The switching circuit shown below converts a 0 to 6 V pulse into a 10 V to 5 V pulse. Determine the values of the components, Rb, Re and Rc given that the current gain is 50 and the maximum current drawn from the 10 V power supply is 10 mA. Assume Vbe = 0.7 V. Solution if input voltage is o, the output voltage is 5V (10-5=5)V from graph RC=(Vcc-Vout)/Ic=(10-5)/10m=500 ohm RE=5/10m=500 ohm beta=IC/IB IB=10m/50=0.2mA RB=(6-(0.7+5))/0.2m=1.5 kohm.

1. The switching circuit shown below converts a 0 to 6 V pulse into a 10 V to 5 V pulse.
Determine the values of the components, Rb, Re and Rc given that the current gain is 50 and the
maximum current drawn from the 10 V power supply is 10 mA. Assume Vbe = 0.7 V.
Solution
if input voltage is o, the output voltage is 5V (10-5=5)V from graph
RC=(Vcc-Vout)/Ic=(10-5)/10m=500 ohm
RE=5/10m=500 ohm
beta=IC/IB
IB=10m/50=0.2mA
RB=(6-(0.7+5))/0.2m=1.5 kohm