> 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

Richard,

I took a look at an A-183-2 module taken from our shipping department. You
are right, the max. amplification is only ~ 1. I found the error: there is a
resistor R2 with a value 100K printed on the pcb. We changed the value of
this resistor later to 50k (47k) to obtain a maximal amplification of ~ 2
(but the silk screen on the pcv was not changed and still reads 100k).
Obviously the assembly company used the value 100k (printed on the pcb)
instead of the modified value 50k(47k) specified in the assembly documents.
I'm very sorry for this error and will instruct our assembly company to use
the correct value (50/47k) in the future.

If you are able to add a resistor there is a simple solution: solder another
100k resistor in parallel to the existing R2 on the bottom of the pcb. This
lowers the total value to 50k. R2 is located between the input socket and
the upper output socket.

Best wishes
Dieter Doepfer