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6.13 VIDEO AMPLIFIER
The video amplifier is Q301, Q302, Q303, Q304, it amplify video signal to about 40Vpp. Video output
signal add to cathode by AC coupling. The DC bias is controlled by the output pwm of IC U201.
Block Diagram
6.14 DIGIT CONTROL
Digit control circuit includes micro processor U1(NT68F659), EEPROM IC(24LC04). With the program,
u-P control all the functions of the monitor. User can control the functions and all the functions shows on
the OSD. The u-P will mute the video signal whenever the mode changes. There will be difference
SW1/SW2 in difference horizontal frequency, Table 5.1 is the switching table:
Table 5.1
Hf<40KHz
SW2
L
Hf>40KHz
H
30
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