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==== Panels ====
Doepfer specifies the Eurorack front panel material as 2 mm anodized aluminium.<ref name="a100m">Doepfer [http://www.doepfer.de/a100_man/a100m_e.htm A-100 Construction Details]</ref> In practice panels from other manufacturers may slightly differ, e.g. Synthwerks use the closest gauge that [http://metalphoto.com/ Metalphoto] offer which is 0.0625" (1.59 mm). Also check data sheets for front panel parts, e.g. the maximum recommended thickness for [[3.5 mm Cliff 1384 jack]]s is 2.5 mm.<ref name="guage">[http://www.muffwiggler.com/forum/viewtopic.php?t=51475&start=all&postdays=0&postorder=asc Aluminum Panel Guage???], Muff Wiggler forum, January 2012</ref>
Front panel dimensions in the the Eurorack format are specified in U and HP not in inches or millimeters. One U (unit) or in German HE (höhen einheit) is {{frac|1
The vertical space available between mounting rails is:
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Those don't include the tolerances (slop) of the nut in the rail moving up and down and the screw hole in the front panel. These can cause the rails to be closer or further apart when any given module is tightened in. It's better to try to give a little more clearance and not count on these exact figures.<ref name="six" />
To fit between the mounting rails the maximum vertical PCB size can be from 108 mm ({{frac|4
=== Stacked PCBs ===
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==== Doepfer ====
For the leads between PSU and bus boards,
Ribbon cables, (the de facto standard)<ref name="hinton" /> use two row of 8 pin header for connecting power and [[normalising]] [[CV/gate]]. The pins are 0.1" (2.54mm) apart and at a 0.1" pitch. The interconnection is done via ribbon cable with 1.27mm (0.05") pitch, and using female sockets, 16-pin to the supply bus and either 16 or 10-pin to the module. The colored wire on the ribbon cable indicates -12V.<ref>Doepfer [http://www.doepfer.de/a100_man/a100t_e.htm Technical Details A-100]</ref><ref name="ta">[http://analogue-heaven.1065350.n5.nabble.com/some-help-building-a-rack-for-doepfer-tp25377p25380.html Re: some help building a rack for doepfer] by [[Tony Allgood]], Analogue Heaven email list, 29 June 2006</ref><ref name="def" /><ref name="dcon">[http://www.muffwiggler.com/forum/viewtopic.php?t=37111&start=all&postdays=0&postorder=asc Doepfer connectors?], Muff Wiggler forum, June 2011</ref> Pins are numbered from pin 1 with even numbers along one side and the odd numbered ones along the other.<ref>[http://connector.pinoutsguide.com/16_pin_IDC_male/ 16 pin IDC male connector diagram and applications pinouts]</ref>
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