MOTM

Anyone else have an issue with the default length of the power 
cables?  

I currently have 2 19" rows of modules and the bottom of the case is 
about 2.5" lower than the lower rack rail to leave room for the power 
supply.  A cable from the top left or right going to the distribution 
board doesn't reach, so my distribution board sort of dangles in the 
air about 0.5" from the bottom.  (not safe)  I suppose if my make-
shift cabinet had a back, I could mount the distribution board in the 
middle of the 2 rows.

For my new cabinet, it looks like I'll need to make some new cables.

thanks,
Larry

If you want to make cables longer than 30 inches, you need to use 12ga wire, 
14ga at the very least.

Paul S.

Hi,

On 20.09.2006 21:15 Uhr, Paul Schreiber wrote:
> If you want to make cables longer than 30 inches, you need to use 12ga wire, 
> 14ga at the very least.
>
>   
what's that in european measures?
I'm about to connect two 19" boxes (2x10U each) externally driven by a 
single PSU.


  Thanks, Michael.

> 
> Anyone else have an issue with the default length of the power=20
> cables?=20=20
> 
> I currently have 2 19" rows of modules and the bottom of the case is=20
> about 2.5" lower than the lower rack rail to leave room for the power=20
> supply.  A cable from the top left or right going to the distribution=20
> board doesn't reach, so my distribution board sort of dangles in the=20
> air about 0.5" from the bottom.  (not safe)  I suppose if my make-
> shift cabinet had a back, I could mount the distribution board in the=20
> middle of the 2 rows.
 
I'm dealing with the same issue.  I have 2 rack cases of 3 rows of
modules in the works.  To save space in the front I want to mount the
PS in the back, but even though the rack isn't very deep very few modules
in the front will be close enough to the PS to be able to connect using 
the default wiring.

How is everyone else doing it on those big Synths Of Doom I keep seeing
in pictures?  Are you wiring your own extra-long cables?  Are you daisy
chaining extension connector blocks?

----------------------- Tear Along Dotted Line -----------------------
John Neilson                                           jneil@...

    this message brought to you by 'e-mail' -- safe, clean, Modern!

On 20 Sep 2006, at 23:01, Michael Zacherl (aka TonTaub) wrote:

> On 20.09.2006 21:15 Uhr, Paul Schreiber wrote:
>> If you want to make cables longer than 30 inches, you need to use  
>> 12ga wire,
>> 14ga at the very least.
>>
> what's that in european measures?

Here's a nice page describing awg<>metric conversions:
http://www.vandenhul.nl/artpap/awg.htm

Ben

I have four cabinets, each with their own power supply.  I daisy 
chain the AC power from a single front panel switch.

I mounted the power supply in the center of the cabinet on 1" risers 
as far to the back as possible.  I put a distribution board on 
either side of the cabinet so I can use the shorter cables to reach 
any position within the cabinet.  I have to use my shorter modules 
in the center to allow room for the power supply.  That isn't an 
issue with the MOTM modules but is with Blacet which tend to be 
deeper.  The two power distribution boards per cabinet did add extra 
dollars to my setup but I wanted to keep the power cables short and 
fairly clean.

You can see a composite photo of my cabinet and power supply in the 
middle of this page
http://www.modularsynthesis.com/cabinet/cabinet.htm

The front mounted module is a AC power switch, cable tester, and 
headphone amp.  The rear mounted module is my AC mains with AC in 
and switched AC out.  Each of the slave modules just daisy chain 
these connectors.  I also mounted an external AC fuse as well as a 
DC power connector and DC fuses.  That allows me to bring DC out of 
the cabinet which I typically do for debug and calibration.

Dave


--- In motm@yahoogroups.com, jneilyahoo@... wrote:

> How is everyone else doing it on those big Synths Of Doom I keep
> seeing in pictures?  Are you wiring your own extra-long cables?
> Are you daisy chaining extension connector blocks?

