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Step 3Connect audio signal
There are 3 ways to connect audio signal:
a) Signal ground to “Agnd” on board, in this case analayzer ground and audio ground can not be connected together.
b) Analyzer can be powered symmetric, +-2.5V, “Agnd” will become power ground and audio ground.
c) If analyzer and our output device grounds must be connected together, and there is no way to power analyzer with symmetric supply, you must somehow raise signal to 2.5V height. You can do this by connect the grounds together, raise the signal up with R/R resistor divider (about 100Kohms) connecting them between gnd and supply, signal through 1uF capacitor to resistor divider and then to IN pin.
a) Signal ground to “Agnd” on board, in this case analayzer ground and audio ground can not be connected together.
b) Analyzer can be powered symmetric, +-2.5V, “Agnd” will become power ground and audio ground.
c) If analyzer and our output device grounds must be connected together, and there is no way to power analyzer with symmetric supply, you must somehow raise signal to 2.5V height. You can do this by connect the grounds together, raise the signal up with R/R resistor divider (about 100Kohms) connecting them between gnd and supply, signal through 1uF capacitor to resistor divider and then to IN pin.
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