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# 13.9.9C: The Wien Bridge

Figure $$\text{XIII.11}$$

This bridge can be used for measuring frequency.

The reader will, I think, be able to show that

$\dfrac{R_4}{R_3} + \dfrac{C_3}{C_4} = \dfrac{R_2}{R_1} \tag{13.9.8}\label{13.9.8}$

and

$\omega^2 =\dfrac{1}{R_3R_4C_3C_4} \tag{13.8.10}\label{13.9.10}$