Electronics Handbook/Circuits/NPN Transistor Configurations/Amplifier with 2 Resistors

Analysis

 * $$V_B = V_i $$
 * $$V_E = V_B - 0.7 = V_B$$
 * $$I_E = \frac {V_E} {R_4} = \frac {V_B} {R_4}$$
 * $$I_C = I_E$$
 * $$V_C = V_C - I_C R_3$$


 * $$V_C = V_i (1 - \frac {R_3} {R_4})$$