40
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17. From Dave’s
Lab
Circuit Protection
Eurorack suffers from the problem of power
connector reversal. When 10 pin connectors
are used, mis-insertion results in a swap
of +12V and -12 V, and protection is easily
accomplished using various techniques such
as series diodes.
But more systems are providing the +5V
supply and thus use the full 16 pin connector.
When this is reversed, a diode-protected
module is still safe, but the six connected
ground pins in the module will short
together the system’s +5V and +12V supplies,
potentially damaging the power supply and
any modules that use +5V.
To prevent this, Rossum Electro-Music
modules deviate from the standard Eurorack
power connector by leaving power
connector pins 9 and 10 open, rather than
connecting them to ground. When plugged
in backwards, this leaves the 12V
supply disconnected. Since ground is still
supplied by four pins as well the chassis and
any patch cords connected to the module,
the dropping of these two pins has no
measurable effect on circuit performance,
but it means that if a Rossum Electro module
is accidentally plugged in backwards,
no stress is placed on the +5V supply or
modules
Summary of Contents for MOB OF EMUS
Page 5: ...5 3 Overview...
Page 42: ...42...
