Icom Ci V Usb Interface Schematic Top Jun 2026

Combine the separate TX and RX lines into a single, bi-directional 3.5mm mono line without causing data collisions. The Core Schematic Components

This circuit uses a dedicated USB-to-UART bridge IC, followed by optocouplers to completely isolate the computer's electrical ground from the radio's ground. Component List icom ci v usb interface schematic top

To tie the split TX and RX signals back into a single bi-directional wire without causing a hardware conflict, a simple diode-steering or open-collector array is used at the jack stage. Because the optocouplers behave like open collectors, they naturally form a wired-AND configuration on the 3.5mm tip. The radio’s internal pull-up resistor acts as the load for the entire bus. Construction and Configuration Tips PCB Layout Considerations Combine the separate TX and RX lines into

Many homebrew designs, including those discussed here, are functionally clones of the CT-17's logic, adapted for USB. Because the optocouplers behave like open collectors, they

This is the most reliable, cleanest, and most popular design for modern ham shacks. It utilizes a dedicated USB-to-TTL breakout board (such as an FTDI FT232RL, CP2102, or CH340G) and a single switching diode to combine the lines. The Schematic Circuit: