This is an Icom 13-pin accessory breakout PCB that connects directly to the accessory jack of your IC-7300 radio. It’s a very simple circuit that passes all the pinouts on the rear of the radio to a header pin that you can either plug directly into a breadboard for circuit development or jumper out to an existing interface. Every owner of an IC-7300 has at one stage needed to access something in the accessory jack of the radio at some stage. It’s ideal for getting audio into the radio too if you use a mixer.

This PCB came out of the necessity to build Arduino projects around Icom’s IC-7300 radio, in particular an antenna switching circuit that has a +5v output on various IO pins depending on the band selected on the radio. There are other breakout PCBs on the market but they are super expensive.

The board is super simple with two LEDs the indicate voltage present on the 13.8v supply line and the 8v line. These LEDs serve no other purpose than to let you know when the breakout board is connected and can be omitted if not required.

The Header pins can be soldered on the top or bottom side of the PCB depending on your use. The PCB measures 50mm x 35mm. All you need to do is supply a 13-pin to 13-pin male DIN cable or build one from readily available bits online or in-store. The 13.8v that’s available on pin 8 is switched by the radio. It can deliver 1 amp max making powering small projects a breeze.

Don’t forget, Icom supplies a 13-pin DIN pigtail with your radio.