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2. Microphone connector - Wikipedia

   en.wikipedia.org/wiki/Microphone_connector

   Two pins are used for the mono headphone signal and two pins for the unbalanced microphone signal. The 4-pin XLR connector is also commonly used on amateur radio microphones, but transferring unbalanced audio instead, and using the 4th pin (with the common ground) for a push-to-talk (PTT) circuit activated by a button on the microphone.

3. Phantom power - Wikipedia

   en.wikipedia.org/wiki/Phantom_Power

   This results in a 12-volt potential difference with significant current capability across pins 2 and 3, which would likely cause permanent damage if applied to a dynamic or ribbon microphone. Plug-in-power (PiP) is the low-current 3–5 V supply provided at the microphone jack of some consumer equipment, such as portable recorders and computer ...

4. Audio and video interfaces and connectors - Wikipedia

   en.wikipedia.org/wiki/Audio_and_video_interfaces...

   † Although the mic input is usually mono, the input is still a TRS phone socket. Many mono 'computer' mics are fitted with TRS plugs. The tip is for the MIC and the ring is for power (to power an electret-condenser style MIC). There are exceptions to the above: Hosa cables use grey and orange for left and right analogue channels.

5. Phone connector (audio) - Wikipedia

   en.wikipedia.org/wiki/Phone_connector_(audio)

   The microphone generates its own voltage and needs no power. Devices that use a self-powered microphone: usually a condenser microphone with an internal battery-powered amplifier. Devices that use a plug-in powered microphone: an electret microphone containing an internal FET amplifier. These provide a good quality signal in a very small ...

6. Microphone - Wikipedia

   en.wikipedia.org/wiki/Microphone

   3.5 mm (sometimes referred to as 1 ⁄ 8 inch mini) TRS (tip, ring and sleeve) stereo (also available as TS mono) mini phone plug on prosumer camera, recorder and computer microphones. USB allows direct connection to PCs.

7. Zoom H2 Handy Recorder - Wikipedia

   en.wikipedia.org/wiki/Zoom_H2_Handy_Recorder

   The input jack for external stereo microphones supports plug-in power. [7] The H2 has built-in microphones, but allows external ones to be used if different characteristics are required. Unlike the H4, the H2 makes no provision for multi-track recording , but its 360-degree polar sound recording can record in 4 channel audio, which can later be ...