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The approximate curve of interlocking p+n FET circuit with RL of 7.1 MΩ (red solid curve). The blue dash curve is the fitting curve of the maximum points from five solid curves of n-type FET 2SK427 circuit with RL 7.1, 10, 20, 30 and 50 MΩ respectively. And the fitting curve formula is R=4.59I-1.04 (r2=0.992).
