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I try to build an adder using a quad op amp, lm348.
Is the above circuit correct? I heard that op amp need to be bias. What is mean by bias? And how to bias an op amp?
I have only little knowledge on electronic.
It appears to me to be connected as you recommended.In this case I believe the bias is just referring to the plus and minus 15V power.
The pot connection on the last stage is not shown correctly. The wiper of the potentiometer should be shown as going to the inverting input of the op amp.