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Power distibution in Bill and Will's medium size Synth

2007-02-19 by wjhall11

I was meandering through some of your sites, when I came across a
mention - I think it was on Richard Brewster's site - that he'd put
his Oscillators on one power supply to isolate them from some kind of
interference from other modules.  So I became concerned about how Will
and I have been planning our power distibution.  Here's how we've been
lanning it:

On a MOTM 900 - 

(1) MOTM 101  Noise/S&H
(1) MOTM 120  Sub Oct Multiplexer
(1) MOTM 190  VCR
(3) MOTM 300  Ultra VCO
(2) MOTM 310  Micro VCO
(1) MOTM 410  Triple Resonant Filter
(1) MOTM 420  VCF
(1) MOTM 440  Discreet OTA Lowpass Filter
(1) MOTM 480  CS REsonant Filter
(1) MOTM 495  VCF
(1) MOTM 490  Micro VCF
(1) MOTM 320  VC LFO
(1) MOTM 380  Quad LFO
(2) MOTM 390  Micro LFO

On a MOTM 950 -

(5) MOTM 800  EG Outfitted with Scott Juskiw's 800DBs and two LEDs each
(1) MTOM 510  Wave Warper (needs the 6pin connector)
(1) MOTM 700  Dual VC Router
(1) MOTM 800  Lag Processor
(1) MOTM 830  Dual Mode Mixer
(1) MOTM 650  Midi-DC Converter (needs the 6pin connector)
(1) MOTM 850  Pedal Interface


Now, according to my reconing - we should be within each of the power
supplies' load tolerance.  On the Synth tech site, Paul says the 900
can handle up to 20 Modules (I've specified 18).  Now Paul also says
that the 950 has 6 MTA-156-6pin connectors and 3 standard MTA-156-4
pin connectors.   I figured by using a MOTM-960 Adapter Board we could
get the remaining modules attached to the 950.

There's no doubt that we're pushing the limit... and if we want to add
more modules - well - we'll need more power.

So here's our question:

GIVEN THAT 
- although using the two power supplies may be OK during construction
and initial testing of our synth

AND GIVEN THAT
- we think we ultimately need to add an additional 900 power supply

HOW do you recommend 
- we connect the above modules to the (2) 900s and (1) 950 to minimize
the interference mentioned by Richard Brewster?

Thanks much.

Bill and Will

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