Timeline for In which direction is the microphone signal transported?
Current License: CC BY-SA 4.0
9 events
| when toggle format | what | by | license | comment | |
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| Dec 9, 2022 at 18:15 | vote | accept | Koala | ||
| Dec 4, 2022 at 13:05 | history | edited | Sophie Swett | CC BY-SA 4.0 |
Talk about plugin power
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| Dec 4, 2022 at 12:48 | comment | added | user107063 | @Hearth Not everything you hear is the same. Phantom power is typically 48V through 6.81kOhm on both signal wires of a balanced signal, plugin power is something like 3V through 2.2kOhm (but with a whole lot of variation from about 1.2V to 9V) on the signal wire of an unbalanced signal. The former is used on XLR connectors, the latter on 3.5mm TRS (stereo for video mics), minidot, mini-XLR/TQG and some other wireless mic connectors. There are active adapters for converting phantom power (typical on mixers) to plugin power (typical for wireless and some instrument mics). | |
| Dec 4, 2022 at 8:04 | comment | added | Sophie Swett | @user107063 Ah, I didn't know that! Thanks for the correction. I'll try to fix that part of my answer if I find the time. Now I'm wondering if the signal back from the microphone is generally a voltage signal or a current signal; do you know that offhand? | |
| Dec 4, 2022 at 4:14 | comment | added | Hearth | @user107063 I've never heard that called "plugin power". I've always heard "phantom power". | |
| Dec 4, 2022 at 2:27 | comment | added | user107063 | @Tanner-reinstateLGBTpeople A niggle here: "all three wires are positive about half of the time and negative about half of the time.", nope, untrue. The microphone wire is positive all of the time. This is called "plugin power". It creates a current through the FET in the microphone capsule, and the amount of that current changes with the sound pressure on the mic membrane (and consequently the voltage on the FET's gate). That current changes strength but never direction. | |
| Dec 3, 2022 at 14:41 | history | edited | Hearth | CC BY-SA 4.0 |
you missed a word
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| Dec 3, 2022 at 14:37 | history | edited | Sophie Swett | CC BY-SA 4.0 |
Fix typo (related -> unrelated)
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| Dec 3, 2022 at 14:18 | history | answered | Sophie Swett | CC BY-SA 4.0 |