[sdiy] Measuring Input and Output Impedance

[David G. Dixon]

> I was looking at the following page and wondering...
> 
> http://www.learnabout-electronics.org/ac_theory/impedance73.php
> 
> Can I substitute a (modular's) module for the 'amplifier' in these
> examples and know what my module's i/o impedances are?

Why not?

Alternatively, you could just look at the input resistors.  The impedance of
any input through a resistor into an inverting opamp (which describes most
module inputs) is simply the value of the input resistor.  If there is a
attenuator pot in the line, then this creates a divider into a parallel
resistance, depending on the pot setting, and a bit of algebra is involved.