There are a lot of capacitor types which you can find in the market, each of which is made for different, specific applications. With that said, one of those made for a specific purpose, which is for high voltage devices as doorknob capacitors. This is because it has a voltage capacity range of 5KVDC to 20 KVDC, which is much greater than other common applications. With that said, this article aims to give a close look at this type of capacitor.
Where can it be found?
This is one of the most common kinds of capacitors used in various industries, and this includes the telecommunications industry, as they are used in transmitters, SW (short-wave) transmissions, and RF, or radio frequency devices. They could also be used in heating devices, as well as in the manufacturing industry for electrical welding equipment, induction heating, and the like. They could also be used for the medical field, specifically heating devices and x-ray machines.
Doorknob capacitors are made of titanate, which allows it to compensate for temperature properly. This is because when components change in the circuit, it would allow a resonant frequency which is constant. The titanate material which this is made of allows it to withstand high RF voltages without the device getting damages of breaking down. Its oval shape also contributes to these having a low inductance, as well as better optimization of voltage.
Values of Doorknob Capacitors
There are several possible values for capacitors in terms of Picofarads for these doorknob capacitors, with 3 to 40 pf ratings for 5000 volts, and 25 pf 500 pf, and 0.001 microfarad for 7,500 volts. There are also 15KV standard capacitances which have ratings of 25 to 200pf, where the voltage is rated at 7,500 volts. The good thing about doorknob capacitors is that special ratings can be made upon request from the manufacturers.