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 Forum index » DIY Hardware and Software
Controlling VCOs
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Scott013



Joined: Aug 16, 2005
Posts: 32
Location: Canada

PostPosted: Fri Nov 25, 2005 12:18 pm    Post subject: Controlling VCOs Reply with quote  Mark this post and the followings unread

I don't really understand voltage controlled osciallators, I don't know how exactly they are controlled. Can any keyboard be used with a VCO or do you need to build/order something special (that's what I'm guessing). I think I have also seen MIDI to CV converters, are they very good? Would you recomend any?

Thanks!
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zipzap



Joined: Nov 22, 2005
Posts: 559
Location: germany
Audio files: 24

PostPosted: Sat Nov 26, 2005 2:12 am    Post subject: Reply with quote  Mark this post and the followings unread

Hi
A oscilator is a circuit that produces a certain waveform at a certain frequency. you can have osc with fixed frequency/waveform, for example a quarz-osc for the clock signal in a quarz-watch.
a vco has an input for frequency controll. Depending on the voltage on that input the pitch goes up or down.
In well build vcos an increasment of 1v on the input will cause tihe frequency to double (=1 octave).
in all of my vcos it doesn´t...
midi wont work here, its just digital code. it has to be transformed, using a midi-cv converter. eg doepfer, kenton. if you only want to play your synth a simple one with 1cv and 1 gate (to trigger adsr) outs is enough.
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dnny



Joined: Mar 12, 2005
Posts: 519
Location: Helsinki, Finland
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PostPosted: Sat Nov 26, 2005 5:15 am    Post subject: Re: Controlling VCOs Reply with quote  Mark this post and the followings unread

Scott013 wrote:
Can any keyboard be used with a VCO or do you need to build/order something special (that's what I'm guessing).


only keyboards that output CV can be used.
or CV outputting sequencers, or any voltage source that outputs 0-10V
(so most analog light controllers can be used...etc.)

try some of thease
16 Channel Analog Sequencer
One Octave Pedal Board or Stylus Keyboard
Matrix Encoded 1V/Octave Keyboard
MIDI to Control Voltage Convertor
Single Bus Keyboard to 1V/Oct CV, Gate, Trigger

hope this helps
daniel

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