Find the value of Resistance

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##### Question

Is there any tool to find the I/O Resistance in any circuit.

Eg;

In Voltage-Series Feedback circuit using UA741, How to find the feedback resistance ( Rif and Rof ) ?

In a question it is asked to find out Avf,Rof,Rif for a given feedback circuit ?

Oscad General

__Answers:__

Do you wanted to know input impedence and output impedence or feedback resistance?. In case of feedback resistance it is usually known(i.e circuit designer only chooses it). If you want to know input impedence and output impedence, then, you will have to put some known current/voltage sources at input/output and plot the voltage/current values respectively and then, calculate the resistance(v/i). pls let us know if this answers your question.

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