monster Posted January 23, 2007 Report Share Posted January 23, 2007 Is that possible to design single supply op amp (O-5V) rail-to-rail, to provide a negative ouput voltage? Quote Link to comment Share on other sites More sharing options...
audioguru Posted January 23, 2007 Report Share Posted January 23, 2007 The opamp can oscillate and drive a "charge pump" made with a couple of diodes and a couple of capacitors. Then the negative DC output will be about -3.6V if the load current is low.Use an ICL7660 charge pump IC to create a negative DC supply voltage for the opamp. The output will be -5.0V if the load current is very small and will drop due to its 23 ohms source resistance. So a 10mA load will drop the output voltage to -4.77V. Quote Link to comment Share on other sites More sharing options...
monster Posted January 24, 2007 Author Report Share Posted January 24, 2007 thanks audioguru for the suggested solution. ;D Quote Link to comment Share on other sites More sharing options...
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