Doepfer

-------------- Original message ----------------------

From: "selfoscillate" <synaptic_music@yahoo.com>
> the a155 inputs can handle up to +12v without any damage.
> 
> best wishes
> 
> ingo

oops, you're correct  Ingo, I guess I originally misread this message from Dieter, and it's always stuck in my head that it was  8V, glad to know that's not the case.:

Fri Jul 7, 2006
As long as the voltages applied to any socket are within -12V...+12V we
guarantee that nothing can be damaged within the A-100. But even voltages
beyond these limits will not damage most of the inputs (e.g. audio inputs
and CV inputs with attenuators). But there is one exception: inputs and
outputs of modules that use voltage controlled switches (e.g. A-150, A-151,
A-152, A-154, A-155, A-148), older versions of A-150 and A-151
(max. -8V...+8V), and CV or audio inputs without attenuators. For these
in/outputs the voltages applied should be within -12V...+12V.

Best wishes
Dieter Doepfer

> oops, you're correct Ingo, I guess I originally misread this
> message from Dieter, and it's always stuck in my head that it was
> 8V, glad to know that's not the case.:
>
> Fri Jul 7, 2006
> As long as the voltages applied to any socket are within -12V...+12V we
> guarantee that nothing can be damaged within the A-100. But even voltages
> beyond these limits will not damage most of the inputs (e.g. audio inputs
> and CV inputs with attenuators). But there is one exception: inputs and
> outputs of modules that use voltage controlled switches (e.g.
> A-150, A-151, A-152, A-154, A-155, A-148), older versions of A-150 and
A-151
> (max. -8V...+8V), and CV or audio inputs without attenuators. For these
> in/outputs the voltages applied should be within -12V...+12V.

I have to correct my above statement. For the A-155 the allowed voltage
range for the external A-155 CV/audio inputs is -5...+12V (not -8...+8V).
The -8V...+8V are valid only for the old versions of A-150, A-151 and A-148.
The A-152 already uses the new multiplexers that allow a -12V...+12V voltage
range. And the A-154 uses no voltage controlled switches with external
access. Sorry for the confusions ...

Best wishes
Dieter Doepfer

hello dieter,
so, that means that if i connect a voltage in the
range of +12 to -12 volts, the a155 switching function
will just not work? or there is danger of damaging the
a155?
best regards,
Bakis.


--- hardware@doepfer.de wrote:

> > oops, you're correct Ingo, I guess I originally
> misread this
> > message from Dieter, and it's always stuck in my
> head that it was
> > 8V, glad to know that's not the case.:
> >
> > Fri Jul 7, 2006
> > As long as the voltages applied to any socket are
> within -12V...+12V we
> > guarantee that nothing can be damaged within the
> A-100. But even voltages
> > beyond these limits will not damage most of the
> inputs (e.g. audio inputs
> > and CV inputs with attenuators). But there is one
> exception: inputs and
> > outputs of modules that use voltage controlled
> switches (e.g.
> > A-150, A-151, A-152, A-154, A-155, A-148), older
> versions of A-150 and
> A-151
> > (max. -8V...+8V), and CV or audio inputs without
> attenuators. For these
> > in/outputs the voltages applied should be within
> -12V...+12V.
> 
> I have to correct my above statement. For the A-155
> the allowed voltage
> range for the external A-155 CV/audio inputs is
> -5...+12V (not -8...+8V).
> The -8V...+8V are valid only for the old versions of
> A-150, A-151 and A-148.
> The A-152 already uses the new multiplexers that
> allow a -12V...+12V voltage
> range. And the A-154 uses no voltage controlled
> switches with external
> access. Sorry for the confusions ...
> 
> Best wishes
> Dieter Doepfer
> 
> 


Bakis Sirros - Parallel Worlds
[Doepfer_a100] group owner
http://www.parallel-worlds-music.com
http://www.myspace.com/parallelworldsmusic
http://www.shimarecords.co.uk
http://www.rubber.gr
Athens-Greece


 
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> hello dieter,
> so, that means that if i connect a voltage in the
> range of +12 to -12 volts, the a155 switching function
> will just not work? or there is danger of damaging the
> a155?
> best regards,
> Bakis.

There is some chance that a voltage more negative than -5V will destroy the
multiplexer circuit of the A-155 (but normally it will clip only). Within
the A-100 a negative voltage in this range can be generated only in a very
complicated way, e.g. by inverting a positive voltage beyond +5V. Since the
A-155 is available (i.e. nearly 10 years) we never had a fault caused by a
negative voltage at the external inputs.

Best wishes
Dieter Doepfer

hello Dieter,
ok, thank you for the info!
during my patching i do all kinds of crazy things with
CV's (who does not?)and there is real chance that
negative voltage beyond 5 volts could be generated.
ok, i just hope that the a155 can stand it...   :-)
best regards,
Bakis.


--- hardware@doepfer.de wrote:

> > hello dieter,
> > so, that means that if i connect a voltage in the
> > range of +12 to -12 volts, the a155 switching
> function
> > will just not work? or there is danger of damaging
> the
> > a155?
> > best regards,
> > Bakis.
> 
> There is some chance that a voltage more negative
> than -5V will destroy the
> multiplexer circuit of the A-155 (but normally it
> will clip only). Within
> the A-100 a negative voltage in this range can be
> generated only in a very
> complicated way, e.g. by inverting a positive
> voltage beyond +5V. Since the
> A-155 is available (i.e. nearly 10 years) we never
> had a fault caused by a
> negative voltage at the external inputs.
> 
> Best wishes
> Dieter Doepfer
> 
> 


Bakis Sirros - Parallel Worlds
[Doepfer_a100] group owner
http://www.parallel-worlds-music.com
http://www.myspace.com/parallelworldsmusic
http://www.shimarecords.co.uk
http://www.rubber.gr
Athens-Greece


 
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