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Condenser mics require a very small electrical current in order to operate. This can either come from a battery inside the mic housing, or from the recording device in the form of what's called phantom power (usually marked +48V). WARNING: condenser mics can be damaged by being connected or disconnected while phantom power to them is turned on. Depending on model of camera or audio recorder, it can be easier to turn off the entire device supplying phantom power than to search through extensive lists of menu items to turn off only phantom power. Dynamic mics require no electrical current in order to operate, so are useful for all recording devices, whether or not they supply phantom power.
Finally, memory cards should never be taken out or put in without first turning off the camera or audio recorder.
a. USB: Samson C01U (operator's manual)
form factor: large-diaphragm studio mic
polar pattern: cardioid
type: condenser (power supplied via USB)
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v. Electrovoice RE50/B ([spec sheet|http://www.electrovoice.com/sitefiles/downloads/RE50_B%20Engineering%20Data%20Sheet.pdf]):
form factor: handheld, internal shock mount
polar pattern: omni
type: dynamic
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