But now that I think about it, wouldn't it be nice to build your own rack of lab instruments, or is this already done? So far I've seen only synthesizer modules for this Eurorack type system. And in the audio world this format is often used, so you can add and mix modules from different vendors without problems. All share the same power supply on the back (+/-12V and 5V) and are available in standardized widths, with 1 HP the width granularity (5.08 mm = 1/5") and 128.5 mm height (5"). I bought a few blank front plates as well for DIY modules, they cost only a few Euros, depending on the width (you can see a few mounted, in the video).
Even if it doesn't make sense commercially, I just started with it. Now I have already another +12/-12/+5V fixed voltage power supply
![Smiley :)](https://www.eevblog.com/forum/Smileys/default/smiley.gif)
![](http://i.imgur.com/8arGPXU.jpg)
In its natural habitat:
![](http://i.imgur.com/GRJ0UXq.jpg)
Don't know where I bought the banana jacks, was in my parts bin, but the blank panel was
this. So you can basically build a half decent looking DIY Eurorack module for EUR 3, if you have all the other parts for it. I've seen even panels made with PCB boards, which is a nice idea, because they are so cheap these days, you can add some nice looking silkscreen, and you don't have to do the drills yourself.