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 Forum index » DIY Hardware and Software
PLL (CD4046) with linear VCO
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anders79



Joined: Jun 21, 2010
Posts: 21
Location: Sweden

PostPosted: Fri Aug 27, 2010 2:41 pm    Post subject: PLL (CD4046) with linear VCO Reply with quote  Mark this post and the followings unread

Hello everyone!

I am using a CD4046 PLL to track an incoming pulse-wave signal (from the VCO of a CSY-1 analog synth), in order to voltage control the frequency of this VCO:

http://yusynth.net/archives/ElectronicDesign/H-Malvar-linVCO-1980.pdf

The waveforms from the VCO is not very clean and stable, and I believe it is because the loop filter between the PLL and the VCO is not proberly configured.

Pin 13 from the CD4046 goes into the VCO input and the VCO square out goes into pin 3 (comparator input) of the CD4046.

Since the VCO has a conversion factor of 2 kHz/Volt (which is configurable according to the article), how do I choose the optimal component values for the loop-filter between the PLL and the VCO?

Should I change the conversion factor of the VCO?

regards Anders
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keyman2



Joined: Jul 16, 2013
Posts: 4
Location: Canada

PostPosted: Tue Jul 16, 2013 7:13 pm    Post subject: Re: PLL (CD4046) with linear VCO Reply with quote  Mark this post and the followings unread

I've used the similar 4046 VCO but in hard-sync mode to connect to the same CSY VCO in a CSY-2... works well and provides the classic sync'd sound. You can also manually or automatically control the PW on the PW modifier - hook it to the aftertouch or envelope etc.

Some further ideas..

https://sites.google.com/site/yamahacsy2synth/

anders79 wrote:
Hello everyone!

I am using a CD4046 PLL to track an incoming pulse-wave signal (from the VCO of a CSY-1 analog synth), in order to voltage control the frequency of this VCO:

http://yusynth.net/archives/ElectronicDesign/H-Malvar-linVCO-1980.pdf

The waveforms from the VCO is not very clean and stable, and I believe it is because the loop filter between the PLL and the VCO is not proberly configured.

Pin 13 from the CD4046 goes into the VCO input and the VCO square out goes into pin 3 (comparator input) of the CD4046.

Since the VCO has a conversion factor of 2 kHz/Volt (which is configurable according to the article), how do I choose the optimal component values for the loop-filter between the PLL and the VCO?

Should I change the conversion factor of the VCO?

regards Anders
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