VARIABLE condensers are now so commonly employed in radio receivers to tune circuits including a constant inductance that the use, some years ago, of variable inductances or variometers with fixed ...

[Scott Harden] has been working through a design for a variable inductor to use as a PTO, or permeability tuned oscillator. What you see above is the most recent fruit of these efforts. The variable ...

A tuned circuit formed by a capacitor and an inductor is a familiar enough circuit, and it’s understood that it will resonate at a particular frequency. As that frequency increases, so the size of the ...

Radiofrequency tuning elements made of quantum paraelectric materials are demonstrated at temperatures close to absolute zero — a temperature regime in which conventional electronic tuning components ...

Can a simple medium-wave radio receive shortwave broadcasts? In 2005, Burkhard Kainka answered that question with a creative two-transistor converter.

Recently Cavendish Kinetics, a MEMS (Micro-Electro-Mechanical-Systems) design house, issued a press release announcing a partnership with TowerJazz to produce tunable MEMS capacitors for use in mobile ...

While LCR meters are readily available at reasonable cost, they do not measure the Q of an inductor. This circuit enables you to measure the Q of inductors with the aid of an RF signal generator. A ...