PDA connectors and cables Audio
4 pin 3.5mm (2.5mm) plug connector at the headset cable
|2||Audio channel||left or right|
|3||Audio channel||left or right|
- Ring 1 has a 1.4K ohm loading to Ground. When talk/play/pause function button is pushed it applies a short across ring 1 and 4. With ring 1 disconnected the Pearl plays via its internal speaker. However with 1 and 4 shorted it continues to play from its internal speaker!