1-) Calculate the spectral transmittance of the circuit below; calculate output voltage Vout while R=1K ohm, C=1 microfarad and Vin=2sin(wt+Pi/2), w=1000 rad/s.

2-) Calculate diode current Id in the circuit below while R=1k ohm and E= 2.1 V

(Udf=0.7V). Recalculate Id for the diode additionally connected in parallel with R.

3-) Calculate the operating point for the transistor supplied as beside while Rb=30k ohm, Rc=100 ohm, Vcc=10V, Ube=0.7V and B(beta)=100A/A. In what mode the transistor is working?