help please.. using the parallel port to turn on a solid state relay..

Discussion in 'Homework Help' started by blooandy, Jan 3, 2008.

  1. blooandy

    Thread Starter New Member

    Jan 3, 2008
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  2. mrmeval

    Distinguished Member

    Jun 30, 2006
    833
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    5v from a parallel port is perfect as the SSR you chose needs very little current on the DC side. But here's some parport info in case it's non-standard in some odd way.
    http://www.epanorama.net/circuits/parallel_output.html

    In fact I have an OMRON that draws so little I could piggy back an LED and it still worked.

    Should be 3-32 volts on the DC side and for the AC your line / mains voltage and rated at the max current of both devices + 25 percent. so 100 amp would need 125 amp etc

    There are calculations in the documentation that tell you how to figure out what resistor to use if you use a higher voltage than 3VDC for the control voltage. Damn good specs on those SSRs

    Pay attention to the heatsink requirements. Pay attention to the need for a snubber.
     
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