PRE (preset) = SETare the pins PRE the same as SET, and the CLR the same as RESET ?
CLR (clear) = RESET
ADDED:
D and CLK should be connected to Ground.
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PRE (preset) = SETare the pins PRE the same as SET, and the CLR the same as RESET ?
I'm struggling to understand the input connections to the pair of opto isolators. I can understand the connection to U1, which will trigger the output when the input is high. How does U2 trigger an output ?