RobG 1,892 Posted August 11, 2011 Share Posted August 11, 2011 Try changing Vdd in your simulator to 12V, that's why you need extra transistor with Vdd pull-up. Also, if you are planning to use it for bigger loads, MOSFETs are a must. Depending on the MOSFET, you may need additional transistors for Q3 and Q4. Or how about something even simpler Quote Link to post Share on other sites
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