Led indicates logic states

Posted on Jul 21, 2012

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
Click here to download the full size of the above Circuit.

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

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