[Photo] Hi-Fi dubbing control amplifier production

2003, Issue 4, Category: Audio Technology

The dubbing control amplifier is suitable for the mixing of speech and music in the process of recitation by a literary and artistic group and the inscription of a wedding video into a CD.
The microphone circuit is composed of a single op amp OP27 to form a common mode strong noise suppression circuit, which has a very strong ability to suppress current hum and line crosstalk signals. The music input and mixing part use high-speed low-noise op amp AD827 (only the L-channel part of the circuit is shown in the figure). To ensure that the amplifier reaches the Hi-Fi level, the transconductance volume control (GM) circuit is used in the microphone amplification and music channel volume adjustment to minimize the noise caused by the potentiometer. And can also improve the dynamic range of audio. In the picture, the two contacts "MIC2 IN" and "to RCH" should be connected to each other between the two channel circuit boards. In this way, the sound image localization of the voice actor is in the middle position.

Zhongbaocheng, Zhejiang



Technical area detailed analysis of Doherty power amplifier design load traction principle (top) detailed analysis of Doherty power amplifier design how to improve efficiency (bottom) analysis of voltage follower input and output error analysis Solve the effect of power amplifier on emi

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