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c3lingo Unit -- Knobs and Switches

Detailed information why certain knobs (potentiometers) and switches were chosen.

Potentiometers

We need some single logarithmic scale potentiometers, which are matching in size, for:

  • top plate interface (all vertical style, threaded collar would be nice):
    • 1 50k single channel for the input gain
    • 3 50k single channel for the headphone mix
  • front plate next to the headset jacks (horizontal style, threaded collar not needed):
    • 1 50k single channel for the headphone volume

Possible knobs may be:

  • for D-style (6 mm diameter, flattened to 4.5 mm) and 18-teeth spline (6 mm diameter) axle:
    • (A) Re'an F311 series (11 mm diameter):
      Boring: 9.0 mm D-style hole + 0.0 mm nut cover section = 9.0 mm
  • for D-style (6 mm diameter, flattened to 4.5 mm) axle:
    • (B) Re'an P670 series (12 mm diameter/ 16 mm at bottom) (alt. Davies Molding 1101):
      Boring: 7.5 mm D-style hole + 4.5 mm nut cover section = 12.0 mm
      Nut cover: 12.9 mm diameter (M7 nut is 12.5 mm corner to corner)
    • (C) Re'an P300 series (11 mm diameter/ 15 mm at bottom):
      Boring: 9.0 mm D-style hole + 3.0 mm nut cover section = 12.0 mm
      Nut cover: ? mm diameter (M7 nut is 12.5 mm corner to corner)
  • for 18-teeth spline (6 mm diameter) axle:
    • (D) Davies Molding 1106-A (blue)/ 1106-WA (white) (13-18 mm diameter):
      Boring: 14.2 mm 18-teeth hole + 2.5 mm nut cover section = 16.7 mm
      Nut cover: ? mm diameter
    • (E) Davies Molding 1101-A (11 to 16 mm diameter):
      Boring: 8.0 mm 18-teeth hole + 4.1 mm nut cover section = 12.1 mm
      Nut cover: ? mm diameter

Vertical (pins on bottom):

Horizontal (shaft to the side):

  • D-type shaft:
    • Alps Alpine RK09K1110B1R:
      • axle 10 mm above PCB
      • no collar/ threads
      • 7.4 mm long D-style 6 mm diameter shaft (6 mm of which flattened)
      • A-taper (log) 50k
      • Datasheet: TODO
      • Knobs (see above): A

Selection:

  • Channel Mixer (input gain and mix):
    • CUI Devices PTN091-V50115K1A + Davies Molding 1106-A
  • Headphone volume:
    • RK09K1110B1R (single, 50K, 15 mm) + Re'an F311

Switches

The On-Air button needs to be a latching DPDT switch (TODO: not true any more, can also be single pole), ideally with LED illumination and max. 8 mm height (PCB to front plate), like:

  • E-Switch TL2230EEF140, no illumination -- 0.60 €
    DPDT, PCB mount
    Height: 7.0 mm + 5.5 mm plunger (2x3 mm cap terminal)
    Cap: see APEM models
  • APEM MHPS2273 (EU version: PHAP4673), no illumination, no audible click -- 0.41 €
    DPDT, PCB mount
    Height: 7.0 mm + 5.5 mm plunger (2x3 mm cap terminal)
    Cap: U542x (11.5 mm square, 4 mm height), U453x (9.4 mm dia., 6.65 mm height) -- 0.64 €
    Cap color codes: 2 Black, 4 Grey, 5 Yellow, 6 Red

The mute button needs to be a momentary SPST (normally open) or SPDT push button, like:

  • E-Switch TL2230OAF140, no illumination -- 0.53 €
    DPDT, PCB mount
    Height: 7.0 mm + 5.5 mm plunger (2x3 mm cap terminal)
    Cap: see APEM models
  • APEM 1413NC6/ 1415NC6 -- 3.72 €
    SPST/ SPDT, front plate snap-in mount, solder lugs
    Button size: 12 mm square, Color: Red (color code 6)
    Cap: U542x (11.5 mm square, 4 mm height), U453x (9.4 mm dia., 6.65 mm height) -- 0.64 €
    Cap color codes: 2 Black, 4 Grey, 5 Yellow, 6 Red
    Depth: 13 mm + 6 mm for contacts = 19 mm
  • NKK Switches LP0115C{C,M}KW01-C -- 7.91 €
    SPDT, front plate bushing/ snap-in mount, solder lugs
    Button size: 13.6 mm dia., Color: Red (color code C)
    Depth: 22 mm