I forgot to add ...
I later added a delay module so that one distribution board powers up 
immediately and the second distribution board powers up about 250 mS 
later.  That really helped with eliminating power supply crowbar with 
my quantity of modules. I used a 555 timer and some quality relays.  
Today I'd probably do it with an Atmel AVR processor.

http://www.modularsynthesis.com/modules/DJB-Power/djbpower.htm

Dave

--- In motm@yahoogroups.com, "djbrow54" <davebr@...> wrote:

> I mounted the power supply in the center of the cabinet on 1" risers 
> as far to the back as possible.  I put a distribution board on 
> either side of the cabinet so I can use the shorter cables to reach 
> any position within the cabinet.

Each of my cabinets has one or two power supplies of its own.  Each 
cabinet has the MOTM-900 or 950 panel mounted on the back with the power 
switch, which is normally left in the on position.  I run the AC power 
input of all to a common switched, surge-protected power bar and use 
that to turn everything on and off.

The top cabinet has a MOTM-900 and a MOTM-950, each with their own 
distribution boards, which I mount on the cabinet instead of on the supply.

My middle cabinet has one* Power-One* HBB15-1.5-A supply.  It connects 
to a MOTM-960 21-connector distribution board in the center of the 
cabinet.  Only the modules on the ends need a 30-inch MOTM supply connector.

My large dot com cabinet has one 3A supply, Power One HCC15-3-A.  I use 
one MOTM-960 21-connector expansion board, plus one of the 12-connector 
boards from a MOTM-900 supply.  The 960 is wired to the supply, and the 
daisy-chain connector on the other end is wired to the 12-connector 
board Sta-Cons.  I used #14 stranded copper wire.  Between the power 
supply and the 900 and then to the 12-connector board is about 15 inches 
each of that wire.  Most of the modules connect with the standard 
20-inch MOTM power connector.  I use a few of the 30-inch ones.

My cabinet page has some pictures.  The three at the bottom are current.

http://www.pugix.com/cabinet_new.htm

Richard Brewster
http://www.pugix.com

jneilyahoo@... wrote:

> How is everyone else doing it on those big Synths Of Doom I keep seeing
> in pictures?  Are you wiring your own extra-long cables?  Are you daisy
> chaining extension connector blocks?
>
>

Yeah, sorry, I realized that I should probably have said "Synth Of Doom <tm>
And Other Modulars Large Enough To Bend Light Into Their Gravitational Fields"
... don't want to infringe on anyone's trademark.

Seriously, this has all been very helpful.  Thanks for the tips and pics!

> 
> The Synth of Doom does it like this:
> 
> http://www.hotrodmotm.com/distribute_sod.htm
> 
> Moe
> 
>
> jneilyahoo@... wrote:
> > How is everyone else doing it on those big Synths Of Doom I keep seeing
> > in pictures?  Are you wiring your own extra-long cables?  Are you daisy
> > chaining extension connector blocks?
> >

----------------------- Tear Along Dotted Line -----------------------
John Neilson                                           jneil@...

    this message brought to you by 'e-mail' -- safe, clean, Modern!

Hello Everyone,

I'm putting my '700 together, and I'm at the very last step, but  
something seems fishy. The instructions say to solder the white wire  
for the CV In jack to the left lug of the jack, which seems right to  
me. But then it says to solder the orange wire to the top  
(Normalling) lug of the jack. The normalling lug is also supposed to  
be connected to the beveled jack with a scrap resistor lead. My  
question is, when one plugs a cable into this jack, won't it  
disconnect ground from beveled jack? That seems wrong, doesn't it? Is  
it? Why wouldn't you connect the orange wire to the beveled lug of  
the jack? Is the beveled lug of the jack assumed to be grounded via  
the front panel?

-Chris

Since the top (normal) and bevel (ground) are connected together with 
the scrap lead, it doesn't matter which one the orange wire connects 
to.  With nothing plugged in, the normal switch connects the top to the 
left lug, grounding it through the scrap lead.  When a jack is plugged 
in, the normal connection opens and the signal goes to the white wire on 
the left lug.  The orange wire is always grounded.

