Help with reading a circuit

Discussion in 'The Projects Forum' started by hrs, Apr 18, 2015.

  1. hrs

    Thread Starter Member

    Jun 13, 2014
    82
    7
    Hi,

    I would like to make a sine wave generator as described here:
    http://www.bobsdata.com/audio_sine_wave_generator/index.html
    What I dont understand from the schematic is how the dual potmeter (R5) is connected. Are the 3rd terminals of each channel of the potmeter connected to each other via the dashed line or something like that?
     
  2. Dodgydave

    Distinguished Member

    Jun 22, 2012
    4,998
    745
  3. djsfantasi

    AAC Fanatic!

    Apr 11, 2010
    2,810
    834
    No. The third terminals are left disconnected. The dashed line indicates that R5 is a dual pot.
     
  4. MrChips

    Moderator

    Oct 2, 2009
    12,447
    3,363
    What is shown is called a "ganged pair of pots" or "ganged pots". There is no electrical connection between the pots. The purpose of the dashed lines is to indicate that they share a common shaft. The two pots are mounted on the same shaft so that the control knob turns both pots equally at the same time.

    A common usage of ganged pots is in the volume and tone controls of stereo audio amplifiers.
     
  5. hrs

    Thread Starter Member

    Jun 13, 2014
    82
    7
    Ah, of course! Thank you :)
     
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