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Build Your Own Transistor Radios by Ronald Quan

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Chapter 11Inductor-less Circuits

In previous chapters there was extensive use of coils, inductors, or transformers for radiofrequency (RF) and intermediate-frequency (IF) signals. This chapter presents alternatives to coils or inductors.

Ceramic Filters

Ceramic filters emulate high-Q inductor/capacitor (LC) circuits as band-pass filters. These filters generally are three-terminal devices with input, ground, and output terminals. However, ceramic filters also are made as two-terminal devices.

The earliest use of ceramic filters for amplitude-modulated (AM) transistor radios can be found in the 1960s. For example, the Motorola Model XP3CE and Model XP4CE 9- and 11-transistor radios from 1965 to 1967 each used a two-terminal ceramic filter in the ...

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