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This circuit blanks the CRT starting just before retrace begins. Since the CRT sits at a -1200 volt potential, the blanking circuit must also be based at -1200 volts. Note the capacitors, C40, C41, and C43 which allow the gates that drive the intensity grid of the CRT to be isolated from the other electronics within the oscilloscope.
Return to Main Oscilloscope PageMike Ellis, 1999, All Rights Reserved