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.
Red Flag Submitted
Thank you for helping keep Eng-Tips Forums free from inappropriate posts. The Eng-Tips staff will check this out and take appropriate action.
Reply To This Thread
Posting in the Eng-Tips forums is a member-only feature.