why is this? And how come if I connect my speakers to the amp at the same

>time the wave stays at the bottom no matter what I do? Could this be an

>impedence problem?

I _had_ that EXACT same problem. It is a grounding problem. The Line and

Mic outputs of most equipment has a lower reference voltage for the audio

waveform signal. To fix this, you need to run it through any op-amp I.C.,

and have a potentiometer going to ground from the inverting input to adjust

the waveform level. Make sure you have a relatively large value capacitor on

the output, because I noticed that with small values, the waveform starts to

'drift' down, I don't know why, though. I used an LM324, but any op-amp

should work.

Hope this helped!

Steve

ProLine: steve@pro-hindugods | I know

Internet: [email protected] | that you

UUCP: pro-hindugods!steve%[email protected] | know.....

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Apple II Computer Technical Information : Apple II Family Hardware Info

ftp://ground.ecn.uiowa.edu/2/apple2/miscinfo/hardware : May 2001 : 85 of 572

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