CD4046 & NE566

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

  1. onlyvinod56

    onlyvinod56 Thread Starter Active Member

    Joined:
    Oct 14, 2008
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    Location:
    hyderabad, india
    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

    bertus Administrator Staff Member

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    Amsterdam,Holland (GMT + 1)
    Hello,

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

    Greetings,
    Bertus
     

    Attached Files:

  3. onlyvinod56

    onlyvinod56 Thread Starter Active Member

    Joined:
    Oct 14, 2008
    Messages:
    353
    Location:
    hyderabad, india
    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
     

    Attached Files:

  4. bertus

    bertus Administrator Staff Member

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