hi Rich,
first of all: offset knob at '1' position (the 1 according to the scale that is marked on the module front panel) should give you -4 volts offset, not 0volts.
now, the a183-2 module should give x2 amplification, according to specs...
Dieter?
Bakis Sirros - Parallel Worlds / Interconnected / Memory Geist
[Doepfer_a100] group owner
www. parallel - worlds - music. com
www. myspace. com/ parallelworldsmusic
www. myspace. com/ interconnectedmusic
www. myspace. com/ memorygeist
www. DiN. org. uk
www. musicamaximamagnetica. com
www. vu-us. com
--- On Fri, 10/29/10, richyho@btopenworld.com <richyho@virginmedia.com> wrote:
From: richyho@btopenworld.com <richyho@virginmedia.com>
Subject: Re: [Doepfer_a100] A-183-2 suitable for this?
To: Doepfer_a100@yahoogroups.com
Date: Friday, October 29, 2010, 10:14 PM
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)
>
> so, you say you want to make a +4volts input into a +4 to -4volts output, right?
>
> 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.
>
> ok?
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> does it work now?
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>
>
> Bakis Sirros - Parallel Worlds / Interconnected / Memory Geist
>
> [Doepfer_a100] group owner
>
> www. parallel - worlds - music. com
>
> www. myspace. com/ parallelworldsmusic
>
> www. myspace. com/ interconnectedmusic
>
> www. myspace. com/ memorygeist
>
> www. DiN. org. uk
>
> www. musicamaximamagnetica. com
>
> www. vu-us. com
>
> --- On Fri, 10/29/10, Richard Horsman <richyho@...> wrote:
>
> From: Richard Horsman <richyho@...>
> Subject: AW: [Doepfer_a100] A-183-2 suitable for this?
> To: Doepfer_a100@yahoogroups.com
> Date: Friday, October 29, 2010, 9:19 PM
>
>
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> Â
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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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> >
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> > Is this the right module to do this job?
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> >
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> > Thanks
>
> >
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> > Richard
>
>
>
> Yes, but you have to change the position of the JP3 jumper. The factory
>
> 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
>
> Dieter Doepfer
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[Non-text portions of this message have been removed]Message
Re: [Doepfer_a100] A-183-2 suitable for this?
2010-10-29 by Bakis Sirros