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Build Your Own Transistor Radios by Ronald Quan

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Chapter 18Detector/Automatic Volume Control Circuits

Although the title of this chapter may seem to cover simple circuits, the analysis of some detector circuits and automatic volume control (AVC) systems can be quite detailed and extremely tedious. In particular, a peak-envelope amplitude-modulation (AM) detector such as that shown in Figure 18-1 with D3, C13, R8, and R9 is actually very hard to analyze in terms of calculating for distortion, bandwidth, and reduction of Q of the tank circuit. Depending on the amount of modulation on the envelope, the resistor-capacitor discharge current varies.

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FIGURE 18-1 A superheterodyne radio with a peak ...

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