[sdiy] Power supply for custom Eurorack case

[Matti Palm]

For me it is all about learning. I really like that I understand at least something about how the psu works. It was also my first KiCad-project, wanted to start with something simple. If I was looking for practical synth projects, I should probably just use my laptop. /matti

> 28 jan. 2020 kl. 23:21 skrev Neil Johnson <neil.johnson71 at gmail.com>:
> 
> Why not use a ready-made linear power supply....?
> Genuinely curious.
> 
> Neil
> 
>> On Tue, 28 Jan 2020 at 22:05, 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-board
>>> And also a simple linear PSU with LM317/LM337 that I find low noise: https://github.com/mattip123/PSU-Matti
>>> Maybe 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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