[sdiy] Dotcom synth supply rails harness suggestions needed...

[Jean-Pierre Desrochers]

Thanks for your comments Oscar,

I'm finally in the process of designing
8 PCB's (2 x PCB's in series for each 22 modules row, 4 rows total).
Each PCB size will be around 22" x 2" with 5 traces .140" wide
made of 4onzes copper thickness on each sides.

Each traces are:
+15VDC
Analog GND
-15VDC
Digital GND
+5VDC

Each PCB pair will be linked together with terminal blocks
with short 12AWG wire links.
All the PCB sides close to the main supply lines will connect
to the supply's 5 lines using crimped 10AWG terminals and 10AWG
flexible wires soldered to the supply tabs.
2 of the 22 modules rows are inside a slant cabinet (44 modules total).
I have 2 other smaller cabinets of 22 modules each.
They will connect to the bottom slant cabinet's second supply
using very flexible 16AWG 5 conductors cables for each.

I think the wires & PCB traces gauge sizes all over the supply 
connections
won't drop any significant voltage on the +15/-15vdc lines around 2amps 
max..
I'm hoping so..
JP




Le 2012-09-27 09:14, Oscar Salas a écrit :
> Well, the idea is to have low impedance to avoid ground loops. 
> Resistance
> depends on the length and size of the cables or traces. I think that 
> I
> used 0.75mm2, that was what I had available. However, when more size 
> the
> best.
>
> Also, you could use a strip board and cut it as a bus. If you are
> concerned about the trace's resistance you could solder solid-core 
> wire at
> its length.
>
>
>
>> Nice board !
>> What wire gauge did you use to wire the 'main'
>> 4 pins lower connector to the actual supply VCC lines ?
>>
>> One way I could also do is use your PCB approach
>> but instead of get it made 'square' with 3 connectors rows
>> I could have 2 long PCB's with VERY fat paralell VCC, GND traces,
>> and both PCB's placed in series, aligned in a row screwed on top of 
>> my
>> inside cabinet.
>> close to all the MTA156 connectors.
>> Each PCB would have 11 connectors aligned
>> with modules connectors. Links to each modules could be
>> done with lighter gauge like #22-24.
>> The edge of the closer PCB from the supply
>> would have terminal block that could accept gauge#10 wires
>> for 'no voltage drops' to the main supply VCC connectors.
>> The FAT traces on these PCB's would have the same behaviour as
>> a 'star' mounted wiring to the main supply but with less wires
>> all around the sides.
>> What do you think ?
>> JP
>>
>>
>>  On Mon 24/09/12 14:45 , "Oscar Salas" osalas at electronic-sea.net 
>> sent:
>>> Hello,
>>>
>>> > I was thinking of using a PCB with large traces
>>> close to the supply> voltage outputs
>>> > that would interconnect the main supply voltages
>>> to all> the modules supply cables. But now I wonder if
>>> should use 2 rows of> 22 x MTA156 TYCO part# 640445-6 connectors on
>>> this PCB> and connect them using crimped cables with
>>> MTA156 part# 3-643819-6 on each> of their sides
>>> > or
>>> > if I should solder one side of each cable to
>>> that PCB and their> other sides would be crimped..
>>> > The thing that would help a lot would be
>>> pictures of some> DIY Dotcom system's slant cabinet (rear view) or
>>> any suggestions..> Thanks !
>>> > J-Pierre
>>>
>>> I think that it is more neat and useful the first option.
>>> I did a PCB board distribution for the 4 pin 3.96 pitch connectors.
>>> Maybeyou can do a similar thing for your connectors.
>>> http://electronic-sea.net/power_distribution_board.html
>>>
>>> electronic-sea.net
>>>
>>>
>>>
>>>
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