Modular Synth Panels

I strongly recommend you get a few of Ken Stone's power supply delay
boards:

http://www.cgs.synth.net/modules/cgs63_psd.html

Although you may have a power supply big enough for the steady state
operation of your modules, it's quite common for those modules to suck
too much power during the initial start up phase which can cause your
power supply to go into a brain dead mode. I was having no end of
problems with this for several years until I got some of Ken's boards.
Since installing these in every cabinet I have not had one problem
with power at startup. And, it's way cool when I turn on the power bar
and hear all these relays click a half second apart. Manly, yes, very
manly.

On 11-Sep-08, at 7:42 PM, James Elliott wrote:

>
> All, I am about to build a new cabinet for my modular, and with that
> I was going to upgrade my powersupply.
> I want a power supply that will take care of ALL of my modules
> (including the newer digital MOTM ones like the 650, 730, etc). I
> was also thinking of including a "break out" distribution system for
> items not necessarily installed in the rack - i.e. desktop modules &
> etc....
>
> I found a power one supply that I think would fulfill my needs and I
> was wondering if I need to do anything special to use it with my
> modular. i.e. Do I need to replace capacitors on the MOTM
> distribution boards?? Do I need to swap the switch & fuse assembly??
> Do I need to use a different type of fuse (if so what value)? Please
> Please Please help me get this set up, I'm tired of using multiple
> power supplies (I've got about 45 modules - about 3/5 are built).
>
> HDCC-150W-AG 150.
> http://tinyurl. com/4q64wp
>
> All help and suggestions would be greatly appreciated.
>

As for CGS63, what is RDEL and RCO from components perspective? Wow can I calculate them and were to get the components afterwards.

RDEL is 1 Megohm. RCO you have to calculate for your relays. I posted
the following message to the MOTM group a long time ago. It lists the
parts you need from Mouser to build the CGS63.

------------------------------------------------

I've recently added Ken Stone's CGS63 power supply delay board to one
of my MOTM synth cabinets. I'm happy to report that it has completely
cured the startup problems I was having with that cabinet. I will be
adding the CGS63 to all remaining cabinets and can highly recommend it
to anyone else who is having power supply startup issues.

Note that the CGS63 will accommodate +/-15V alone, or +/-15V and +5V.
I built the full circuit with support for +/-15V and +5V. Here is a
Mouser parts list for the full circuit:

Quantity Mouser# Desc.
1 512-1N4002 1N4002 diode
1 512-BC338 NPN transistor
1 511-UA741CN 741 op-amp
8 571-6404456 MTA-156 6-pin header
2 653-G6A-274P-DC12 12V relay
1 72-T20YP-500K 500K trimmer
1 291-47K-RC 47 kohm resistor
1 291-10K-RC 10 kohm resistor
1 291-1M-RC 1 Mohm resistor
1 291-100-RC 100 ohm resistor (RCO on CGS63)
1 140-XRL25V1.0-RC 1 uF capacitor

If you don't need +5V at all, and you're sure you never will, then use
this Mouser parts list:

Quantity Mouser# Desc.
1 512-1N4002 1N4002 diode
1 512-BC338 NPN transistor
1 511-UA741CN 741 op-amp
8 571-6404454 MTA-156 4-pin header
1 653-G6A-274P-DC12 12V relay
1 72-T20YP-500K 500K trimmer
1 291-47K-RC 47 kohm resistor
1 291-10K-RC 10 kohm resistor
1 291-1M-RC 1 Mohm resistor
1 291-200-RC 200 ohm resistor (RCO on CGS63)
1 140-XRL25V1.0-RC 1 uF capacitor

It is possible to add the +5V support later, but it would be a pain to
upgrade, so make sure you make the right choice.

For some reason, the 100K trimmer is "obsolete" at Mouser. You can use
any trimmer from 50K to 1M. I've listed the part number for a 500K
trimmer, which is what I used.

On 13-Sep-08, at 3:25 PM, Erez Yaary wrote:

> As for CGS63, what is RDEL and RCO from components perspective? Wow
> can I calculate them and were to get the components afterwards.
> Many thanks.
>