Hi Bakis

Like you say, I was expecting the attenuator knob to give me 0 to 2x amplification, but it gives only 0 to 1x.

With offset at around 1 o'clock position (0V offset), +4V in, switch in attenuator mode and att. knob at 10 I get +v4V out.

Rich

--- In Doepfer_a100@yahoogroups.com , Bakis Sirros <synth_freak_2000@...> wrote:
>
> the A183-2 is an attenuator/polarizer and offset generator.(and a x2 amplifier)
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> so, you say you want to make a +4volts input into a +4 to -4volts output, right
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> so: you have set the JP3 jumper as dieter says (and now the offset knob gives you -5 to +5 volts offset), and have you set the switch to 'attenuator' position this will give you a 0 - +2 amplification (0 - +8Volts output, from your input), if you set the 'attenuation' knob to the '10' position and the offset knob will take care of the negative offset you want (-4volts). for this you will have to set the offset knob to about the '1' position.
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> ok
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> does it work now
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>
> Bakis Sirros - Parallel Worlds / Interconnected / Memory Geist
>
> 1 group owner
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> www. parallel - worlds - music. com
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> www. myspace. com/ interconnectedmusic
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> www. DiN. org. uk
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>
> --- On Fri, 10/29/10, Richard Horsman <richyho@...> wrote:
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> From: Richard Horsman <richyho@...>
> Subject: AW: 1 A-183-2 suitable for this
> To: Doepfer_a100@yahoogroups.com
> Date: Friday, October 29, 2010, 9:19 PM
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> OK, so I bought one of these, moved the jumper but can't get the 2x amplification as mentioned here ( http://www.doepfer.de/a1832.htm) :
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> "The amplification range for the input will be probably 0...+2 in the attenuator mode, and -2...+2 in the polarizer mode, i.e. the maximum amplification will be x2 and the module can be used also to amplify CV or audio signals"
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> In my example of +4V being the input voltage, that is the max voltage measured at the outputs trying all positions of knobs and switch.
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> Please can you let me know where I'm going wrong.
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> Thanks
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> > Hi all/Dieter
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> >
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> > I have a module that puts out voltages in the range 0 to +4V. I
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> > would like to offset and amplify this voltage range to -4 to +4V
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> > (that is amplify x2 and offset by -4V).
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> > Is this the right module to do this job
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> > Thanks
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> >
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> > Richard
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> Yes, but you have to change the position of the JP3 jumper. The factory
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> setting is 0...+5V offset (upper position of the jumper). You have to change
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> it to the lower position (-5V...+5V offset).
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> Best wishes
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> Dieter Doepfer
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