Digital amplifier for proportional valves and servoproportional in the closed ring The EDM-J card is a digital amplifier for the control in the closed ring of proportional valves with feedback and servoproportional, for assembly on GUIDE DIN EN 50022 The reference signal is in tension or current. These cards are pre -set in the factory depending on the chosen order code, to optimize the performance based on the valve to which they are combined. The front panel houses the LEDs for diagnostics and operation of the card and a micro-USB port for connection to the EDC software for diagnostics and/or configuration. The EBC software can be downloaded from this page.