Calculate Ic, Vcc, β, and RB for the circuit shown below

a) To what value R must be adjusted in the following circuit to make IZ = 70 mA. Assume VZ =20 V at 65 mA and ZZ = 23 Ω. What is the Zener voltage at 70o C, if it has a positive TC of 0.08 %/oC.? b) Using a Complete diode model, find the diode current (ID), diode voltage (VD), and output voltage (Vo) for the diode circuit shown below. Given that: Vs = 20 V, RL=3 kΩ , Barrier Potential VF = 0.3 V , and r’d = 70 Ω. If the diode was reversed and IR = 200 µA, Determine the diode reverse voltage (VR)

6. For the following circuit, calculate the required capacitor and resistor combination to limit the rate of change of voltage (dv/dt) across the SCR to 20V/us. Vin - 480Vrms, VORM 800V and di/dt rating is 48A/us. What is the outlined circuit called and what is its purpose? W VSIN R₂ www 100

Consider the circuit given, where R= 3 Q. lic 48 a3 X=0 10u(-t) mA 2 mF ? VC 250 mH Determine icO™). (You must provide an answer before moving on to the The value of ido*) is A. ell