Led indicates logic states

  
The LED is the CSL310L which contains a red LED and a green LED connected back to back and mounted close together in a single moulding. The LED can emit red or^green light by controlling the polarity of the applied voltage and if the polarity is switched at a rate of several hundred Hertz the emitted light appears yellow. The four combinations of inputs A and can therefore be converted to four LED states—red, green, yellow and off.
Led indicates logic states  - schematic

The truth table shows the LED colors corresponding to the combinations of A and levels.




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