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...roject_notes/Audio_notes_-_microphones#Plug-in_power_.2F_Bias_voltage|bias voltage]] for such electrets to function : using headphone out for line out is safe (because the voltage is the same, and line ins have higher impedance) ...

Most are high-impedance low-current/low-voltage sources, One way to reduce that is to use the sensed voltage and drive that back into the person. ...

...roject_notes/Audio_notes_-_microphones#Plug-in_power_.2F_Bias_voltage|bias voltage]] If this is a controlled scene, then it can be most convenient to use a very directional mic, and a ...

Add a constant voltage to the signal you put on the head. ...ctions (distance to tape, roll along tape) of a head are fixed and/or well controlled. ...

...of using turning gas to heat by burning, or electricity to heat with a big resistor, is roughly 1. (In part because losses tend to be heat, which in this case Yes, you could open the window, but more controlled in terms of humidity but also the actual temperature, ...

The larger issue is that it can set up voltage differences. ...re harmless because of that small amount, because their generation is well controlled, ...

Voltage: It frequently does little more than push data through with some well controlled timing. ...

...s don't need extra wires in a TRRS plug because they'll be using different resistor values between mic and ground pins. ...historically seen in loudspeakers, though I've also seen them used for low voltage lighting [[File:Speaker_din_male_and_female.jpg|thumb|right|215px|DIN 41529 ...