We get a lot of folks from IT in our seminars. Most are horrified at the myriad of connectors found on audio gear. The Euroblock connector is especially confusing, so here are some of the major tenets regarding their use. This allows a large number of connectors to be placed on an equipment chassis. The equipment chassis holds the male Euro. The cable is wired with the female.
Photo 2 — The male Euroblock connector is on the left. The female is on the right. Chassis-mount connectors are male. Cable-mount connectors are female.
An exception is the cable-mount male connector on the left. The two key words regarding the physical size of a Euro are position and pitch. A one position Euro has three electrical contacts, and is suitable for connecting one channel of balanced analog or sometimes digital audio.
This is referred to as pitch. There are several pitches, some of which are nearly identical. This becomes quite apparent for multi-position Euros. Photo 3 — The most popular Euro pitch is 5. There are several other common values, some of which appear identical at first glance inset. In audio a balanced analog input or output always has 3 electrical contacts — plus, minus, and shield.
It is usually consistent within a product line but can vary from brand-to-brand. Examples of all possible orders can be found in the marketplace. The correct order should be silk-screened on the product chassis. Follow it! The world is full of impaired balanced analog interfaces due to incorrectly wired Euroblocks.
Photo 4 — Two popular digital signal processors use opposite pin-outs. Even the channel order varies from product to product. Note that the chassis-mount connectors shown are male. Photo 5 — Euroblock connectors with labeled terminals are now available, as are several colors. Regardless of the labels on the plug, you must wire them according to the silk screening on the equipment chassis Photo 3. Large blocks can be difficult to plug and unplug, even more so when there are large numbers of connectors on a panel.
A pull wire can help reduce flexing of the chassis-mount connector courtesy Symetrix. Wire ferrules will eliminate this problem, and they will also facilitate changes to the pin out if you need to reorder them.
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