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This module is a simple two channel attenuverter and voltage source. An attenuverter takes an input voltage and allows you to attenuate and invert the voltage (i.e. 4.2V input would allow you to create new voltages ranging from -4.2V to +4.2V). With no input present, the module acts as a voltages source (-5V to +5V range). As with all Hungry Robot "Modular Boxes" the Attenuverter can be powered with a simple 9V DC, Negative Center power supply.