The transistors Q1, Q2 forming the differential amplifier circuit at the entrance
to.
Q3, Q4 is floor buffer amplifier.
Q5, Q6 Darlington circuit is coupled to the DC service, increase the
amplification and acquired CC line should low output impedance.
the signal retrieved on polarization resistors R4 emitter for Q6, Q7, Q8
is the current source for the differential pair Q1, Q2 and Q3 and Q4.
Output voltage in phase with the voltage V0 at on B of Q1 and
reverse-phase with the input voltage on the B of Q2. This entrance, called the
entrance is not the island (+) and the entrance to the island (-).
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