From the eagle control panel, double click onto the "ac" schematic symbol. The schematic editor will rise, containing this schematic:
You will find again a green textline which now tells spice3 to perform an small signal AC analysis. Spice3 will override the original attached DC value for V1 and uses the atttached AC-value, which is 1V. Then it will ramp it up the frequency of this source from 1Hz to 10KHz, stepping up logarithmically in 10 steps per decade. All parts will be modelled with their small signal behaviour. The upper instrument P2 is really a VMETER device that now behaves as a dB-currentmeter, because we attached a value of IDB. The lower instrument P1 has a value of VPH which makes it behave as a phasemeter. Press F12 to see the results.
Again you may experiment with the circuit. Perhaps you may like to see the dB voltage response and change the value of P1 to "VDB".
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