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on an amplifier I found at the input 4 resistors of 0 ohms. What is their role and how does this circuit work? enter image description here

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    \$\begingroup\$ This circuit can be used in different combinations: non inverting or inverting. By placing or leaving out those 0 Ohm resistors we can choose which configuration we want. And WHOA, we can use one PCB design to make either configuration. 2 circuits but one PCB. It is a common thing in many devices. \$\endgroup\$ Dec 2 '20 at 14:52
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  • For a non-inverting amplifier R4 = 0 and R5 = \$\infty\$
  • For a non-inverting amplifier R6 = 0 and R7 = \$\infty\$

And,

  • For an inverting amplifier R5 = 0 and R4 = \$\infty\$
  • For an-inverting amplifier R7 = 0 and R6 = \$\infty\$
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