Your effective input impedance is the parallel combination of 4k7 and 18k.
Formula is R1*R2/(R1 + R2).
HTH
BrianT
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Impedance is the parallel combination
Your effective input impedance is the parallel combination of 4k7 and 18k.
Formula is R1*R2/(R1 + R2).
HTH
BrianT
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