Richard Brewster
http://www.pugix.com

xamboldt wrote:

> Hello Everyone,
>
> I'm putting my '700 together, and I'm at the very last step, but  
> something seems fishy. The instructions say to solder the white wire  
> for the CV In jack to the left lug of the jack, which seems right to  
> me. But then it says to solder the orange wire to the top  
> (Normalling) lug of the jack. The normalling lug is also supposed to  
> be connected to the beveled jack with a scrap resistor lead. My  
> question is, when one plugs a cable into this jack, won't it  
> disconnect ground from beveled jack? That seems wrong, doesn't it? Is  
> it? Why wouldn't you connect the orange wire to the beveled lug of  
> the jack? Is the beveled lug of the jack assumed to be grounded via  
> the front panel?
>
> -Chris
>

But if you plug in a cable, isn't the sleeve no longer connected to  
ground at the 700 (the ground/bevel lug is floating)? In effect  
making it an unshielded (at least on the 700 side) connection?

-Chris

On Sep 21, 2006, at 9:43 PM, Richard Brewster wrote:

> Since the top (normal) and bevel (ground) are connected together with
> the scrap lead, it doesn't matter which one the orange wire connects
> to. With nothing plugged in, the normal switch connects the top to the
> left lug, grounding it through the scrap lead. When a jack is plugged
> in, the normal connection opens and the signal goes to the white  
> wire on
> the left lug. The orange wire is always grounded.
>
> Richard Brewster
> http://www.pugix.com
>
> xamboldt wrote:
> > Hello Everyone,
> >
> > I'm putting my '700 together, and I'm at the very last step, but
> > something seems fishy. The instructions say to solder the white wire
> > for the CV In jack to the left lug of the jack, which seems right to
> > me. But then it says to solder the orange wire to the top
> > (Normalling) lug of the jack. The normalling lug is also supposed to
> > be connected to the beveled jack with a scrap resistor lead. My
> > question is, when one plugs a cable into this jack, won't it
> > disconnect ground from beveled jack? That seems wrong, doesn't  
> it? Is
> > it? Why wouldn't you connect the orange wire to the beveled lug of
> > the jack? Is the beveled lug of the jack assumed to be grounded via
> > the front panel?
> >
> > -Chris
> >
>
>
>

Nevermind - of course it's still grounded. I typed before thinking  
yet again... :)

-Chris

On Sep 21, 2006, at 10:27 PM, xamboldt wrote:

> But if you plug in a cable, isn't the sleeve no longer connected to
> ground at the 700 (the ground/bevel lug is floating)? In effect
> making it an unshielded (at least on the 700 side) connection?
>
> -Chris
>
> On Sep 21, 2006, at 9:43 PM, Richard Brewster wrote:
>
> > Since the top (normal) and bevel (ground) are connected together  
> with
> > the scrap lead, it doesn't matter which one the orange wire connects
> > to. With nothing plugged in, the normal switch connects the top  
> to the
> > left lug, grounding it through the scrap lead. When a jack is  
> plugged
> > in, the normal connection opens and the signal goes to the white
> > wire on
> > the left lug. The orange wire is always grounded.
> >
> > Richard Brewster
> > http://www.pugix.com
> >
> > xamboldt wrote:
> > > Hello Everyone,
> > >
> > > I'm putting my '700 together, and I'm at the very last step, but
> > > something seems fishy. The instructions say to solder the white  
> wire
> > > for the CV In jack to the left lug of the jack, which seems  
> right to
> > > me. But then it says to solder the orange wire to the top
> > > (Normalling) lug of the jack. The normalling lug is also  
> supposed to
> > > be connected to the beveled jack with a scrap resistor lead. My
> > > question is, when one plugs a cable into this jack, won't it
> > > disconnect ground from beveled jack? That seems wrong, doesn't
> > it? Is
> > > it? Why wouldn't you connect the orange wire to the beveled lug of
> > > the jack? Is the beveled lug of the jack assumed to be grounded  
> via
> > > the front panel?
> > >
> > > -Chris
> > >
> >
> >
> >
>
>
>