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.
that no multiple ground circuits are formed
when
the
microphones
are mounted
on
tripods etc.
Connection
to Amplifiers with High Input
Sensitivity
If the amplifier being used has a very high
input sensitivity, i. e. when it is normally in-
tended
for use with dynamic microphones,
it can be necessary
to reduce the output
voltage from the microphone
by
means of
a voltage divider. This should be built into
the microphone cable at the amplifier input.
By this means the large signal on the micro..
phone cable is maintained up to just before
I"e
amplifie!', whi~h helps to increase
the
~~nal
to nOlse ratio.
Connection to Amplifiers with Defined Input
Impedances
Sennheiser
studio condenser
microphones
can be connected
direct to all amplifiers
whose input impedance
is larger than 200 Q,
This is usual in the majority of cases. How-
ever,
if the input impedance
is smaller
than 200 Q, a resistor of appropriate
value
should be placed in series with the micro..
phone so that it "sees"
at least 200 Q. Tho
voltage division caused
by this se des re-
sistor must of course
be considered.
The same
method
can be used when a
higher output impedance
of the microphono
is demanded.
In this case
again asories
resistor
can be used to provide
correct
matching.
Connection to Amplifiers with Powering
Facilities
If an appropriate
voltage source is available
in the amplifier the condenser
microphone
can be powered direct. The voltage should
be 12 volts :t 2 volt. It should be so stabi-
lised and filtered, that the unweighted noise
voltage
is less than 5 flV and that the
weighted
noise components
are less than
2 ~lVolts. The current
consumption
of the
microphone
is approximately
5 to 6 mA.
According
to the DIN standard
the feed
resistors should be 2 x 180 Q :t 1 %. This
means that approx. 2 volts are lost across
the resistors.
The circuit of the MKH 415 is so dimen-
sioned that a supply voltage tolerance
of
12 volts :t 2 volts is permitted.
11
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