[sdiy] power bus decoupling (?) on a modular

Anthony Rolando goldenechos at hotmail.com
Wed Sep 19 22:16:16 CEST 2007


For $40.00 it looks like Plan B sells a power distro board that has all that 
you are seeking (you should get Peter's confirmation on this of course):

http://www.ear-group.net/model_1.html

Might be worth it, save yourself the hassle.

Tony




>From: "Julian" <julian at 22host24.com>
>To: <synth-diy at dropmix.xs4all.nl>
>Subject: [sdiy] power bus decoupling (?) on a modular
>Date: Wed, 19 Sep 2007 14:17:39 +0100
>
>I think ive kind of asked this question before, but, it appears, am still 
>unsure -
>
>I have a modular thats mainly made up of doepfer components.  The 
>interference between the modules is really quite poor (for example pitch 
>instabilities of a vco when placed on the same bus as an lfo)
>
>I understand that they should be decoupled (is that the right term?) on the 
>modules, but, evidently, this isnt working as well as id desire.
>
>The power busses on the system are just physical connectors.  No capacitors 
>etc. on them at all.
>
>I have already increased the gauge of the ground bus (tinned copper wire 
>along the rear) and made sure it has good connection to the linear psu, but 
>it hasnt made a lot of difference.
>
>I vaguely understand that the next step forward would be to have a couple 
>of large electrolytics on the bus, between the power rails and ground, at 
>one (why not both?) ends, and then smaller electrolytics or tantalums 
>(which?) between each module connector.
>
>Is this the right way to go about this, and, if so, what values should i be 
>looking at?
>
>Thanks, Julian
>
>
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