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Build Your Own Transistor Radios by Ronald Quan

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Chapter 10Exotic or “Off the Wall” Superheterodyne Radios

In Chapters 8 and 9, the superheterodyne radios were designed in a straightforward manner. The radio-frequency (RF), intermediate-frequency (IF), and audio signals were amplified with dedicated amplifiers. This chapter presents reflex superheterodyne radios. In one design, the mixer oscillator converter circuit doubles as an audio power amplifier. And in another design, the oscillator converter stage and IF amplifier circuit also operate as audio driver and audio output amplifiers.

A One-Transistor Superheterodyne Radio

Chapter 6 introduced a single-transistor reflex radio. This one-transistor radio was a tunable radio-frequency (TRF) circuit with the detected output recirculated back ...

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