Diode/ frequency signal interuption

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do guys know of can use prevent feeding current besides diode?

we have signal acceptor(frequency in hz) on arduino uno requires lift 4.7k resistor 5v bring signal 0v signal source needs feed computer , don't want voltage lifted signal go computer (not sure if fry). tried putting diode in blocked 5v flow the  computer arduino no longer got proper signal , didn't read correctly assume diode rectifying signal. need circuit or component prevent flow , let signal run clean through. in advanced help!!

not enough info proper answer.
most arduino variants use backflow protection.
a nano uses simple schottky diode, , uno/mega uses p-channel fet.
schematic diagrams can found on site.
leo..


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