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Re: [Doepfer_a100] Re: A-142 VC Decay - Useable Area too Small

2009-12-29 by Florian Anwander

Hello Dan,

another idea came to my mind: you can modify the characteristics of a 
potentiometer by adding on one side of the potentiometer a paralleled 
fixed resistor. There is a nice small application by christoffer list, 
which explains this nicely
http://www.mindspring.com/~clist/PotGraph.html

You will get an quasi logarithmic behaviour if the parralleled resistor 
is 5kOhm. This might affect also other characteristics of the overall 
circuit (I cannot judge from here, since I have the Servicemanual at 
home), but it won't damage the module.

Florian

leftbrain2002 schrieb:
> Thanks Florian,
> 
> Mine has a 50K pot on it so assume it's normal.  I am trying to shorten and VC the gates from a Modcan sequencer whose gates don't get short enough on shortest setting on the seq.  Perhaps the A-142 is designed to extend the lengths of super short triggers where as mine are already slightly long gates.  I can only shorten them by barely any threshhold settings with all pots at 0. CV to make the gates slightly longer must be done with the Cv pot barely above 0.   
> 
> Must try other options or premodify the incoming gates.
> 
> Dan
> 
> 
> 
> --- In Doepfer_a100@yahoogroups.com, Florian Anwander <fanwander@...> wrote:
>> Hi Dan,
>>
>> can you tell us, what is written on the decay potentiometer? It should 
>> be 50kB or 54B.
>>
>> How does the decaytime react if you use an external CV?
>>
>> Florian
>>
>> leftbrain2002 wrote:
>>> My A-142 bothers me because the only range of short envelopes are all in the first few degrees from all the way down.  As soon as I get up a bit, the envelopes are a few minutes long and can't even imagine the lenghths at 6 o'clock.  I don't see any jumpers to change the range levels but wonder if this is how it's made or if there's something wrong with mine.
>>>
>>> Dan
>>> http://www.REwireMusic.com
>>>
>>>
>>>
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>>>
> 
> 
> 
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