This is the connector schema for the pre-F4 interphone made by several manufactures, by example Blueant, Cell Line, interphone.
All they have keyhole form.
Pin Number |
Pin Name |
Description |
1 | Chg+ | Charger +5V |
2 | Spk+ | Speaker + |
3 | NC | Not Connected |
4 | Spk- | Speaker - |
5 | Mic-/Chg- | Microphone - and Charger - |
6 | Mic+ | Microphone + |
The speaker is a 8 Ohms 3 Wats. the microphone is a little condenser microphone with a 0.1 pico farads and a diode soldered between the + and - terminals.