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# Eurorack
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## Basics
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The eurorack standard is one among many modular synthesis standards. This typically contains things like module size (eurorack uses 3U or 133,35mm module height) and the [powersupply](powersupply) voltage (eurorack uses ±12V and sometimes a additional 5V). The width of modules is meassured in HP ("Horizontal Pitch" or TE "Teilungseinheit" in German). One HP equals 1/5 inch or 5,08 mm.
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The eurorack standard is one among many modular synthesis standards. This typically contains things like module size (eurorack uses 3U or 133,35mm module height) and the [powersupply](powersupply) voltage (eurorack uses ±12V and sometimes a additional 5V). The width of modules is meassured in HP ("Horizontal Pitch" or TE "Teilungseinheit" in German). One HP equals 1/5 inch or 5,08 mm. For further Details on these Standards have a look on [Doepfer's Instructions Page](http://www.doepfer.de/a100_man/a100m_e.htm).
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![Typical Eurorack](http://modular.atoav.com/x/eurorack.jpg)
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A eurorack synthesizer consists of one or more modules, which are patched together via mono 3.5mm patchcabels (this is the mono version of what the typical headphone plug looks like). The signals deviate between ±10 volts but can be even bigger in some cases. This is why it is not adviced to plug a eurorack signal directly into other audio hardware unless it is e.g. a mixer with enough headroom or a soundinterface which can lower the levels with a input pad.
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