The instrument adopts sorting circuit showed by sound and light, which bring high detecting speed, high efficiency and low intensity of work.
仪器采用声光指示的快速分选电路，使产品检测的测试速度快、劳动强度低，工作效率高。
This article analyses the principle of detecting circuit in TV receiver. and explains theoretically the correct absorption of first sound IF so as to keep the sound from interfering the picture.
本文分析了电视机检波电路的原理，从理论上说明了伴音第一中频应吸收的强度，以使图象不受伴音干扰。
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