Consider the circuit in figure4. Derive the second order differential equation for Vout in terms of R1, R2, R3, R4, R5, C1 and C2. Then find the maximum value for RS that which d?v + A dv = 0 have dt makes Vout pure sinusoid. (Hint: differential equations of type dt2 pure sinusoid solutions) R1 R3 10K C2 10nF +12V Vout -12v R2 10K C1 10nF R4 3.9K 100 RS Figure 4: Sinusoidal Oscillator