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Jewell Jim Ebers > theoretical model of the P-N-P-N switch
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However it would be the Bell Labs research scientist Jewell Jim Ebers who produced the first theoretical model of the P-N-P-N switch. But in 1952, he published a paper which conceptualized the switch as a larger circuit consisting of two stacked and interconnected transistors.

“However it would be the Bell Labs research scientist Jewell Jim Ebers who produced the first theoretical model of the P-N-P-N switch. But in 1952, he published a paper which conceptualized the switch as a larger circuit consisting of two stacked and interconnected transistors.”