Lehle Mono Volume User Manual

Lehle Mono Volume

User Manual

www.lehle.com

Lehle GmbH • Grenzstr. 153 • D-46562 Voerde • Germany • Tel [phone]

Dear Musician!

Thank you for purchasing your Lehle Mono Volume!
I have been building units that switch, split and route signals with no technical
compromises and with maximum musical fidelity since 1999. Your new Lehle

Mono Volume comprises only the very best components. Every module of your
Lehle Mono Volume has been made and tested in Germany.

To make sure that you can enjoy your Lehle Mono Volume for a long time, it
is of extremely robust design and construction. If you should nonetheless have a
problem, or simply a question, just mail me or a member of the Lehle team at:
[e-mail]

I wish you much pleasure and success with your Lehle Mono Volume!

Burkhard Georg Lehle

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Contents

Introduction .................................................................................................................................2

Technical data ........................................................................................................................... 3

General description ..................................................................................................................4

Typical uses

- Lehle Mono Volume as a classic volume pedal ............................................................... 9

- Lehle Mono Volume with two amps ........................................................................... 10

- Lehle Mono Volume to blend effects ............................................................................11

Lehle Mono Volume signal flow diagram ............................................................................... 14

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The Lehle Mono 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
Mono 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 VCA (= Voltage Controlled
Amplifier) from the United States replaces in this
case 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 Mono
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.
The volume control of the Lehle Mono Volume
ranges from -92 dB to 0 dB - so from a virtually
muted level to the same volume. With a potentio­meter a gain up to +10 dB boost can be additio­nally adjusted.
The Lehle Mono 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.
Furthermore, the Lehle Mono Volume has a
buffered direct out which can supply a tuner, DAW
or a second amp without affecting the sound.

Technical data

Weight: 1,620 g
Length: 26 cm (10.24‘‘)
Width: 10 cm (3.24‘‘)
Overall height: 6.6 cm (2.6‘‘)
Voltage: 9 - 15 V DC or 7 - 12 V AC
Power consumption: 50 mA
Frequency range: 50 Hz - 100 kHz (all controls in middle position)
THD: < 0,05 % at 1 kHz, -10 dBu
Impedance input: 2 MOhm
Impedance output: 500 Ohm
Signal-to-noise ratio: -102 dB at 1 kHz, 0 dBu A weighted
(control in “unity gain“ position)
Max level: 3 V RMS (ca. 12 dBu at 12 V input voltage)
Gain control (max amplification): +10 dB

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