6 SYMBOL voltage 96 -48 M90
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7 WINDOW 123 0 0 Left 0
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9 WINDOW 3 -78 187 VLeft 0
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10 SYMATTR Value PULSE(-5 5 30u 1n 1n 30u 60u)
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11 SYMATTR InstName VCLK
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12 TEXT -64 -240 Left 0 ;2-phase clock generator.\nCould be physically realized with 555 timer.
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