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

does it work now




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--- On Fri, 10/29/10, Richard Horsman < richyho@... > wrote:

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







 









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) :



"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"



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.



Please can you let me know where I'm going wrong.



Thanks



> Hi all/Dieter

>

> I have a module that puts out voltages in the range 0 to +4V. I

> would like to offset and amplify this voltage range to -4 to +4V

> (that is amplify x2 and offset by -4V).

>

> Is this the right module to do this job

>

> Thanks

>

> 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

it to the lower position (-5V...+5V offset).



Best wishes

Dieter Doepfer



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