Modular Synth Panels

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.

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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.
>