22-03-2014, 10:09 AM
Push Pull Amplifier
Aim:
To obtain the maximum power output of the given push pull amplifier, find its efficiency
and to draw load versus power output curve and to study the cross over distortion.
[b]Procedure:[/b]
1. Connect the DC supply (12 V) to the circuit form the source.
2. A sinusoidal signal of frequency 1 kHz with amplitude say 5mV is applied to the input of
power amplifier.
3. Connect a loud speaker at the output across the secondary of output transformer Tr2
4. Adjust the resistance R2 to hear proper sound. If the sound is heard the circuit is said to
be under working.
5. Replace the loud speaker with a variable load (RL) impedance.
6. Tabulate the load impedance and output voltage.
7. Draw the graph between load impedance (RL) and output power (PO).
8. Find the maximum power for the optimum loud. Calculate the % efficiency.