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PATH Hardware Documentation
> PowerBook G3 Series 1999
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The external sound input jack is located on the back of the computer. The sound input jack accepts line-level stereo signals or an Apple PlainTalk microphone. When a connector is plugged into the external sound input jack, the computer turns off the sound input from the built-in microphone. The input jack has the following electrical characteristics:
Note
The sound input jack accepts the maximum sound output of an audio CD without clipping. When working with sound sources that have significantly lower levels, you may wish to increase the signal gain of the sound input circuit. You can do that using the Sound Manager as described in Inside Macintosh: Sound.
