I had a question regarding open collector outputs. I want to use a digital output card to drive a opto relay. The led If is 7mA. I don't want to switch the common. I want to set the digital output to go high and provide 5V to the opto relay and source the current. Well I am not sure if the output is capable of sourcing that much current. The digital output can definitely sink the opto relay led current but like I said I don't want to switch the common or cathode of the LED. I could interface the digital output's open collector and drive it with a PNP transistor. OVerall I am trying to switch on one of the Crydom or Crouzet Solid state AC relays that require 3-32VDC with 8mA current.
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