CD4046 & NE566

Discussion in 'The Projects Forum' started by onlyvinod56, Apr 26, 2009.

  1. onlyvinod56

    Thread Starter Active Member

    Oct 14, 2008
    356
    1
    Hi,
    iam working with a project based on VCO.
    What is the range of contrl voltage that can be given to
    i) pin 9 of CD4046
    ii) pin 5 of NE566.

    required frequency range is [33KHz 336KHz]
    Thanq
     
  2. bertus

    Administrator

    Apr 5, 2008
    15,104
    2,156
    Hello,

    Do you have the datasheets?
    It should be possible with both.

    Greetings,
    Bertus
     
  3. onlyvinod56

    Thread Starter Active Member

    Oct 14, 2008
    356
    1
    Hello bertus,
    i have seen the datasheets. But i didnt understand this modulating voltage.
    anyways, Today morning i worked with CD4046.

    Iam attaching the schematic here.
    By varying the 50k pot, i got almost the correct result. the maximum frequency i got with this circuit is 333.33KHz. & minimum something around 10Khz.

    Next i removed the 50K pot. and i connected an external variable power supply to the pin 9 w.r.t ground. i started varying the voltage from 0v.
    As iam increasing the voltage 0, 0.1, 0.2,.... exactly at 0.3v iam not getting any thing except two horizontal lines in oscilloscope.

    what shud i do. I dont need pot. I have to control with external voltage.

    thanQ
     
  4. bertus

    Administrator

    Apr 5, 2008
    15,104
    2,156
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