In the circuit next door; a) C1, C2, C3 and C4 capacitors; Whether it is effective at low or high frequencies is imperative. b) Draw the low frequency small signal equivalent circuit and find the expression of the lower corner frequency. c) Draw the high frequency small signal equivalent circuit and find the expression of the upper corner frequency. d) Draw the amplitude Bode diagram of the circuit. C1 R1 M +18 V i R2 R3 R4 www R5 C2 C3 7c R6