[Ti] external microphone jack on Ti 1 GHz

[Henry Kalir]

Chris Olson wrote:

>
> On Sep 8, 2005, at 5:26 PM, Henry Kalir wrote:
>
>> Thanks. I did located it prior to posting my  original message, and  
>> had inserted the external mic's plug into it. Now, while the  
>> earphones part of the set worked very well (when plugged into the  
>> earphone jack), the microphone does not seem to work when plugged  
>> into that jack.
>>
>> Does anyone have any experience/advice?
>
>
> The audio line in on the PowerBook G4 accepts line-level stereo  
> signals for connecting stereo equipment to the computer.
>
> If you want to use an external mic on line in you need a powered  
> microphone with the following specs:
>
> maximum input signal amplitude 2 Vrms (5.65 Vpp), +8 dbu peak
> input impedance 30 kilohms
> channel separation greater than 60 dB
> recommended source impedance 2 kilohms or less
> ground noise rejection greater than 40 dB
> frequency response 5 Hz to 20 kHz, +0.0, –0.5 dB
> distortion below –80 dB
> signal to noise ratio (SNR) greater than 90 dB A-weighted
>
> Alternatively you can get a USB mic and disable the internal  
> microphone in System Prefs.
> -- 
> Chris
>
Thanks, Chris. I'll unwrap my Griffin iMic once I make it back to the 
States, at the end of Sept.

Best,

Henry