Two-slider Crystal Radio

Chapman & Chapman; Dublin

  • Year
  • 1915 ??
  • Category
  • Detector-Radio (Crystal or diode, without tubes/transistors)
  • ID
  • 347271

 Technical Specifications

  • Main principle
  • Crystal or Solid State Detector
  • Wave bands
  • Long Wave and/or Very Low Frequency (VLF).
  • Power type and voltage
  • No Power needed
  • Loudspeaker
  • - For headphones or amp.
  • Material
  • Various materials
  • from
  • Model: Two-slider Crystal Radio - Chapman & Chapman; Dublin
  • Shape
  • Tablemodel, with any shape - general.
  • Dimensions (WHD)
  • 280 x 160 x 160 mm / 11 x 6.3 x 6.3 inch
  • Notes
  • Two-slider Crystal Radio

    A popular circuit used in simple crystal radios made before 1920. To tune in different stations, it used a tuning coil with two sliding contacts. No capacitor is necessary as the coil resonates with the capacitance of the long wire antenna to create a tuned circuit.

    One slider tunes the receiver to different stations. The other slider adjusts the impedance match between the antenna and the rest of the circuit, to maximize the power transferred from the antenna into the receiver. It is adjusted until the station sounds loudest in the earphone connected to the two terminals on the left.

    In the example shown the knob on the left is possibly a capacitor connected across the coil to aid in more precise tuning in conjunction with the sliders.


  • Net weight (2.2 lb = 1 kg)
  • 2.2 kg / 4 lb 13.5 oz (4.846 lb)

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The model Two-slider Crystal Radio is part of the collections of the following members.