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  #1  
Old 04-26-2009, 05:43 PM
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onlyvinod56 onlyvinod56 is offline
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Smile CD4046 & NE566

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
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Old 04-26-2009, 06:26 PM
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bertus bertus is offline
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Hello,

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

Greetings,
Bertus
Attached Files
File Type: pdf ne566.pdf (50.2 KB, 47 views)
File Type: pdf CD4046.pdf (326.0 KB, 42 views)
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Old 04-27-2009, 12:12 PM
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onlyvinod56 onlyvinod56 is offline
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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
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Old 04-27-2009, 05:25 PM
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bertus bertus is offline
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Hello,

Take a look at this thread: http://forum.allaboutcircuits.com/sh...ad.php?t=18409

In there you will find this picture for calculating the resistors and capacitor



Greetings,
Bertus
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