Determine the ac parameters for this BJT circuit. Note: DC biasing voltages and currents need to be computed FIRST before calculating the AC parameters of gains and impedances 80 mV www +10 V R₁ 18 ΚΩ R₂ 4.7 ΚΩ Rc · 1.5 ΚΩ hFE hfe www11 HE = 30 = 200 RE 1.2 ΚΩ +1₁ ww11 CE RL 5.1 ΚΩ

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