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Recent content by cdarga

  1. cdarga

    open collector output driving a relay

    Thanks again Bob. The rating on my transistor for max current (connector current) is 0.5A. For the zener diode, would any size below 0.5A work? For example, I see a diode that's rated at 24V, 5.2mA. This means the most current that could flow "backwards" would be 5.2mA? This is obviously...
  2. cdarga

    open collector output driving a relay

    Thanks so much BobM3! That diagram is exactly what I needed. Thanks to the others who put in their input as well. Now, 1 more question, there is a diode already implemented in the DAQ device (no specs given for it). Since I'm not sure of the specs on the diode in the DAQ system, it probably...
  3. cdarga

    open collector output driving a relay

    Hello, Let me start out by mentioning that I am in NO WAY an expert in the electrical dept...so please forgive me. I have a DAQ system with an open collector output with a 100k pull up resistance (not really sure what that means). I have 2 wires: COM ground (emitter?, pink) and alarm output...

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