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Variable Power Supply with LCD



hi i want to program for varibale power supply( -5 to +5 ) to be displayed and i want to calibrate it through the pushbuttons,

i.e for +5v it must show +5v on one time and the same +5 to be showed when i give +2.5v after i calibrate it for span value of 0 to +2.5v(without change in circuitary).

Please guide me.

Very nice