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TR2 and TR3 are biased
in class B, which means
that they are normally
non conducting when
there is no signal
input.
TR1 and T1 form a phase
splitter, opposite
polarity signals
appearing at the ends of
T1 secondary.
When there is a signal
in ,TR2 conducts on the
positive half of the
waveform only and TR3
conducts on the negative
half.
Current flows down
through the top half of
T2 primary when TR2
conducts, and up through
the bottom half when TR3
conducts.
Both halves are combined
in the secondary of T2
to produce an amplified
version of the input.
R1 and R2 apply a small
forward bias to avoid
crossover distortion,
which is shown in the
lower waveform.
This
distortion is caused by
the non-linear
characteristics of the
emitter/base junction.
(for more details see
the junction diode
Vb/Ib
curves).
The advantage of this
circuit is that there is
very little current
taken if there is no
signal input.
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