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Ex-Genius needs help

Discussion in 'General Electronics Discussion' started by VictorTango, Jul 8, 2009.

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  1. VictorTango


    Jul 8, 2009
    I am working on a project and I need a bit of help. Here's the scenario;

    I am using a CYC63743C USB controller and want to run an isolated 17V relay. I am trying to use a 4n35 optocoupler to run the relay but can't seem to get the 4n35 to fire (or so it seems). I have tried using a 1k resister (and many other values) in line with the 5v i/o pin on the USB controller but can't get the relay to fire (on the output side of the 4n35). I believe I have everything wired correctly as far as polaruty is concerned.

    Perhaps I am incorrect in believing I can use the 4n35 to act like an analog switch. I need some way of firing the 17V relay and definately want an isolated circuit. Anybody have any ideas? I need to keep it as low cost as possible.

  2. neon


    Oct 21, 2006
    a rerlay means mucho power you are killing the 4n35 try to add a power transistor or some kind of power driver then it will work.
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