Edgar Aichinger <edogawa@xxxxxx> writes: > Am Sonntag, 11. April 2021, 15:00:49 CEST schrieb David Kastrup: >> Alf Haakon Pietruszka Lund <alf@xxxxxxxxxxxxxxx> writes: >> >> > I see I missed a small but important point; these are condensator >> > mikes. Yikes... >> >> Yes and no: electret condenser. They don't need phantom power for >> polarising the capacitor capsule as it comes prepolarised. But they do >> need some power (typically 3V–6V) as plugin-power to power the built-in >> FET preamplifier without which the weak capsule signal would not make it >> through the microphone cable. >> >> The infamous Neewer BM800 can convert phantom power to plugin power and >> thus can be run on either depending on the cable type (while providing >> S/N ratios that are not impressive for either application). >> >> But a lot more typically, devices only work with one kind of power. The >> kind of soundcard/computer providing 3.5mm TRS (or TS) microphone inputs >> tend to carry plugin power (sometimes switchable by software), XLR >> inputs tend to have an option for phantom power (almost always +48V >> these days), sometimes switchable in groups. >> > While I'm all for using better equipment, I wonder if this mic really > needs phantom or plugin power (I don't even know that term) Cheap compact microphones invariably are electret condenser and invariably need a power source: plugin power, 1.5V battery or something else. > If it's designed for a laptop headset jack, that wouldn't supply that > either? Laptop headset jacks invariably provide plugin power. > It can probably get that power from USB. USB soundcards can also power actual phantom power since the actual current requirements are low, so a stepup converter will make for +48V if you manage to design it in a manner not contributing converter whine into the sound experience. > Anyway, the Amazon product page talks about batteries, and I know that > cheap and not so cheap (I had one by Sony) electret external stereo > mics with mini-jack plug for home video cameras etc. existed long ago > already. Invariably using plugin power unless they require their own batteries. -- David Kastrup _______________________________________________ Linux-audio-user mailing list Linux-audio-user@xxxxxxxxxxxxxxxxxxxx https://lists.linuxaudio.org/listinfo/linux-audio-user
