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US 4,124,211 AGranted
Circuit for use in electronic game of nim
OwnerRoy R. Worrallinventor
Life of this patent
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Abstract
An AND gate has a first input biased ON and a second input normally biased OFF. A switch selectively biases the second input ON. The output of the AND gate is fed back to the second input to bias the second input ON when the output is ON. A transistor connected in a common collector configuration has its base electrode connected to the output of the gate. A light-emitting diode is connected in the emitter circuit of the transistor.
Claims5
A circuit for use in an electronic game of nim, said circuit comprising
- a source of electrical energy;
- an AND gate having a first input, a second input and an output;
- first biasing means connected to the first input and including the source of electrical energy for biasing said first input at an ON level;
- a player operable switch connected to the second input for biasing the second input to an ON level when the switch is closed, thereby switching the AND gate to its conductive condition;
- a feedback network connected between the output and the second input for biasing the second input at an ON level when the output is biased at an ON level;
- a light source;
- and
- second biasing means connected to the second input, for normally biasing said second input at an OFF level whereby said AND gate is normally in its low output condition, said second biasing means including the source of electrical energy, and switching means connected between the light source and the AND gate, said switching means energizing said light source when said AND gate is in its high output condition.
5 more elements
Dependencies are inferred from the claim text.