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Message

Re: Help with power supply upgrade.

2007-04-12 by djbrow54

I should add that even with my supplies lightly loaded I had trouble 
with them powering up correctly.  I ended up designing my own PS 
sequencing circuit before Ken did his to solve the problem.  I keep an 
excel spreadsheet of my current.  I have measured all of my modules so 
these are representative currents.  The first 4 are all 800 mA power 
supplies and the last is a 400 mA supply.  I was seeing power-on 
problems on the 461/448 and 324/231 loads.  I do have before and after 
photos of the supplies with my delay if people are interested.  It 
made a big difference in shortening the power up from 40 mS to around 
5 mS.

For external loads, such as my keyboard, I use the Tyco CPC Circular 
Plastic Connectors which seem to work very reliably.  I don't remember 
the current rating but I doubt that they would be suitable for an 
entire cabinet.

+15   -15
---   ---
568	379
461	448
324	231
334	114
265	251

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

--- In motm@yahoogroups.com, ac <analoghell@...> wrote:
> FWIW I found that using CGS PSU delay boards to stop all the modules
> powering up at once in each cabinet makes the 900's way more stable.
> They can tolerate many more modules.

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