[SOLVED] Wien Bridge Frequency Proof 1. The problem statement, all variables and given/known data The ac bridge circuit shown is called a Wien bridge (also Wein bridge). Show that when the bridge is balanced, frequency is found by the Eqn attached. 2. Relevant equations w=2*pi*f Using the number from each branch as a guide, the general solution to AC bridges is Z4 = (Z3/Z1)*Z2 3. The attempt at a solution I keep trying to solve for impedences to plug into the second equation provided, but my j values do not cancel and the equation left is rather messy (R2R4C2C4*w^2 +jw(RzR4C2 -R2C2 -R4C4) +1 = 0. For my impedence values I have been using Z1 = R1 Z2 = R2 -j/wC2 Z3 = R3 Z4 = (R4/jwC4)/(R4 +jwC4) Any help with this would be greatly appreciated.