CD4046 & NE566

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

  1. onlyvinod56

    onlyvinod56 Thread Starter Active Member

    Joined:
    Oct 14, 2008
    Messages:
    348
    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

    Joined:
    Apr 5, 2008
    Messages:
    12,454
    Location:
    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:
    348
    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

    Joined:
    Apr 5, 2008
    Messages:
    12,454
    Location:
    Amsterdam,Holland (GMT + 1)
Similar Threads
Forum Title Date
The Projects Forum PLL IC CD4046 help needed Jan 23, 2009
The Projects Forum FSK modulator using CD4046 plz help! Nov 28, 2007

Share This Page