homerj

Sorry only just seen this. I did buy all the bits needed but haven't had time to make the loom yet.

Hah, that explains why I can't find a part number for it. I reckon it's the same 3b0035711B used in millions of the other VAG range but for some odd reason they've put it in there permanently. Thanks a lot for the info 🙂

Cheers mate - so I was being a muppet . Wouldn't happen to have the part number of the mic by any chance?

FYI my knowledge on electricity and electronics isn't the best. I only ever learn enough to accomplish what I'm trying to do I've mostly just been reading any articles or useful forum posts I found via Google about electret mics as well as YT vids. Ended up watching a small series of vids by the former head of design of Rode mics which helped. As well as people actually wiring them with real stuff which helped a lot. My initial confusion was... if using the "+" wire to send +5v to power the mic then where the hell does the voice signal come down from? I'd expect to see 3 pins and indeed 3 pin electret mics do exist but most seem to be 2 including the VW one made by Paragon so wtf.. I then perhaps figured the voltage feed would need to go on one side of the mic and then the other side would be the signal but nope, and that would involve having to open the casing which @xact64 doesn't mention.. And the answer is these amazing little things do indeed receive voltage and provide voice signal on the same "+" wire. (This is *not* the same as "phantom power" that you may read about for other types of mics.) So all them gubbins you see in the diagram (the 12v to 5v DC converter, 2k2 resistor, 10uf capacitor and optional 10k resistor bridging "+" and "-") are in fact wired inline! Between the mics 2 wires and where they eventually plug into your headunit - you just splice em in. At some point any units using this mic *must* be doing the same thing - just internally on their circuit boards rather than on the outside. I'd love to see the circuit board of one of these units to confirm what voltage/caps/resistors VAG use. Maybe they differ them slightly to match different cabin sizes or mic placements. Be also interesting to get a datasheet off Paragon for the mic itself and see if they suggest any particular topology. There's other bits I've learned about this but can't imagine anyone's much interested

That's where I thought it would be but ive had a look at used parts on eBay and I can't see it in there. Only 3 alarm sensors? I also can't see it on a parts diagram for the map light console, unless I'm being a muppet

Ok after reading some more all the wiring makes sense now, looking forward to wiring mine up and seeing how it compares. @xact64 how did the mic sound quality compare to the one that comes with the unit?

Anyone know where the microphone for hands free comms is located? And does anyone have a wiring diagram? Thanks

Alright after spending the last few days learning about electret microphones I now understand the wiring diagram except... What is that 10k resistor bridging + to - all about?

Ditto, how are you @xact64 applying the 5v to the output line *before* the capacitor? Are you saying your mic is a 3 wire mic? Or did you hack the original plastic housing open to run the third (5v) cable? Able to confirm part number at all? The one I commonly see is 3B0035711B which applies to a metric ****-tonne of VAG cars from 1999 to present (2024) including all Tiguans I believe - but this is a 2-wire mic? So how would this get it's 5v prior to the capacitor via the stock setups? I'm guessing this part number matches yours @evlo ? Thanks for any help!