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Microphone Adapter “Line In” Schematics

Posted by Jonathan on August 29, 2009 in Microphone Adapter |

As I promised in my earlier post here are the schematics for my ‘Line In’ microphone adapter.

Below I show you how I got my Sennheiser EW100 bodypacks to work with my iPhone. I’ve used this and it works for me. I made this schematic after my observations with how the Standard iPhone headset behaves when it was plugged in using the test rig I showed in my ealier Post.  The resistor is used to drop the voltage on the Mic line as to tell the iPhone there is a external Mic attached. The capacitor is used to protect the Sennheiser Bodypack from the DC current emited by the iPhone.

Here is my massive Line In Microphone box that allows you to switch from a ‘Pass Through’ to a regular ‘Mic to Tip’ and then a ‘Mic to tip’ that allows the Sennheiser bodypack to work.

Massive Switch Box

Link to a PDF of this schematic

Parts list is below:

S1 – This is a 4PDT Switch that I bought from Mouser Part Number 633-M204201D

S2- This is a DPDT Rocker Switch I got from Radio Shack.

S3- This is a DPST switch I made from a DPDT switch. It is just used to keep the resistor and the Capacitor from feeding back into anything else.

R1- This is a 4.7K Ohm Resistor I got at Radio Shack.

C1- This is a 10 uF Capacitor. You can get one at radioshack or Mouser 140-NPAL50V10-RC

You can get the 4 Pin male Headphone plug at Mouser 171-7435-EX

You can get the 4 Pin Female plug also at Mouser. I used a 161-5435-EX, but 161-7900-EX would be easier to use as you wouldn’t have to put the plug through the case and THEN solder the wires like I had to.

Here is a ‘Mic to Tip’ that allows the Sennheiser bodypack to work only.

Microphone Line in Cable

Link to a PDF of this schematic

Parts List Below:

R1- This is a 4.7K Ohm Resistor I got at Radio Shack.

C1- This is a 10 uF Capacitor. You can get one at radioshack or Mouser 140-NPAL50V10-RC

You can get the 4 Pin male Headphone plug at Mouser 171-7435-EX

You can pick up the 3 Pin Headphone at Radio Shack or Mouser. 16PJ106-EX

Credit goes to Jesse from Bent-Tronics.com with regards to the capacitor idea. I came across his post when I first ran into frustrations with getting the Sennheiser body packs to work.

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