Thought I'd try in here:

Discussion in 'The Projects Forum' started by marshallf3, Jun 10, 2011.

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  1. marshallf3

    Thread Starter Well-Known Member

    Jul 26, 2010
    Posted this to anothe forum and got some half decent suggestions however I'm wanting opinions as to thether this would wok.

    I've got a 5V logi IC open collector, output active low and I'm trying to control a 21V unregulated voltage such that it will control a 12V incandescent lamp drawing up to 2 Amps.

    Control control signal is open collector, lightly pulled up to 5V and it's only capable of sinking 2.5 mA thus I'll need an inverting amp with a minimum gain of 800.

    5V is regulated to +-2%, +12V can vary from +11.6V all the way up to +15.5V max as it comes of a simple alternator/battery supply. I prefer to switch the = supply wire to simplify hookup.

    Think this will work?

  2. bertus


    Apr 5, 2008
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