intermediate frequency interference ratio 中频干扰比 intermediate frequency preamplifier 中频前置放大器 intermediate frequency stage 中频级 ..
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low-frequency preamplifier 低频前置放大器
intermediate frequency preamplifier 前置中频放大器 ; 中频前置放大器
We designed a large current AC constant current source of low frequency, and an electronic preamplifier with high sensitivity for the use of the instrument.
仪器中设计了大电流低频交流恒流源，高灵敏度前置放大器，并用单片机软件代替了大量电子线路的功能。
Expounds the principle of audio frequency power amplifier is designed for manostat, preamplifier, volume control, power amplifier four parts digital power amplifier megaphone.
阐述了音频放大的原理，设计了以稳压电源、前置放大、音量调节、功率放大四部分组成的数字功率放大扩音器。
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