GS-1100 to iPad/iPhone Mic adaptor

[Sesselmann]

Hi All,

The iPhone headset style TTRS connector is becoming increasingly popular these days, it is used on phones, iPads and now also common on new laptop computers. I guess it makes the hardware simpler, saves space and allows the user to plug their iPhone headset into their laptop and so on.

ttrs.jpg

For us GS users it's a pain in the neck, but the solution is not very complicated. The iPhone or computer is looking for a resistance in the microphone circuit of around 1K, this tells the hardware to switch from using the internal mic to using an external mic. Without this resistor the machine will not switch.

The fourth ring from the tip of the TTRS connector is the MIC connection and the third ring is ground, but since our microphone is sending an AC signal it doesn't matter which way you solder this cable. You will soon discover that he TTRS plugs are a pain to solder because for some reason there is almost no room inside the plastic cover to accommodate the wires, therefore soldering the ground to the fourth ring is a heck of a lot simpler.

Fitting a resistor on the TTRS side is virtually impossible, but if you have a small resistor it will fit nicely across tip to ground inside the mono connector, so keep it simple !!

Below is a simple schematic showing how to wire the TTRS connector so it will work with your GS.

Now for the absolute purists I apologise in advance, because I have deliberately simplified this to a working solution, proper iPhone headsets control volume and recording functions with resistors inside the switch on the cable (680 ohm, 220 ohm and 1.4K) so if you are making a headset for an iPhone then this schematic won't work.

iPhone Jack.png

Best of luck...!