series radio tuner

[Idea04]

How do you connect a variable capacitor to an inductor to make a series radio tuner?
And where do you tap the resonant frequency to send to the RF amplifier?

[vk6kro]

Do you mean: how would you use a series tuned circuit to tune the input of a radio receiver?

The series tuned circuit is able to give a very large voltage step-up if you have a low impedance source driving a high impedance load. The circuit has no power gain, so it converts a low voltage at high current to a higher voltage at a lower current.

This depends for its success on the antenna and also it will depend on the frequency for a given antenna.

I will attach a possible circuit. For the circuit to be of much use, I have shown a tapped inductor which may allow for the use of practical antennas.

The series circuit, though, is just the inductor and the variable capacitor.