[sdiy] Power supply for custom Eurorack case

[Didier Leplae]

 Excellent, thanks so much! I should probably get KiCad running anyway so if you haven't already uploaded the BOMs, I can get the info from your KiCad files. 
I'm intrigued by this idea of using laptop power supplies too. You would still need to create the negative voltage and so on, right?
    On Tuesday, January 28, 2020, 05:03:48 PM EST, Matti Palm <matti.palm at gmail.com> wrote:  
 
 Tried to post a too large image last time for the list. Sorry if this is a double post:
I'll upload the BOM. You can also open it in KiCad.A couple of things you may or may not like:- The heatsinks are put on the outside and fastened in the case separately.- The ground plane and power traces are pretty good at sucking out the heat when soldering. Crank up the temp.- Be careful with the mains. I used an aluminum box where I attach the ground wire and a double fused switch, so I don't drop a screwdriver on the high voltage stuff. Also used a lot of heat shrink there.
/matti
On Tue, Jan 28, 2020 at 9:19 PM Didier Leplae <didierleplae at yahoo.com> wrote:

 I'm gonna go ahead and order some of these PCBs that you sent Matti. Thanks!I may or may not use the PSUs but for $2 I can order 5 of them, so why not?Is there a BOM with these? 
    On Tuesday, January 28, 2020, 02:48:03 AM EST, Matti Palm <matti.palm at gmail.com> wrote:  
 
 I made bus boards that I am happy with: https://github.com/mattip123/Eurorack-Bus-boardAnd also a simple linear PSU with LM317/LM337 that I find low noise: https://github.com/mattip123/PSU-MattiMaybe it can be of help if you use KiCad and want a starting point.
/matti
On Tue, Jan 28, 2020 at 8:12 AM Brian Willoughby <brianw at audiobanshee.com> wrote:

If you’re going to the trouble of making custom bus boards, why not just put a few extra parts on there and make a power supply? Grab a book that covers audio power supplies.

Lately, I’ve been favoring external wall warts that output AC instead of the typical DC. I then use the simply two-conductor barrel connector to feed a bog standard linear regulator. If you need multiple voltages, pull them all off the same leg.


I just bought a 7U by 104HP case myself, so I’m just getting started designing my own 1U modules. I’m still new myself, but it seems that 1U is typically 5V-powered, and intellijel seem to have simpler 2-wire 5V supply cables and connectors for the same on their power supplies. Then again, I may be missing something.

Brian


On Jan 27, 2020, at 9:51 PM, Didier Leplae via Synth-diy <synth-diy at synth-diy.org> wrote:
> 
>> How are you handling distribution? 
> 
> I was considering making some custom bus boards as well, just to save $$. 


On Mon, Jan 27, 2020 at 10:28 PM Didier Leplae via Synth-diy <synth-diy at synth-diy.org> wrote:
> I hope this question hasn't been covered ad nauseam in the past but here goes...
> 
> I built a custom case for Eurorack that is 84 hp wide. 
> It has 7 "normal" rows plus a 1u row. (I guess that makes a total of 672 hp)
> 
> I have roughly figured I will need a power supply with @ 3A for +12V and 2A for -12V. (The 5V seems to be hardly used and yet the power supplies I've looked at have an overabundance, probably 1A would be plenty )


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