How would someone test the input impedance of a microphone preamp? I have all the necessary equipment i.e. oscilloscope and multi-meters but I'm struggling to find information on the topic.
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Assuming a preamp has negligible reactive impedance:
Apply oscillating voltage signal of known amplitude. Measure current. Divide. Done!
If trying to do things right: do the same over a range of frequencies.
answered Nov 28, 2017 at 11:26