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That metal-cased lousy old 741 opamp was made in 1979. I was too busy disco'ing and celebrating the birth of my daughter to notice the metal cases in those days.erikl said:See here.
The device has been introduced by Fairchild in 1968. At least during the 70th, most professional instruments used metal canned analog ICs,That metal-cased lousy old 741 opamp was made in 1979.
Vout = (2/3* Vin + Vref/3)*3.6 = 2.4*Vin + 1.2*Vref