cyw1984 Posted September 7, 2005 Report Share Posted September 7, 2005 I have couple of questions of this project.http://www.electronics-lab.com/projects/power/003/index.htmlHow could it change the P1 and P2 to be Vref for D/A convertor 0-10Vand how to caculate the resistor????Thanks a lot Quote Link to comment Share on other sites More sharing options...
audioguru Posted September 8, 2005 Report Share Posted September 8, 2005 Hi Cyw,Have you seen our discussion of this project to stop it from "thermal meltdown" and to make it work properly? http://www.electronics-lab.com/forum/index.php?topic=128.0The output stage has a gain of R12/R11 + 1 = 3.074 so with an accurate 10.0V replacing P1 and if the resistors are also accurate then the output voltage of the project will be 30.74V if the project is modified like in our discussion to go that high.Replacing P1 with 1.0V would give an output voltage from the project of 3.074V etc.Replacing P2 with a voltage source is slightly more complicated because you must include the voltage drop across the current-sensing resistor R7 in the calculation involving the voltage divider of R17, P2 and R18. ;D Quote Link to comment Share on other sites More sharing options...
cyw1984 Posted September 8, 2005 Author Report Share Posted September 8, 2005 O..thanks audioguruit's really complicated ????If I want to set the output voltage and current limit with DAC's~~How can i improve this circuit?? Quote Link to comment Share on other sites More sharing options...
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