single supply operational amplifier negative voltage reference

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fjpompeo

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Dear sirs,

I need to build a negative voltage reference (commom VCC not GND) using a LM741, a zener and some resistors. Can you help me? Please take a look at the attached drawing it speaks for yourself. VCC=18Vdc~25Vdc. It will be used as a voltage reference in a negative rail regulated power supply so the positive rail goes from the smoothing capacitor to the output without regulation.
 

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So you need two different supply (with separate ground isolation). Yes you can give 5V supply in reverse polarity (Vcc grounded) to get the negative reference. I don't know the application of this circuit , but you can use some IC Chips like ICL7660
 

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