Lehle volume Lehle Mono Volume

The Lehle Mono Volume is a mechanical wear-free volume pedal equipped with a high-precision magnetic pickup. This sensor uses the Hall effect, discovered by Edwin Hall, which measures the strength of a magnetic field. The Hall sensor of the Lehle Mono Volume is made in Germany and precisely calibrated to the built-in magnet and the stroke of the rocking plate. The plate only moves the magnet, the distance of which is measured by the Hall sensor which, itself, controls a VCA (Voltage Controlled Amplifier, that is to say voltage-controlled amplifier). Made in the USA, the high-quality Blackmer VCA replaces the mechanical potentiometer here. The principle of the voltage controlled amplifier is based on the fact that the amplification varies according to the voltage coming from the Hall sensor. This process allows a much more precise operation than the mechanical potentiometer or the optical sensor of conventional volume pedals, especially as the potentiometer noise disappears and tedious calibration becomes superfluous. The Lehle Mono Volume reproduces all the frequencies of the instrument over the entire travel of the platter. The input and output impedances always remain the same. There is therefore no treble attenuation effect as with a potentiometer. Inside the pedal, the supply voltage is rectified, filtered, stabilized and then doubled to reach 18 volts. Thus, the pedal resists very well at all levels and reaches 110 dB of dynamics. The variation in volume applied by the Lehle Mono Volume ranges from -92 to 0 dB, i.e. almost nothing up to the unit volume. A potentiometer allows to add an amplification of approximately +10 dB. The Lehle Mono Volume operates very quietly and evenly as it is equipped with low friction sliding bearings made of high quality polymer to eliminate mechanical transmissions from the chainring to the other components. An adjustment screw allows very precise adjustment of the resistance of the plate. The Lehle Mono Volume also has a direct output with buffer amp. It allows you to feed a tuner, a computer music system or a second amp without coloring the sound.