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 Forum index » DIY Hardware and Software
any linear (not 1v/oct) vco schematics around???
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loss1234



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PostPosted: Sun Jun 01, 2008 10:35 am    Post subject: any linear (not 1v/oct) vco schematics around??? Reply with quote  Mark this post and the followings unread

looking to build a linear vco and was wondering if a linear PITCH input is the same as a Linear FM input. I know the expo FM input is NOTHING like the 1/v oct input so i figure i need to find a vco with an actual linear pitch input (1v/hz)


anyway, if anybody knows of an easy one, i would really appreciate it.
this is going to be a self contained keyboardless project so expo is not necessary and would just be more work i presume.


thanks!!

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Pehr



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PostPosted: Sun Jun 01, 2008 1:16 pm    Post subject: Reply with quote  Mark this post and the followings unread

how abt:
Posted Image, might have been reduced in size. Click Image to view fullscreen.
Confused

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loss1234



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PostPosted: Sun Jun 01, 2008 1:24 pm    Post subject: Reply with quote  Mark this post and the followings unread

that guy is linear? cool. i have built other parts of that project with sucess before, the VCA and the filter.
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PostPosted: Sun Jun 01, 2008 11:17 pm    Post subject: Reply with quote  Mark this post and the followings unread

loss1234 wrote:
that guy is linear? cool. i have built other parts of that project with sucess before, the VCA and the filter.


yes, there is no exponential converter in that osc Smile

How does the VCA and VCF work? are they good? did you use the LM3900? or any replacement?

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loss1234



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PostPosted: Mon Jun 02, 2008 3:49 am    Post subject: Reply with quote  Mark this post and the followings unread

you have to use an lm3900

as far as i know

are there any other norton opamps??

but the vca was pretty good and the filter was good if i remember. this was back when i first started making stuff.

but wilsons stuff is always great!!

thanks


i am also messing with some of the linear designs from the vco cookbook

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JovianPyx



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PostPosted: Mon Jun 02, 2008 6:47 am    Post subject: Reply with quote  Mark this post and the followings unread

The FatMan VCO is linear. You can see the schematic at http://www.paia.com. I've built the LM13600 triangle VCO in the LM13600 data sheet. It works quite well in a FatMan. Then there is my adaptation of Rene Schmitz 4069UB VCO (saw), my adaptation replaced the expo V-I converter with a linear one - see http://home1.gte.net/res0658s/fatman/VCO_pwm_tri_suboctave.html the schematic also includes a triangle/sine waveshaper and suboctave. Note that the FatMan stock VCO uses a 555 timer - I would not use the bipolar version, I'd use a CMOS 7555 instead.
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Sound



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PostPosted: Mon Jun 02, 2008 9:38 am    Post subject: Re: any linear (not 1v/oct) vco schematics around??? Reply with quote  Mark this post and the followings unread

loss1234 wrote:
looking to build a linear vco and was wondering if a linear PITCH input is the same as a Linear FM input.


Hi Loss, I think that it is the same.
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Blue Hell
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PostPosted: Mon Jun 02, 2008 11:01 am    Post subject: Re: any linear (not 1v/oct) vco schematics around??? Reply with quote  Mark this post and the followings unread

Sound wrote:
loss1234 wrote:
looking to build a linear vco and was wondering if a linear PITCH input is the same as a Linear FM input.


Hi Loss, I think that it is the same.


Sometimes there is a capacitor after the control input, not unusual for FM inputs. Maybe that is the difference with linear pitch control?

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eyehue



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PostPosted: Mon Jun 02, 2008 9:59 pm    Post subject: Reply with quote  Mark this post and the followings unread

the MFOS VCO appears to have a Linear CV input:

http://www.musicfromouterspace.com/analogsynth/VCO200604REV01/VCO200604REV01.html

http://www.musicfromouterspace.com/analogsynth/VCO200604REV01/vcopaneloverlay.gif
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loss1234



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PostPosted: Fri Jun 06, 2008 5:01 am    Post subject: Reply with quote  Mark this post and the followings unread

its a linear FM input. i think there must be a difference. I breadboarded a simple 566 vco with linear cv input (NO CAP)

and then i compared that to the LINEAR FM input on my Ray Wilson VCO. they sounded and acted very differently. I THINK linear FM is more for FM effects. (clanging,etc) and this is why the 1v/oct input sounds different from the expo FM input also.

anyone know more about FM inputs versus regular Cv inputs
i still need to get a scope to test this out more but I think LINEAR CV input is different than LINEAR FM input.


also, does anyone know if there is any real difference between v/khz and plain old linear?? anyone know the standard amount of hz per volt in a regular linear signal? maybe v/khz is slightly more precise than plain linear?

thanks all

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Blue Hell
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PostPosted: Fri Jun 06, 2008 12:20 pm    Post subject: Reply with quote  Mark this post and the followings unread

a Hz/V scale is linear and and Octave/V scale is exponential, there is no sense in qualifying these with the word 'plain' ... that is ... I don't see it Wink That being said, a cheap oscillator will not have a perfect scale most likely.

FM on a square wave osc sounds very different from FM on a sine wave, not because its a different type of FM but because of the different wave forms used.

The amount of FM, or modulation depth, used is very important for the sound, the sound will go into noise for deep FM. The actual frequencies involved are very important for FM as well.

Although the material was written with the G2 in mind I think Rob Hordijk's website has some good information about several synthesis related subjects, FM being one of 'm.

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loss1234



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PostPosted: Fri Jun 06, 2008 12:28 pm    Post subject: Reply with quote  Mark this post and the followings unread

thanks
to be honest i am not trying to do FM..i am trying to do linear pitch, or volt to khz

i am trying to control a linear osc with linear CV because that seems to be better for the littlze gizmo i am building (a noisemaker really, no need for expo conversion,etc)

thanks for all the info!!

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