A HI-FI active integrated speaker 01
Source: InternetPublisher:风向西瓜 Keywords: Speakers HI-FI MDASH Updated: 2021/03/25
The circuit principle of the preamplifier circuit, power amplifier and power supply part is shown in Figure 9-71. Each channel of the convex preamplifier stage is composed of the king of
two-stage operational amplifiers NE5532. The first stage is a non-inverting amplifier, which has a very high The input impedance and extremely low output impedance
are used to isolate the subsequent stage and avoid the influence of the load. 4 The output of the first stage
is sent to the second stage through a three-frequency (100Hz, 100Hz, 1000Hz) balanced network. RP1, RP2.RP3, etc. form an inverting amplifier. The functions of RPl.RP2 and RP3
are shown in the amplitude-frequency characteristic curve in Figure 9-72. Due to the use of low-noise, high-speed NE5532 in this part of the circuit, the signal-to-noise ratio,
dynamic range, transient response and control effect of this unit have reached a very high level.
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