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The analog switch multiplexes between channel 1 and channel 2 at the end of each sweep. Controls include Dual Trace/Single Trace mode, sync polarity, sync level, and sync on + or - (rise or falling) edges.
The CMOS 4016 analog switch IC is powered from ground and -15 volts, although not shown in the schematic. The 7820 serves as a level shifter to provide a -10 volt to -15 volts signal to U1.
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