Picture tube final video driver amplifier
Source: InternetPublisher:刘德华河北分华 Keywords: amplifier transistor resistor Updated: 2021/04/23
Picture tube final video driver amplifier
Shown is the complementary push-pull final video driver amplifier, which is composed of three transistors
. VT511 is the excitation amplifier.
It adopts the form of a common emitter amplifier and has the characteristics of high gain. The R signal is input from the base. Resistor R2 has a current limiting function
to prevent the base current from being too large - the amplified signal is output from the collector and then sent to the base of the complementary push-pull amplifiers
VT512 and VT513. VT512
is an NPN transistor and VT513 is a PNP transistor. , connected to form a complementary push-pull output stage, which is equivalent to two emitter followers. The bias voltage
is provided by 200 V. It has the characteristics of low output impedance and high output amplitude, and provides a driving signal for the cathode of the picture tube.
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