電腦的麥克風(fēng)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.
JFET-MOSFET耳機(jī)功放電路
10月3日消息,蘋果AirPodsPro2比上一代增加1.5小時聆聽時間,而監(jiān)管文件顯示,這一提升部分是由于耳機(jī)本體的電池增大了。
關(guān)鍵字: 蘋果 AirPods Pro 2 耳機(jī)傳統(tǒng)上,耗盡型 MOSFET 被歸類為線性器件,因為源極和漏極之間的傳導(dǎo)通道無法被夾斷,因此不適合數(shù)字開關(guān)。這種誤解的種子是由 Dawon Kahng 博士播下的,他在 1959 年發(fā)明了第一個耗盡型 MOSFET——只...
關(guān)鍵字: MOSFET 數(shù)字開關(guān)