Ok.. Here is the problem. I was studying about the transformer coupled classs B push pull amplifier ( using 2 npn transistors ).
The input signal is connected to a transformer which produces 2 out of phase signals ( centre tapping provided). Each of these 180 out of phase signals are supplied each to a npn transistor.
This means that Transistor 1 conducts during the first half cycle ( when input to it is positive and input to second transistor is negative ) Transistor 2 conducts during the second half cycle ( when input to is positive and input to first transistor is negative).
The output of both transistors go to an output transformer whose centre tap is connected to +Vcc. And a sinusoidal output is obtained..
Here comes my confusion...
My textbook ( Electronic devices by floyd) shows that first half cycle by T1 and undergoes a 180 degree phase shift and comes out as a negative half cycle... Similarily the second half cycle by T2 undergoes a 180 degree phase shift and comes out as a negative half cycle...
But 2 negative half cycles given as input to a centre tapped transformer CANT surely bring about a correct sinusoidal waveform as output ...Can they????
P.S if nobody has understood my doubt , i will try to upload a picture next time to make it clearer.
Thanks in advance , people.
The input signal is connected to a transformer which produces 2 out of phase signals ( centre tapping provided). Each of these 180 out of phase signals are supplied each to a npn transistor.
This means that Transistor 1 conducts during the first half cycle ( when input to it is positive and input to second transistor is negative ) Transistor 2 conducts during the second half cycle ( when input to is positive and input to first transistor is negative).
The output of both transistors go to an output transformer whose centre tap is connected to +Vcc. And a sinusoidal output is obtained..
Here comes my confusion...
My textbook ( Electronic devices by floyd) shows that first half cycle by T1 and undergoes a 180 degree phase shift and comes out as a negative half cycle... Similarily the second half cycle by T2 undergoes a 180 degree phase shift and comes out as a negative half cycle...
But 2 negative half cycles given as input to a centre tapped transformer CANT surely bring about a correct sinusoidal waveform as output ...Can they????
P.S if nobody has understood my doubt , i will try to upload a picture next time to make it clearer.
Thanks in advance , people.