Posted on Oct 18, 2012

Only one LED can be on when the circuit is at rest. Which LED is illuminated is determined by the touch pick-up that last had human contact. Pickup terminal A controls the on condition of LEDl, and terminal B controls the on condition of LED2.

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

A 4001 quad two-input NOR gate is connected in an anti-bounce latching circuit that is activated by touching a pickup.

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