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view source for variable capacitor wikipedia jump to content main menu main menu move to sidebar hide navigation main page contents current events random article about wikipedia contact us contribute help learn to edit community portal recent changes upload file special pages search search appearance donate create account log in personal tools donate create account log in view source for variable capacitor add languages article talk english read edit view history tools tools move to sidebar hide actions read edit view history general what links here related changes upload file page information get shortened url switch to legacy parser in other projects wikidata item appearance move to sidebar hide variable capacitor you do not have permission to edit this page for the following reason this ip address range has been globally blocked this does not affect your ability to read wikipedia pages most people who see this message have done nothing wrong some kinds of blocks restrict editing from specific service providers or telecom companies in response to recent abuse or vandalism and can sometimes affect other users who are unrelated to that abuse review the information below for assistance if you do not believe that you have done anything wrong this block affects editing on all wikimedia wikis the ip address or range 5 135 0 0 16 has been globally blocked by jon kolbert for the following reason s open proxy webhost visit the faq if you are affected this block will expire on 04 29 8 january 2027 your current ip address is 5 135 42 194 even while globally blocked you will usually still be able to edit pages on meta wiki if you believe you were blocked by mistake you can find additional information and instructions in the stewards block wizard other useful links global blocks help i have been blocked you can view and copy the source of this page special forms of mechanically variable capacitors file variable capacitors agr jpg thumb various forms of variable capacitors multiple sections very often multiple stator rotor sections are arranged behind one another on the same axis allowing for several tuned circuits to be adjusted using the same control e g a preselector an input filter and the corresponding oscillator in a receiver circuit the sections can have identical or different nominal capacitances e g 2 330 pf for am filter and oscillator plus 3 45 pf for two filters and an oscillator in the fm section of the same receiver capacitors with multiple sections often include trimmer capacitors in parallel to the variable sections used to adjust all tuned circuits to the same frequency butterfly a butterfly capacitor is a form of rotary variable capacitor with two independent sets of stator plates opposing each other and a butterfly shaped rotor arranged so that turning the rotor will vary the capacitances between the rotor and either stator equally butterfly capacitors are used in symmetrical tuned circuits e g radio frequency rf power amplifier stages in push pull output push pull configuration or symmetrical antenna tuner s where the rotor needs to be cold i e connected to rf but not necessarily direct current dc ground electricity ground potential since the peak rf current normally flows from one stator to the other without going through wiper contacts butterfly capacitors can handle large resonance rf currents e g in loop antenna magnetic loop antennas in a butterfly capacitor the stators and each half of the rotor can only cover a maximum angle of 90 since there must be a position without rotor stator overlap corresponding to minimum capacity therefore a turn of only 90 covers the entire capacitance range split stator the closely related split stator variable capacitor does not have the limitation of 90 angle since it uses two separate packs of rotor electrodes arranged axially behind one another unlike in a capacitor with several sections the rotor plates in a split stator capacitor are mounted on opposite sides of the rotor axis while the split stator capacitor benefits from larger electrodes compared to the butterfly capacitor as well as a rotation angle of up to 180 the separation of rotor plates incurs some losses since rf current has to pass the rotor axis instead of flowing straight through each rotor vane differential differential variable capacitors also have two independent stators but unlike in the butterfly capacitor where capacities on both sides increase equally as the rotor is turned in a differential variable capacitor one section s capacity will increase while the other section s decreases keeping the sum of the two stator capacitances constant differential variable capacitors can therefore be used in capacitive potentiometer potentiometric circuits return to variable capacitor retrieved from https en wikipedia org wiki variable_capacitor privacy policy about wikipedia disclaimers contact wikipedia legal safety contacts code of conduct developers statistics cookie statement mobile view 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