Caple C871i Manual do Utilizador descarregar pdf (Página 458)

Apple II Computer Info

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### Created : Friday, May 1, 1998 Modified: Friday, May 1, 1998

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

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From: Rubywand <[email protected]>

Newsgroups: comp.sys.apple2

Subject: Re: Apple speaker

Date: Thu, 30 Apr 1998 23:50:22 -0500

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TomMage writes ...

> Hello, I tried it, bought a cable with an RCA plug at one end and two > bare

wires on the other end. Tried hooking it up by splicing into the > speaker wires

and also disconnecting the speaker wires at the post and > hooking up directly to

the posts. Neither method seems to work, do you > have any idea why??

....

Yes. The speaker is in the Collector circuit of the output

transistor-- one end of the spkr goes to a resistor and capacitor

connected to the output transistor Collector and the other goes to +5V

(not ground). To get an audio output signal, the spkr must be in place;

or, you can substitute a 1 watt resistor-- something in the 22-39 Ohm

range.

The output should come from the side of the spkr (or 1 watt

resistor) going to the resistor & capacitor connected to the

transistor-- i.e. the side which is _not_ the +5V side. The output goes

through a coupling capacitor to the center lead of your RCA plug. The

Ground side of the RCA plug goes to ground.

"Ground" is DC ground = any motherboard trace area which is

connected to the ground side of the power supply. For example, the

outside "shell" of the composite video output is soldered to ground.

Apple II Computer Technical Information : Apple II Family Hardware Info

ftp://ground.ecn.uiowa.edu/2/apple2/miscinfo/hardware : May 2001 : 458 of 572

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Caple C871i Manual do Utilizador Página 458

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