UK Amateur Radio Full Licence Exam Practice Questions - UK Amateur Radio Full Licence Examination (RSGB Ofcom) Exam

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What is the voltage gain ($A_v$) formula for an ideal inverting operational amplifier circuit with feedback resistor $R_f$ and input resistor $R_{in}$?

A_v = 1 + (R_f / R_{in}) A_v = R_{in} / R_f A_v = -R_f / R_{in} A_v = -(R_{in} / R_f)

Correct Answer:

A_v = -R_f / R_{in}

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