<div dir="ltr"><div>Neil, I think it's a shipping cost thing, because of the heavy transformers. <br></div><div>Speaking from personal experience, by the time I calculate the exchange from CAD to USD, on top of the shipping, I'm usually pretty discouraged. <br></div><div>The other problem I find with the ready-made linear supplies is they tend to come in really awkward packaging. By the time I go through the hassle of installing it in a rack enclosure, I should have just built something from locally salvaged transformers.</div><div>This is my current solution, along with the 317/337 kits from ebay. <br></div><div>Cheers,</div><div>Colin<br></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Tue, Jan 28, 2020 at 5:23 PM Neil Johnson <<a href="mailto:neil.johnson71@gmail.com">neil.johnson71@gmail.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">Why not use a ready-made linear power supply....?<br>
Genuinely curious.<br>
<br>
Neil<br>
<br>
On Tue, 28 Jan 2020 at 22:05, Matti Palm <<a href="mailto:matti.palm@gmail.com" target="_blank">matti.palm@gmail.com</a>> wrote:<br>
><br>
> Tried to post a too large image last time for the list. Sorry if this is a double post:<br>
><br>
> I'll upload the BOM. You can also open it in KiCad.<br>
> A couple of things you may or may not like:<br>
> - The heatsinks are put on the outside and fastened in the case separately.<br>
> - The ground plane and power traces are pretty good at sucking out the heat when soldering. Crank up the temp.<br>
> - 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.<br>
><br>
> /matti<br>
><br>
> On Tue, Jan 28, 2020 at 9:19 PM Didier Leplae <<a href="mailto:didierleplae@yahoo.com" target="_blank">didierleplae@yahoo.com</a>> wrote:<br>
>><br>
>> I'm gonna go ahead and order some of these PCBs that you sent Matti. Thanks!<br>
>> I may or may not use the PSUs but for $2 I can order 5 of them, so why not?<br>
>> Is there a BOM with these?<br>
>><br>
>> On Tuesday, January 28, 2020, 02:48:03 AM EST, Matti Palm <<a href="mailto:matti.palm@gmail.com" target="_blank">matti.palm@gmail.com</a>> wrote:<br>
>><br>
>><br>
>> I made bus boards that I am happy with: <a href="https://github.com/mattip123/Eurorack-Bus-board" rel="noreferrer" target="_blank">https://github.com/mattip123/Eurorack-Bus-board</a><br>
>> And also a simple linear PSU with LM317/LM337 that I find low noise: <a href="https://github.com/mattip123/PSU-Matti" rel="noreferrer" target="_blank">https://github.com/mattip123/PSU-Matti</a><br>
>> Maybe it can be of help if you use KiCad and want a starting point.<br>
>><br>
>> /matti<br>
>><br>
>> On Tue, Jan 28, 2020 at 8:12 AM Brian Willoughby <<a href="mailto:brianw@audiobanshee.com" target="_blank">brianw@audiobanshee.com</a>> wrote:<br>
>><br>
>> 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.<br>
>><br>
>> 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.<br>
>><br>
>><br>
>> 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.<br>
>><br>
>> Brian<br>
>><br>
>><br>
>> On Jan 27, 2020, at 9:51 PM, Didier Leplae via Synth-diy <<a href="mailto:synth-diy@synth-diy.org" target="_blank">synth-diy@synth-diy.org</a>> wrote:<br>
>> ><br>
>> >> How are you handling distribution?<br>
>> ><br>
>> > I was considering making some custom bus boards as well, just to save $$.<br>
>><br>
>><br>
>> On Mon, Jan 27, 2020 at 10:28 PM Didier Leplae via Synth-diy <<a href="mailto:synth-diy@synth-diy.org" target="_blank">synth-diy@synth-diy.org</a>> wrote:<br>
>> > I hope this question hasn't been covered ad nauseam in the past but here goes...<br>
>> ><br>
>> > I built a custom case for Eurorack that is 84 hp wide.<br>
>> > It has 7 "normal" rows plus a 1u row. (I guess that makes a total of 672 hp)<br>
>> ><br>
>> > 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 )<br>
>><br>
>><br>
>><br>
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</blockquote></div><br clear="all"><br>-- <br><div dir="ltr" class="gmail_signature"><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div><a href="https://www.instagram.com/colinmuirdorward/" target="_blank">https://www.instagram.com/colinmuirdorward/</a></div><div><a href="https://www.instagram.com/colinmuirdorward/" target="_blank">-<br></a></div><div><a href="https://www.instagram.com/ssdp_synthesis/" target="_blank">https://www.instagram.com/ssdp_synthesis/</a></div></div></div></div></div></div></div>