curious about whether or not my DIY mics would work with my phone so i did some digging and experimenting. after using several adapters to get the mic signal to the correct portion of a TRRS plug it works! though the adapting is pretty particular…
i’ll explain: i wired my mics individually with TRS plugs. i wired the signal to both the tip and the ring with the hope that if i used one of them in a stereo recorder i would effectively get a mono recording. i’m curious if that was a mistake and will have to test with it more in the future. To make stereo recordings with both mics i searched out a dual mono female 1/8" to stereo male 1/8" adapter (which took longer to find than i expected).
The TRRS connector on the iPhone uses the CTIA (or AHJ) TRRS standard which is, from tip to sleeve: Left Audio, Right Audio, Ground, Mic. I purchased an adapter that broke out the headphone and mic connections of a TRRS plug into separate jacks. I initially used both mics into the dual mono-stereo adapter, into the mic jack on the TRRS adapter, into the headset to lightning adapter, into the phone.
it worked but that’s a lot of adapters. happy with this result and anxious to put it to use i grabbed a single mic and went off to a show i was hoping to record as a test. what i failed to realize was that my wiring for fake mono on stereo recording devices would cause problems with that adapter set up.
the jack in the TRRS adapter is expecting a tip-sleeve mic plug, which is kind of standard for crappy computer mics. my plug has the same signal on tip and sleeve from the same wire so when i plugged it into the tip-sleeve plug, which grounds on the sleeve, the mic signal on the ring shorted to ground and killed it. with the dual-stereo adapter it worked because the signal on the tip was decoupled from the ring and sleeve.
with all of that information gathered i’m going to wire a mic to work directly, with the only adapter being the lightning to TRRS. i have a couple TRRS plugs so it should be as simple as wiring the mic to the sleeve connector and nothing else. i won’t be able to monitor what i’m recording while using that setup but it will be super convenient for carrying around and grabbing random samples/recordings at unexpected times.
just waiting on my bulk cable at this point, i’ll post an update once i try it out.