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(Topic ID: 277394)

Opto Board Recievers Voltage


By Underwood5853

75 days ago



Topic Stats

  • 7 posts
  • 5 Pinsiders participating
  • Latest reply 72 days ago by jabdoa
  • Topic is favorited by 2 Pinsiders

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    #4 74 days ago

    So a diode is pretty much helping you do a voltage divider circuit. Since they give you the current, and you know the breakdown (forward voltage), the formula is:

    (Vsupply - Vforward)/current = series resistor.

    With a 12 volt supply:
    (12-1.7)/0.100 amps = 103 ohms <<-- this is the smallest size resistor to use

    (12-1.7)/0.075 amps = 137 ohms for recommended range.

    I would do a 120 ohm series resistor from your power supply.

    Oh the wattage: p=v x I
    So you will want to use at least a 1 watt resistor.

    Of course a smaller power supply the better. Like maybe drive from a 5 volt source.

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