Double-tuned amplifier
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A double-tuned amplifier is a tuned amplifier with transformer coupling between the amplifier stages in which the inductances of both the primary and secondary windings are tuned separately with a cap
A double-tuned transformer from a radio receiver intermediate-frequency amplifier with its screening can removed
Biasing
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In electronics, biasing is the setting of DC operating conditions of an electronic component that processes time-varying signals. Many electronic devices, such as diodes, transistors and vacuum tubes,
A biasing example- using a battery and resistor to overcome the forward voltage drop of a diode