iPhone mic breakout not quite working. - Page 1
Forum section: electronics / beginners

author: XOIIO
author_rank: Super Contributor
timestamp: November 28, 2013, 11:47:33 pm
content: Hey everyone, I made a mic breakout for my iphone so that I could hook it up to the Sure UC wireless mic system I scored, but, something odd happens. It picks up from the 3.5mil audio jack but it also records from the internal mic and with both on, the sound cuts out a bit. Without any other sound this is what it is.https://www.dropbox.com/s/g4xsada2ic39gxs/Memo.m4aI heard that iphones detect microphones based on impedance, and I know eff all about audio but since this is a high quality audio system is it possible that the impedance of the output is just too low? I guess it could also be because I'm not directly hooked to the mic but rather the audio output that maybe that is part of it. When hooked to speakers it is crystal clear though.Would some sort of pull down resistor help?

author: mathsquid
author_rank: Frequent Contributor
timestamp: November 29, 2013, 01:51:36 am
content: A few years ago I made an adapter that would let me use a 2.5mm plug headset with my iphone. Here's a picture and a rough schematic of what I did. I give no warranty on it, but I've used it for a few years with an iphone 4 and 5c and it works great.

author: XOIIO
author_rank: Super Contributor
timestamp: November 29, 2013, 01:55:28 am
content: Quote from: mathsquid on November 29, 2013, 01:51:36 amok I'll try adding those resistors (or a 120k resistor) to the circuit to see if it works. I really hope it does.

author: mathsquid
author_rank: Frequent Contributor
timestamp: November 29, 2013, 01:59:05 am
content: I used the 100K and 10K in parallel because that made the current draw pretty much equal to that of the apple headset. Together they are equivalent to about 91K ohms, so 120K might be a little too high.

author: XOIIO
author_rank: Super Contributor
timestamp: November 29, 2013, 02:00:19 am
content: Quote from: mathsquid on November 29, 2013, 01:59:05 amahh, ok

author: XOIIO
author_rank: Super Contributor
timestamp: November 29, 2013, 02:07:44 am
content: Didn't work with an 87k ohm the VU meter on my phone is still twitching and its using the intenal mic so ill try 100k and 10k together

author: XOIIO
author_rank: Super Contributor
timestamp: November 29, 2013, 02:15:21 am
content: WHOOO! You are awesome! I could kiss you, but you might be a guy lol.It works freaking perfect! Definite quality boost up close but now i can walk wherever and record! Kudos!Here is the mic system btw.

author: XOIIO
author_rank: Super Contributor
timestamp: November 29, 2013, 02:23:32 am
content: actually, I'm not sure sure if the quality is better or not. I can record at the same level from any distance but I'm not sure if it sounds better or not. What do you guys think?

author: mathsquid
author_rank: Frequent Contributor
timestamp: November 29, 2013, 02:24:33 am
content: You're quite welcome. I was stymied/frustrated for quite a while when I was trying to make this adapter, and I'm glad that you can get some use out of it.

author: XOIIO
author_rank: Super Contributor
timestamp: November 29, 2013, 02:58:40 am
content: Here is the cable.

author: ttp
author_rank: Regular Contributor
timestamp: November 29, 2013, 03:37:02 am
content: Quote from: mathsquid on November 29, 2013, 01:59:05 am100K and 10K in parallel is 9.1K (9K1), hope your 91K is just a typo. 120K || 10K gives 9K23, not much difference.

author: mathsquid
author_rank: Frequent Contributor
timestamp: November 29, 2013, 04:11:12 am
content: Yeah. I was off by a power of 10. oops.