电脑的麦克风电路以及JFET-MOSFET耳机功放电路
[09-14 01:16:40] 来源:http://www.88dzw.com 电子制作 阅读:8487次
文章摘要:电脑的麦克风电路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 circui
电脑的麦克风电路以及JFET-MOSFET耳机功放电路,标签:电子小制作,http://www.88dzw.com电脑的麦克风电路
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.
JFET-MOSFET耳机功放电路
Tag:电子制作,电子小制作,维修教程知识 - 电子制作
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