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

[Jean-Pierre Desrochers]

I forgot to mention that each PCB
will have 11 x MTA-156 6 pins male connectors equally spaced.
The analog GND uses 2 pins on the MTA connectors
so there will be 6 copper traces overall but
5 connections to each of the 2 supplies.
JP


Le 2012-09-27 10:52, Jean-Pierre Desrochers a écrit :
> 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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>>>
>>
>>
>> electronic-sea.net
>
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