MOTM

Here is the problem: I have seen the future and it involves LOTS of
modular synth bits.  And regardless of who I read aboot, they say they
have run out of space for their rig.  Also, the future includes +5V. 
Really it does.

So here is the plan:  start nice and easy and get something up and
running at a reasonable cost, hopefully using parts that can be
cannibalised into larger designs in the future or sold off without
loosing all of their value.

So here is the question:  currently I own or have on order only
modules that require +/- 15V.  But I can tell that I will eventually
need +5V.  Is the following solution feasible?  Purchase a 5A Power
One +/- 15V linear supply now and add a small +5V supply at a later
date.  Assuming that I connect the secondary grounds, will this be
electrically adequate to power the inevitable MOTM MIDI-CV module
purchase?

PLL, BFG

The Power One's with added +5V are cheaper than buying 2. Look at the CP-131 
model, for example.

But, you can always add a +5V, 6A supply later. Just tied the grounds together 
*at one point only*. A terminal block is good for this.

Paul S.

----- Original Message ----- 

From: "Greg Amann" <greg.amann@...>
To: <motm@yahoogroups.com>
Sent: Sunday, May 15, 2005 6:49 AM
Subject: [motm] I have seen the future ...


> Here is the problem: I have seen the future and it involves LOTS of
> modular synth bits.  And regardless of who I read aboot, they say they
> have run out of space for their rig.  Also, the future includes +5V.
> Really it does.
>
> So here is the plan:  start nice and easy and get something up and
> running at a reasonable cost, hopefully using parts that can be
> cannibalised into larger designs in the future or sold off without
> loosing all of their value.
>
> So here is the question:  currently I own or have on order only
> modules that require +/- 15V.  But I can tell that I will eventually
> need +5V.  Is the following solution feasible?  Purchase a 5A Power
> One +/- 15V linear supply now and add a small +5V supply at a later
> date.  Assuming that I connect the secondary grounds, will this be
> electrically adequate to power the inevitable MOTM MIDI-CV module
> purchase?
>
> PLL, BFG
>
>
>
>
>
>
>
> Yahoo! Groups Links
>
>
>
>
>
>

How difficult is it to switch an MOTM 900 over for 12v use? What would 
this entail?
I'm running my MOTM stuff alongside my Modcan stuff on a giant 3A 
Cyndustries supply now and want to use the 900 to add a few Doepfer 
modules. Their cases/supplies are too expen$ive for me so I wanted to 
build a case and put the 900 back in service.
Also, is there a master list of MOTM current draw per module anywhere I 
could peruse?
Thanks.
---Ben

On May 15, 2005, at 10:10 AM, Paul Schreiber wrote:

> The Power One's with added +5V are cheaper than buying 2. Look at the 
> CP-131
>  model, for example.
>
>  But, you can always add a +5V, 6A supply later. Just tied the grounds 
> together
>  *at one point only*. A terminal block is good for this.
>
>  Paul S.
>

----- Original Message -----

From: ben vehorn

To: Sent: Sunday, May 15, 2005 4:17 PM

Subject: [motm] While we're talking about power supplies...

How difficult is it to switch an MOTM 900 over for 12v use? What would this entail?
I'm running my MOTM stuff alongside my Modcan stuff on a giant 3A Cyndustries supply now and want to use the 900 to add a few Doepfer modules. Their cases/supplies are too expen$ive for me so I wanted to build a case and put the 900 back in service.
Also, is there a master list of MOTM current draw per module anywhere I could peruse?
Thanks.
---Ben

>So here is the question:  currently I own or have on order only
>modules that require +/- 15V.  But I can tell that I will eventually
>need +5V.  Is the following solution feasible?  Purchase a 5A Power
>One +/- 15V linear supply now and add a small +5V supply at a later
>date.  Assuming that I connect the secondary grounds, will this be
>electrically adequate to power the inevitable MOTM MIDI-CV module
>purchase?

Yes, I have done this. I have standard issue MOTM-900 power supplies 
in each of my cabinets. In one cabinet I added an additional +5V 
Power One supply along with the MOTM-990 power distribution board. 
The MOTM-900 supplies +/- 15V and analog GND to the 990, and the 
other supplies the +5V and digital GND to the 990. I have been 
meaning to document this on my website but haven't had time. All I've 
got is this one picture showing how it all hooks up:

http://www.tellun.com/two4one.jpg

The distribution board on the MOTM-900 has been replaced by a piece 
of plexiglass that holds a terminal strip and two additional fuses. 
You have to fuse each power supply separately, plus there's a 
redundant third fuse in the power on/off switch. Also, you have to 
connect the two grounds of the power supplies together to maintain a 
"star" ground.

...and it has now gone from one to two children.  Emily Claire Rider
decided to arrive a week early, born May 12th at 8:30AM.

  I might get to solder stuff again in...what...2009?

Crow
/**/

Congratulations - when you are old I doubt you will look back and say, 
"Dangnabit!  If I hadn't been bothered by my family so much, I would 
have had more time to solder!"  :)

Larry (father of 6)

On May 16, 2005, at 3:52 AM, The Old Crow wrote:

>
>   ...and it has now gone from one to two children.  Emily Claire Rider
> decided to arrive a week early, born May 12th at 8:30AM.
>
>   I might get to solder stuff again in...what...2009?
>
> Crow
> /**/
>
>
>
>
>
> Yahoo! Groups Links
>
>
>
>
>
>

Hi Gert/list,
I'm about to do this right now. 
I found the VW1 and VW2 pairs of stubs.
I can just re-connect each one with jumper wire, correct?
I don't need a resistor or anything?
Thanks.
---Ben

--- In motm@yahoogroups.com, "Gert Jalass" <synth@g...> wrote:
> Hi Ben,
> 
> this can be done pretty straightforward - on the PCB (of the Power One) you can spot 
(the remains of) two jumpers (VW1 and VW2). "Re-install" them and the supply will provide 
+- 12V. You may need to adjust the two trimmers (labelled "-V ADJ" and "+V ADJ") to trim 
to the expected output voltage.

> 
> Gert 
>   ----- Original Message ----- 
>   From: ben vehorn 
>   To: Sent: Sunday, May 15, 2005 4:17 PM
>   Subject: [motm] While we're talking about power supplies...
> 
> 
>   How difficult is it to switch an MOTM 900 over for 12v use?

Nevermind, I got it.
Thanks.

On May 23, 2005, at 6:52 PM, benvehorn wrote:

> Hi Gert/list,
>  I'm about to do this right now.
>  I found the VW1 and VW2 pairs of stubs.
>  I can just re-connect each one with jumper wire, correct?
>  I don't need a resistor or anything?
>  Thanks.
>  ---Ben