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Messages - medengineer

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Please don't flame me, I am a metallurgist, not an EE. 

I have just started playing around with trying to use the Signalscope
as a real scope around our lab.  Any help with the right
circuit to be able to input DC and AV voltages would be appreciated. 

Getting some initial data I hacked a mic cable and I am getting 2.7V DC output to the mic. 
At 4M ohms it seems to trigger the play/pause function of iTunes.  I have not gone above
that yet to see what impedance triggers that function.

Any suggestion on the circuit, without blowing up any chips in my phone. 

I can spin a circuit board once I know what to build.

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