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7 VIDEO AMP. CIRCUIT
A. VIDEO PRE. AMP.
The video pre-amp IC is U301 (M52743). The input signal is 0.7Vpp, then pre-amp IC U301
amplify the video signal to 4~5Vpp. The WHITE BALANCE and CONTRAST can be adjusted
2
internal by I
C bus. Fig.4 is the block diagram.
B. VIDEO AMPLIFIER
The video amplifier is U303 (LM2435), 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 U302.
Fig.5 is the block diagram
BLOCK DIAGRAM
M52743SP Block Diagram
Fig .4
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