Q :
Why input effect is usually worth about 1M (high impedance) and the output has a value of about hundreds of kilo ohms? is there a reason behind that fact?
A :
if there is a pulldown resistor at the output effect 100K worth A, then they will be connected to the output when the input B which has the effect of 1M pulldown resistor at the input, the effect of A will 'feel' a resistive load of ~ 90K (100K parallel with 1M).
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