All About Circuits Forum CD4046 & NE566
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#1
04-26-2009, 05:43 PM
 onlyvinod56 Senior Member Join Date: Oct 2008 Location: hyderabad, india Posts: 348 Blog Entries: 1
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
#2
04-26-2009, 06:26 PM
 bertus Administrator Join Date: Apr 2008 Location: Amsterdam,Holland (GMT + 1) Posts: 12,286

Hello,

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

Greetings,
Bertus
Attached Files
 ne566.pdf (50.2 KB, 47 views) CD4046.pdf (326.0 KB, 42 views)
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#3
04-27-2009, 12:12 PM
 onlyvinod56 Senior Member Join Date: Oct 2008 Location: hyderabad, india Posts: 348 Blog Entries: 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
Attached Images
 untitled.JPG (36.8 KB, 47 views)
#4
04-27-2009, 05:25 PM
 bertus Administrator Join Date: Apr 2008 Location: Amsterdam,Holland (GMT + 1) Posts: 12,286

Hello,

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

Greetings,
Bertus
__________________
You don't have to know everything, if you know where to find it.
When you do ask questions, you may look stupid.
When you do NOT ask questions, you will STAY stupid.

It would be nice to have the Timezone ( GMT +/- x ) in the location field in the profile.
(User CP -> Edit Your Details)

 Tags cd4046, ne566

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