Using C = 1.6 nF, find the value of R such that the circuit of Fig. 18.12 produces 10-kHz sine waves. If the diode drop is 0.7 V, find the peak-to-peak amplitude of the output sine wave. How do you modify the circuit to double the output amplitude? (Hint:Asquare wave with peak-to-peak amplitude of V volts has a fundamental component with 4V/π volts peak-to-peak amplitude.)