analog help

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  1. - 23rd September 2008, 12:30 #1
    cphillips82's Avatar
    cphillips82
    cphillips82 is offline Junior Member
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    Default analog help

    just wondering if somebody could give me a hand with some old ohms law, I am using the hpwm command to a 4n35 isolater so I can interface with a hendon OM5428 phase controller IC. This chip supplies me with 0v and -14v dc of which I need about -.3v to -7 volt to control the chip's phase output.I have managed to do this with a little persistance and dumb luck in putting a circuit together but it doesnt work well enough, by which I mean out of the commands 255 most of the dimming occurs from 0 to full bright at about 50 and I'm all out of ideas
    anyone??
    p.s dodgy pic of circuit included
    Thankyou in advanced
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