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Doepfer

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Re: Adding CV to A-145 LFO

Re: Adding CV to A-145 LFO

2001-08-02 by ethanzer0@yahoo.com

> :-), but first figure out the voltage etc.
> KRIS

Thanks for the pointers :-)

Ethan

RE: [Doepfer_a100] Re: Adding CV to A-145 LFO

2001-08-02 by Rhen, Kris

> --- In Doepfer_a100@y..., "Rhen, Kris" <krhen@s...> wrote:
> > Actually in theory, any analog circuit which has a pot can be 
> > changed to CV control.  All a pot is is a voltage divider, so 
> > applying the proper voltave across the divider has the same 
> > effect.  I'm considering lots of mods to my
> 
> Do you know if the voltage that passes through the pot is the same as 
> the output of the A-145 LFO?  Would I have to convert the the input 
> to the proper voltage, or could I just wire a jack in place of the 
> pot? or even use the pot as a CV attenuator...

They don't really have to be related in any way (Vpot = VlFOoutput and most
likely not).  Put a voltmeter across it and turn the pot to the min and max.
Should give you an idea of what voltage is being used (typically they're
taken from the +12v or across the +-12v sources but its hard to say without
the schematic.  Yep you could use the pot as an attenuator and that's a
really good idea actually (put the jack as the input tothe divider instead
of whatever fixed voltage source is used - but then you'll always have to
use a CV unless you put a little switch in as well to switch between CV and
normal voltage source - or normalize it but that's another issue entirely
:-), but first figure out the voltage etc.
KRIS


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