Optocoupler. +---+--+---+ A |1 +--+ 6| B K |2 CNY17 5| C |3 4| E +----------+ HDSP-L101, HDSP-L201, HDSP-5401, TC07-11 Common row anode 5x7 dot matrix LED display. +---+--+---+ Col1 |1 +--+ 12| Row1 Row3 |2 11| Row2 Col2 |3 5x7 10| Col3 Row5 |4 LED 9| Row4 Row6 |5 8| Col5 Row7 |6 7| Col4 +----------+ HDSP-L103, HDSP-L203, HDSP-5403
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