[sdiy] Sourcing a 2.5 Meg reverse log potentiometer (Moog Prodigy)

[Mattias Rickardsson]

On 10 October 2013 00:29, Veronica Merryfield <veronica at merryfield.ca> wrote:
> You can turn a linear pot into a log pot with the addition of a resistor from the output to one end of the wiper.

When the pot gets scratchy - i.e., the resistance between the wiper
and the resistive track fluctuates when turned or even when still -
then this solution is said to give more problems with unwanted noise
since much more current is drawn through the wiper. Current through
the fluctuating resistance gives a fluctuating voltage, a.k.a. noise,
to your signal.

But ah, since it's the LFO rate, it's probably not that critical
though. I expected it to be the resonance pot. :-)

/mr



On 10 October 2013 10:01, Maarten Halmans <diy at artefacts.nl> wrote:
> Banzai has 3M reverse log cts pots:
> http://www.banzaimusic.com/CTS-Pot-3M-REVERSE-log.html
>
>
> ----- Original Message ----- From: "The Laboratory of Sound"
> <info at labofsound.com>
> To: "synth-diy" <synth-diy at dropmix.xs4all.nl>
> Sent: Wednesday, October 09, 2013 9:04 PM
> Subject: [sdiy] Sourcing a 2.5 Meg reverse log potentiometer (Moog Prodigy)
>
>
>
>> Dear all,
>>
>> I am having the hardest time finding a 2.5 Meg ccw audio/reverse log
>> potentiometer, preferably with a 1/4" or 6.3 mm D type shaft. I need it to
>> repair the LFO rate of a Moog Prodigy (someone replaced the 2.5 Meg with a
>> 100 K pot so that it can only produce fast rates). Any help would be greatly
>> appreciated.
>>
>> Cheers,
>>
>> Jack
>>
>> --
>> The Laboratory of Sound
>> Duivenvoordestraat 28
>> 2341 JE Oegstgeest
>> The Netherlands
>>
>> T +31 71 517 0230
>>
>> www.labofsound.com
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