Horizontal Drivers and Output
• Input to one or more driver stages is the sweep
generator.
• These stages drive the Horizontal Outout
Transistor.
• Output of power transistor: Deflection yoke
• HOT (flyback transformer)
• Related to this action are: Scan derived voltages, boosted
B+, energizing of convergence and anti-pincushion
circuits, threshold monitoring for auto shutdown and
gating pulses to key tuner functions.
Horizontal Drivers and Output
• Input to driver amplifiers – trapezoid waveshape.
• Driver transistors are transformer coupled (10:1) to output
transistor for low Z match.
• Output stage is class B (class C!)
• Important component for horizontal action is the
DAMPER diode.
• First half of trace is supplied by self induced voltage of
collapsing yoke flux while transistor is turned off. (during
retrace)
• Second half is supplied by output transistor.
Flyback Transformer
• HOT (horizontal output transformer)
• What is the importance of the safety capacitor?
• The enclosed package is called IHVT (itegrated
high voltage capacitor).
• Provides : transformer action
• HV (high voltage tripler action)
• focus voltage
•