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Re: CPU sounds from Phasor?

To: "Edhel Iaur, Esq." <drsmooth@relex.com>
Subject: Re: CPU sounds from Phasor?
From: "John E. Becker, Jr." <c621825@cclabs.missouri.edu>
Date: 1996/12/29
Newsgroups: comp.sys.apple2
Organization: University of Missouri - Columbia
References: <32c4a9dc.10378564@167.152.149.11>

Edhel Iaur, Esq. wrote:
> 
> If I listen closely to the speakers that are connected to my Phasor
> sound card (which is in my unenhanced revision B //e), I hear
> different quiet sounds, depending on what the computer is doing.  Such...
> always done this.  Does anyone know why this happens?

Most likely, this is electrical noise (voltages and currents) being 
generated by the motherboard and picked up by pre-amps in the sound card. 
 I do not have a //e or a Phasor card, but my Apple IIgs exhibits similar 
behavior, and is especially noticeable when I connect the sound output to 
a home stereo system and crank up the volume. The IIgs's internal audio 
circuitry can also pick up noises from the motherboard.

-- 

John E. Becker, Jr.
E-mail:  c621825@cclabs.missouri.edu
WWW:  http://www.cclabs.missouri.edu/~c621825

Follow-Ups:
- Re: CPU sounds from Phasor?
  - From: drsmooth@relex.com (Edhel Iaur, Esq.)

References:
- CPU sounds from Phasor?
  - From: drsmooth@relex.com (Edhel Iaur, Esq.)

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