EF Johnson 160-205 Miniature Butterfly Variable Capacitor: 1.8-5.1pF: NOS

Description:

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. RF power amplifier
stages in push-pull configuration or symmetrical antenna tuners where the rotor needs
to be “cold”, i.e. connected to RF (but not necessarily DC) 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 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

Specifications:

Capacitance: 1.8-5.1pF
Plate Spacing: .013”
Peak Voltage: 850V
Shaft Diameter: 3/16” (Slotted for screwdriver adjustment)
Bushing Diameter: 1/4"
Dimensions: 3/4" Wide x 5/8” High x 9/16” (Not including bushing or shaft)
Manufacturer: EF Johnson
Mfg. Part Number: 160-205

Listing is for one (1) piece. New in original box.

We always combine items to save you on shipping when possible.
Always request an invoice before paying when buying multiple items.

Be sure to check out our other Ebay listings.