--- Dieter Doepfer < hardware@... > wrote:

> From: "Dieter Doepfer" < hardware@... >
> To: "Bakis Sirros" < synth_freak_2000@... >
> Subject: AW: 1 Re: Updating the a-120
> (was: q's)
> Date: Wed, 25 Aug 2004 13:25:23 +0200
>
>
> > > Which resistor needs to be changed, from what
> value, to what value
> > >
> > > I would very much like to experiment with my old
> a120.
> >
> >
> > hello julian,
> >
> > don't know exactly. i think that dieter doepfer
> can tell us.
> > maybe he is reading this and can give some
> details.
> >
> > best wishes
> >
> > ingo
>
> These are the resistors for the first filter modules
> that determine the
> input level resp. distortion feature:
>
> module resistor factory value location
> A-120 R15 22k just behind the audio level
> control
> A-121 R1 220k just behind the audio level
> control
> A-122 R1 100k just behind the audio level
> control
>
> Reducing the resistance causes a higher level (e.g.
> dividing the resistance
> value by 2 causes to double the audio level, e.g.
> 10k for R15 of A-120
> doubles about the level) and may generate distortion
> for high input levels.
>
> We are about to add some information how to
> increase/decrease the
> sensitivity of audio inputs, control inputs and
> manual controls (e.g. VCO
> tune, filter frequency) to the DIY page. It is
> always a simple resistor that
> has to be changed.
>
> Normally the basic inverting opamp circuit is used
> to add several voltages
> (essentially the "CV mixer" in the DIY document). By
> altering the values of
> R1, R2, R3 and R4 the sensitivity of the inputs In1
> ... In4 can be changed.
>
> Best wishes
> Dieter Doepfer
>
>

=====
Bakis Siros
Parallel Worlds / Polariton
Athens-Greece
1 group owner
http://www.shimarecords.co.uk
http://www.ward12.com



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