電腦的麥克風電路
電腦的麥克風電路
The sound card for a PC generally has a microphone input, speaker output and sometimes line inputs and outputs. The mic input is designed for dynamic microphones only in impedance range of 200 to 600 ohms. Lazar has adapted the sound card to use a common electret microphone using this circuit. He has made a composite amplifier using two transistors. The BC413B operates in common emitter to give a slight boost to the mic signal. This is followed by an emitter follower stage using the BC547C. This is necessary as the mic and circuit and battery will be some distance from the sound card, the low output impedance of the circuit and screened cable ensuring a clean signal with minimum noise pickup.
非常好我支持^.^
(0) 0%
不好我反對
(0) 0%
相關閱讀：
- [音響技術] 愛普科斯抗電磁干擾MEMS麥克風解決方案 2011-03-14
- [廠商新聞] ADI公司推出ADMP441首款INTER-IC SOUND數(shù)字MEMS麥克風 2011-01-30
- [新品快訊] 業(yè)界首款高性能ADMP441新型MEMS麥克風 2011-01-29
- [新品快訊] 樓氏電子發(fā)布第四代新型MaxRF麥克風 2011-01-07
- [新品快訊] 樓氏電子公司MEMS麥克風侵犯ADI公司專利權 2010-12-28
- [新品快訊] 歐勝發(fā)布領先的數(shù)字微機電系統(tǒng)(MEMS)麥克風WM72 2010-11-08
- [測試/封裝] ADMP405: 全向MEMS麥克風，具有底部端口和模擬輸出 2010-08-14
- [新品快訊] ST推出全新麥克風接口芯片 提升音質(zhì)性能 2010-07-21
( 發(fā)表人：發(fā)燒友 )