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Oval holes were originally for mixed Analogue Systems (AS) and Doepfer systems. The AS holes are 0.2" from the panel edge and the Doepfer holes are 0.3" (7.62 mm) from the edge. The oval holes were originally used to allow these modules to be placed in the same threaded rows without having the 1/2 HP gap that would otherwise result. These days the oval holes are mostly just centered on the Doepfer spacing.<ref name="oval"/>
For front panels up to 10 HP (2 inches) two mounting holes are sufficient,<!-- http://www.doepfer.de/a100_man/a100m_e.htm --> Widerwider than this and four mounting holes are usual. To attach the modules to the mounting rails M3x6 DIN 7985 cross recessed pan head machine screws are used. The mounting hole diameter is 3.2mm (0.13"), centered 3mm from top and bottom edges and 7.45mm from the left edge. The horizontalright distancehand betweenmounting holes are an increment of 5.08mm, (1 hp) from those on the mountingleft. holesIt hasis normal for left and right holes to be aat multipledifferent ofdistances 5.08mmfrom the panel edges.<ref name="hinton" /><ref name="a100m" /><ref name="confused" /><ref name="stds"/>
The vertical distance between the mounting holes on Eurorack rails is 122.5mm apart (4.823"). Based on the manufacturer's drawings for the most common rails used in Euro cases, the clear space between pairs of rails is:
== Component layout ==
Choose between having jacks easier to read placed near their associated controls, <ref name="measures">Electro-music.com forum:[http://www.electro-music.com/forum/viewtopic.php?t=18281&postorder=asc Standard measurements in front panels] </ref> or below where patch cables are then easier to keep out of the way.
Design the panel so that behind the panel the component bodies have enough clearance from each other and in front both the controls and the users fingers have enough room to operate. Also check that any close to an edge won't interfere with mounting the panel into its enclosure. Check the angle of rotation of the pot will match the scale going to be marked on the panel.<ref name="mikmo">[http://www.mikmo.dk/synthpanels.html How i make front panels.]</ref><!-- here -->
Doepfer and Analogue Solutions both use 20mm (0.8") vertical spacing between pots. <ref>[https://www.muffwiggler.com/forum/viewtopic.php?t=5107 eurorack widths of panels?], Muff Wiggler forum, May 2009</ref>
For spacing between 1/4" jacks, a 30 mm x 17 mm center to center grid is comfortable for most people. Most use wide vertical spacing and narrow horizontal spacing. However the opposite allows for placing legends on the side. When marked above or below these are only visible when no plugs are inserted.<ref>Minimum spacing between 1/4" jacks on DOTCOM modules.. by Andre Majorel on SDIY email list, 18 May 2013</ref>
Behind the panel leave 10 mm clear from top and bottom edges for panel mounted components to clear the rails.<ref name="stds"/>
== Jacks/sockets ==
=== 3.5mm jack sockets ===
3.5mm jack sockets are '''not''' 1/8 inch but are 3.5mm.<ref name="techqs">[http://www.muffwiggler.com/forum/viewtopic.php?t=33821&start=all&postdays=0&postorder=asc Some Eurorack technical questions], Muff Wiggler forum, April 2011</ref> Popular brands of vertical mount 3.5mm mono jacks for Eurorack are Cliff (used by [[Doepfer]]), Erthenvar aka Flight of Harmony, Kobiconn (used by [[Cwejman]], [[Make Noise]], [[Malekko]] and [[Metasonix]]) and Switchcraft. These are available switched (for [[normalisation]]) and unswitched.<ref name="planb">[http://www.muffwiggler.com/forum/viewtopic.php?t=1750&start=all&postorder=asc Plan B/Cliff Jacks], Muff Wiggler forum, September 2008</ref><ref>[http://www.muffwiggler.com/forum/viewtopic.php?t=96727&start=all&postdays=0&postorder=asc Have I bought the wrong jacks for eurorack?], Muff Wiggler forum, November 2013</ref> Erthenvar 3.5mm vertical mount jacks with a thread diameter about 5.9mm (0.232"), will fit well with panel drill holes of 6.0 to 6.5mm diameter.<ref name="erthenvar"/><ref name="msx">[http://www.modularsquare.com/Metasonix-R54-s868.htm Metasonix R54]</ref><ref>[http://www.muffwiggler.com/forum/viewtopic.php?t=73406&start=all&postdays=0&postorder=asc Erthenvar 3.5mm Vertical Mount Jacks], Muff Wiggler forum, December 2012</ref>
Suppliers:
=== Cliff horizontal PCB mount ===
* Mouser:[http://uk.mouser.com/ProductDetail/Kobiconn/16PJ138/?qs=sGAEpiMZZMv0W4pxf2HiV6YU8TCM0qP%252bVS23qqYdSEM%3d Kobiconn 16PJ138], mono 3.5mm, switched
=== Banana sockets ===
Not4 mm banana sockets and jacks aren't normally used on unmodified Eurorack,<ref group="note">[[Befaco]] synth modules have dual footprint for either 3.5 mm jack or banana.<!--http://www.befaco.org/en/sinte-modular/--></ref> banana jack socket are unshielded but CVs don't need shielding and because audio levels are usually high, this won't be a problem. When patching into external synths or other devices use a shielded cable with both ends of the shield connected to ground. Banana sockets are cheaper because they are mechanically simpler. They are also much more durable since there is less to go wrong. They are widely available and come in a range of colours. Banana plugs are stackable i.e. one can plug into the end of another. Most banana synths are designed with stackable plugs in mind, whereas most 1/4" and 3.5mm jack systems include [[multiple]]s.<ref>[http://www.muffwiggler.com/forum/viewtopic.php?t=44407 Banana plugs vs. other plugs], Muff Wiggler forum, Oct 2011</ref><ref>[https://www.muffwiggler.com/forum/viewtopic.php?t=42438
Modifying Euro Modules for Banana Jacks], Muff Wiggler forum, Sep 2011</ref>Regular jacks provide an extra switched connection enabling [[Modular_synthesizer#Normalised_synthesizer|normalization]] (connections when there is no cable plugged in).<ref name="bconv">[https://www.muffwiggler.com/forum/viewtopic.php?t=13985 Doepfer - banana conversion], Muff Wiggler forum, March 2010</ref>
* [http://www.mouser.co.uk/Search/Refine.aspx?Keyword=Banana+Jack Mouser]<!-- be more specific & dimensions -->
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