Gimmick capacitor

A gimmick capacitor is a capacitor made by twisting two pieces of insulated wire together. The capacitance may be varied by loosening or tightening the winding, making it a variable capacitor.[1] The capacitance can also be reduced by shortening the twisted pair by cutting. The available capacitance is on the order of 1pF/inch (0.4 pF/cm). [2]

Refs

  1. ^ Siddiqui, Mga (2024). "Basic components: capacitor types". Comprehensive review of the electronics (analog, digital, microprocessor). New Delhi: BlueRose Publishers. pp. 22–23. Gimmick capacitors are constructed by twisting together two insulated wires. Each wire forms a capacitor plate. Gimmick capacitors are also a sort of variable capacitor. Twisting and untwisting the two wires produces negigible (20% or less) variations in capacitance.
  2. ^ "... twisted-pair wire makes an excellent variable capacitor, sometimes called a gimmick" Pease, Robert A. (1991). Troubleshooting Analog Circuits (1st ed.). Butterworth-Heinemann. p. 22. ISBN 0-7506-9184-0.
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