Buchla LEM218
A touch-activated voltage source for the Buchla 200 series, with two independent control channels.
Overview
The Buchla LEM218 is a Touch Activated Voltage Source built by Buchla USA for the Buchla 200 series modular systems. It has two independent channels of capacitive touch control. Each channel generates control voltage based on applied pressure. It gives you voltage output plus gate/trigger signaling, so it works as a dynamic, expressive performance interface.
Specifications
| Dimensions | 8.75" x 4.5" x 1.75" |
| Weight | 1.5 lbs |
| Power requirements | +15V @ 20mA, -15V @ 20mA |
| Outputs | 2x 1/4" jacks |
| Controls | 2x Pressure plates, 2x Tuning knobs, 2x Pressure knobs, 2x Gate buttons, 2x Gate LEDs, 2x Octave switches, 2x Range switches, 2x Mode switches |
Design
Each of the two channels has a capacitive touch pressure plate that outputs a voltage proportional to applied pressure. A tuning knob adjusts the output offset voltage, and a pressure knob sets sensitivity. The gate button sends a trigger signal, and the gate LED shows it. The octave switch shifts output by one octave. The range switch selects between 0-5V and 0-10V output ranges. The mode switch sets the gate output to V-trig, S-trig, or Gate mode.
Context
The LEM218 is built as a control interface for the Buchla 200 series modular electronic music systems, adding tactile and expressive control.
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