To investigate the capacitor$-$coupled complementary push$-$pull class$-$AB power amplifier.

Supplementary Notes for the Experiment:

Fig. $1$ shows how a push $-$pull amplifier can be constructed without using a driver or an output transformer. Note the complementary $($NPN and PNP$)$ transistors, Q$1$ and Q$2.$ When $V_s$ is positive, NPN transistor Q$1$ conducts and PNP transistor Q $2$ is cutoff. When $V_s$ is negative, Q$1$ is cutoff and Q$2$ conducts. For optimum operation, all components must be closely matched, in which case the DC voltage at point A is $\frac{V_{cc}}{2}.$ Coupling capacitor $C_c$ prevents the DC voltage from appearing in the load and eliminates the need for an output transformer. The coupling capacitor affects the low$-$frequency response of the amplifier. The lower cutoff frequency due to $C_c$ is:

$f1(Cc)=\frac{1}{2(RL+RE)CC}$

Fig $1.$ Push$-$Pull Class$-$AB Power Amplifier Circuit. Please comment for the experiment