Re: [Doepfer_a100] A-183-2 suitable for this?
2010-10-29 by richyho@btopenworld.com
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:
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> > 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? > > > > > 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 > > > > > > > > Â > > > > > > > > > > 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 > > > > [Non-text portions of this message have been removed] > > > > > > > > > > > > > > > > > > > > > > > > > > [Non-text portions of this message have been removed] >