Today’s radio devices don’t use variable capacitors at all, since everything is digitally tuned, which has driven the price of variable capacitors way, way up, since they’re now a niche product.

Fortunately a variable capacitor is a surprisingly simple device, and one you can make yourself if you are of a mind to do so. [Patrick] did just that with his home-made capacitor, ...

Electronically-variable capacitors, whether used for T&M or in an end circuit, usually have a maximum capacitance of a few hundred picofarads, and a limited adjustment range. This Design Idea ...

LONDON — WiSpry Inc. (Irvine, Calif.), a provider of tunable radio frequency (RF) semiconductor products for the wireless industry, has announced that its patent application for microelectromechanical ...

The capacitor Q is in the 20 to 35 range depending on frequency with a voltage capability up to 30 V peak RF. Inputting a 5-bit word changes the capacitance. Switching time is 12 µs with a 10-µs ...

Coming from an IT background to an AM transmitter site might leave you with a world of questions. Mark Persons explains the ...

Quadintel’s recent global “ Thin-Film Dielectric Variable Capacitor Market “ research report gives detailed facts with consideration to market size, cost revenue, trends, growth, capacity, and ...

Micromachined RF capacitors are electrically variable Steve Bush Philips’ researchers have micromachined electrically variable RF capacitors. The devices, which are the microscopic equivalent of ...

Jo opened Jennings Radio and shortly thereafter created the first vacuum dielectric variable capacitor. These capacitors were used to help tune the frequency needed to operate the radio towers across ...