Icom Multipin Plug I2
- Speaker Out.
- VCC. Power take off from radio battery via 47 ohms.
- Detect. When grounded signals radio to use external audio.
- Gnd. Common Ground.
- RXD. Receive Data.
- TXD. Transmit Data.
- Mic + Mic in. If using an Electret Mic this will need powering externally from VCC via 15K resistor.
- Ext PTT. PTT when grounded
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