analog optocoupler

Discussion in 'The Projects Forum' started by vwdevotee, Jul 30, 2009.

  1. vwdevotee

    Thread Starter New Member

    Jul 19, 2009
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    I'm looking to isolate a charging circuit (buck boost) from it's control circuit but am unsure of using an analog optocoupler. When I look at teh data sheets for them they seem to translate a voltage on one side to a current on the other. Is there a way to put a voltage on one side and get a scaled (but still linear) voltage out the other side? Thanks for the help!
     
  2. rjenkins

    AAC Fanatic!

    Nov 6, 2005
    1,015
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    Simply put a resistor in series with the opto's transistor, across your control supply.
    As the opto current increases, the voltage across the resistor increases in proportion. A 10K resistor could be a good starting point & change value if that does not work.
     
  3. bertus

    Administrator

    Apr 5, 2008
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  4. vwdevotee

    Thread Starter New Member

    Jul 19, 2009
    8
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    Thanks a bunch. That helps a lot. As a mechanical engineer I'm still getting used to working with electronics too.
     
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