I can see another difficulty with harii's design:- The estimates of Vout are correct at the 2 extremes of the variable potentiometer VZ1, but will be poorly controlled at intermediate positions.Please find my attachment. I have drawn this circuit only for this post.
As others have said, you will need to specify the maximum current expected at the output.i want to use voltage dividers with 7805 and 7812
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Is it possible to use divider like this with voltage regulator.?
1. You must always provide a higher voltage at the input to a 78xx regulator than its output voltage. This should be a minimum of 2.5 volts higher than the output voltage. For example, your voltage dividers would be calculated to provide 7.5 volts for the input to the 7805.i need the output current of 1mA at both op pins i.e for 12V and for 5 V
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