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LED State-level test circuit with Dp as decimal point by light open

Lit decimal point as shown dp instructions through open (not tested) the state level test circuit. VT conduction time high, indicating H; low VT cut-off, 7402, 1 foot high, indicating L; probe open, 7402, a considerable input 2,3 feet high, 1 foot low output . As the same time VT, 5 foot R4 down low, only 4 feet high output LED driver dp decimal point.

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LED State-level test circuit with Dp as decimal point by light open