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 Forum index » DIY Hardware and Software » Developers' Corner
linear VCO Schematic
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itist



Joined: Dec 30, 2013
Posts: 16
Location: Germany

PostPosted: Tue Dec 31, 2013 12:09 pm    Post subject: linear VCO Schematic Reply with quote  Mark this post and the followings unread

Hi,

here are two schematics with an LTSpice Simulation.
It looks goad at the first sight and i will build them on Breadboard and will do some real life measurements.

The graphic shows a linear sweep with an control voltage from 125mV to 1V

Here you can follow the progress..

http://itist.de/2013/12/2-linear-voltage-controlled-oscillators-vco/



Greetz

Oliver


VCO1.png
 Description:
VCO1 Schematic
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VCO1.png



VCO1 SAW output.png
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VCO1 SAW output
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VCO1 SAW output.png



VCO2 Schematic.png
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VCO2 Schematic
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VCO2 Schematic.png



VCO2 SAW output.png
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VCO2 SAW output
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VCO2 SAW output.png



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itist



Joined: Dec 30, 2013
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Location: Germany

PostPosted: Wed Jan 01, 2014 3:33 pm    Post subject: Breadboard Reply with quote  Mark this post and the followings unread

This is a picture of the two VCOs on breadboard.
Test Results comming soon...
more infos at:
http://itist.de/2013/12/2-linear-voltage-controlled-oscillators-vco/

Greetz

Oliver


20140101_184637.jpg
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Both VCOs on breadboard.
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20140101_184637.jpg



VCO2 500mV.jpg
 Description:
Output VCO2
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VCO2 500mV.jpg



VCO1 500mV.jpg
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Output VCO1
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VCO1 500mV.jpg



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tasteless



Joined: Feb 18, 2013
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Location: Australia

PostPosted: Thu Jan 02, 2014 7:57 am    Post subject: Reply with quote  Mark this post and the followings unread

Ooh , Nice work !
Definitely got My attention.
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itist



Joined: Dec 30, 2013
Posts: 16
Location: Germany

PostPosted: Thu Jan 02, 2014 10:51 am    Post subject: VCO Designs Reply with quote  Mark this post and the followings unread

tasteless wrote:
Ooh , Nice work !
Definitely got My attention.


Thanks,

i found another linear VCO its from the Korg Trident. Will transfer it into LT Spice and build on Breadboard too.i'll try to make a collection of VCO Designs.

Happy 2014

Greetz

Oliver

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itist



Joined: Dec 30, 2013
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PostPosted: Fri Jan 03, 2014 2:07 pm    Post subject: Build third VCO on Breadboard Reply with quote  Mark this post and the followings unread

Hi,
i have built the third VCO (Korg Style) on breadboard.

The simulation did not work but real life circuit runs.

more infos at:
http://itist.de/2013/12/2-linear-voltage-controlled-oscillators-vco/

Greetz
Oliver


VCO 3.jpg
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Waveform output breadboard
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VCO 3.jpg



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itist



Joined: Dec 30, 2013
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PostPosted: Sat Jan 04, 2014 4:56 pm    Post subject: Audio Samples on youutbe Reply with quote  Mark this post and the followings unread

Hi,
i uploaded a short video on youtube.
http://youtu.be/HtZ-OVa7F20



Greetz

Oliver

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acidblue



Joined: Jun 26, 2009
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PostPosted: Thu Jan 30, 2014 10:16 pm    Post subject: Reply with quote  Mark this post and the followings unread

What voltage are you using?
+12/-12, +15/-15 ?
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itist



Joined: Dec 30, 2013
Posts: 16
Location: Germany

PostPosted: Thu Jan 30, 2014 11:36 pm    Post subject: Supply Voltage Reply with quote  Mark this post and the followings unread

Hi,

i am using +15/-15V

Greetz

Oliver

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fantozzi



Joined: Jan 15, 2012
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PostPosted: Wed Feb 05, 2014 10:13 am    Post subject: Reply with quote  Mark this post and the followings unread

For your collection

simulated, breadboarded


linear npn.png
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linear npn.png



linear pnp.png
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