BHI NEDSP900, Руководство пользователя

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NEDSP900 Development Board
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internal source, such as batteries. To make sure that you are using the correct
connections always check with the manufacturers’ data sheet. The Bias is provided
jumper PL19 this applies a fixed Bias to either the Ring or Tip of the jack plug. Of course
if the microphone requires no bias or has an internal biasing system, then the Jumper
across PL19 can be removed.
If the microphone is supplied with a Stereo 3.5mm jack plug on it, then it’s likely that it
requires Bias on the middle ring of the plug. This is standard for Microphone or Headset
being used with a PC.
For a standard 3 wire PC type microphone place Jumper
in
position M (across pins 1 and 2).
If the microphone is supplied with a Mono Jack Plug,
then the Bias is likely to be required on the Tip of the
Jack.
For a two wire type electret insert place the jumper in
position T (across pins 2 and 3).
If the microphone does not require any bias current,
then the jumper PL19 should be removed altogether
Mic Signal - Tip
Mic Bias - Ring
Mic Ground
Mic Signal and Bias
Ground