Lehle Stereo Volume, Руководство пользователя

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The Lehle Stereo Volume is a volume pedal
equipped with a precise magnetic sensor enabling
it to operate almost wear-free. This sensor uses the
Hall effect, named after Edwin Hall, to measure
the strength of magnetic fields. In the
Lehle
Stereo Volume the Hall sensor, which is made
in Germany, is accurately calibrated to the built-in
magnet and the control range of the pedal. The
pedal moves only the magnet, while the distance is
measured by the Hall sensor which controls a VCA.
A premium Blackmer
® Stereo VCA (= Voltage Con-
trolled Amplifier) from the United States replaces
here the mechanical potentiometer. The principle
of the voltage-controlled amplifier is based on the
fact that gain can be varied by the control voltage
coming from the Hall sensor. This technique allows
to operate more precisely than conventional
mechanical potentiometers or optical sensors used
by the standard volume pedals. In addition the
potentiometer-typical noise and the complicated
adjustment are eliminated.
Over the entire control range the
Lehle Stereo
Volume transmits the full sound spectrum of the
connected instrument. The input and output im-
pedance always stay the same, ensuring that there
will be no damping of higher frequencies as with
potentiometers.
Internally, the input voltage coming from the power
supply socket of the pedal is rectified, then filtered,
stabilized and doubled to 18 V, thus achieving a
total dynamic range of 110 dB with a high level
stability. The two outputs can tapped unbalanced
by TS plugs or balanced by TRS plugs.The volume
control of the
Lehle Stereo Volume ranges from
-92 dB to 0 dB - so from a virtually muted level to
the same volume.
The
Lehle Stereo Volume runs mechanically
extremely smooth and steady, as it is equipped
with low-friction bearings of a high-performance
polymer, and there is no mechanical transmission
of the pedal to other components. By means of an
adjusting screw the mobility of the pedal can be
modified very precisely.
Technical data
Weight: 1,680 g
Length: 26 cm (10.24‘‘)
Width: 10 cm (3.94‘‘)
Overall height: 6.6 cm (2.6‘‘)
Voltage: 9 - 15 V DC or 7 - 12 V AC
Power consumption: 62 mA
Frequency range: 20 Hz - 100 kHz (+/- 0,2 dB)
THD: < 0,05 % at 1 kHz, -10 dBu
Input: TS jack unbalanced, 2 MOhm
Output: TRS jack balanced, 500 Ohm
Signal-to-noise ratio: -100 dB at 1 kHz, 0 dBu A weighted
Max level: 3 V RMS (approx. 12 dBu at 12 V input voltage)