Tech Square

RE: Does reducing gain increase input impedance?

64.24.177.119

In Reply to: RE: Does reducing gain increase input impedance? posted by Nietzschelover on January 22, 2008 at 20:48:10

Put a 1Mohm pot (or maybe 100Kohm for lower impedances) in series with what's driving it (hopefully something low impedance like a sig gen) and feed in a steady tone. Increase the resistance of the pot until the signal is reduced by exactly half. Go measure the resistance of the pot. That's the input impedance of the device. You're just making a voltage divider. When the two resistors (the pot and the input Z of the device) are equal, the signal will be divided by two.

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