Have you built your own CI-V interface? Share your mods or troubleshooting tips below!

The Icom CT-17 is a handy level converter that allows your computer (via RS-232 serial) to talk to Icom radios using their proprietary CI-V (Communication Interface-V) bus. But if you’ve searched for an “Icom CT-17 schematic,” you know Icom doesn’t publish it. Don’t worry—reverse engineering and community knowledge have made the circuit well understood. Let’s break it down.

Here’s a useful blog-style post tailored for someone searching for the . It balances practical advice, a bit of theory, and where to find or recreate the circuit. Title: DIY Icom CT-17 Schematic: Build Your Own CI-V Level Converter

PC RS-232 MAX232 CI-V (TTL) --------- ------- ---------- TXD (pin 3) ----> R1IN (13) -> R1OUT (12) ---[4.7k]--- Base of NPN | GND Collector of NPN ----[1N4148]----> CI-V Data (to radio) | GND RXD (pin 2) <---- T1OUT (14) <- T1IN (11) <---- CI-V Data (from radio) Note: Actual circuit includes a pull-up on CI-V line to +5V via 4.7kΩ, and transistor inverts the signal twice.

8 Comments

  1. Icom Ct-17 Schematic -

    Have you built your own CI-V interface? Share your mods or troubleshooting tips below!

    The Icom CT-17 is a handy level converter that allows your computer (via RS-232 serial) to talk to Icom radios using their proprietary CI-V (Communication Interface-V) bus. But if you’ve searched for an “Icom CT-17 schematic,” you know Icom doesn’t publish it. Don’t worry—reverse engineering and community knowledge have made the circuit well understood. Let’s break it down. icom ct-17 schematic

    Here’s a useful blog-style post tailored for someone searching for the . It balances practical advice, a bit of theory, and where to find or recreate the circuit. Title: DIY Icom CT-17 Schematic: Build Your Own CI-V Level Converter Have you built your own CI-V interface

    PC RS-232 MAX232 CI-V (TTL) --------- ------- ---------- TXD (pin 3) ----> R1IN (13) -> R1OUT (12) ---[4.7k]--- Base of NPN | GND Collector of NPN ----[1N4148]----> CI-V Data (to radio) | GND RXD (pin 2) <---- T1OUT (14) <- T1IN (11) <---- CI-V Data (from radio) Note: Actual circuit includes a pull-up on CI-V line to +5V via 4.7kΩ, and transistor inverts the signal twice. But if you’ve searched for an “Icom CT-17

  2. For 551-553, you need Rowan to be corrupted, Alexia to have learned magic with Cliohna and not have influence toward Andras and Jezeras. Her corruption level is not important. The scene trigger when you visit the Catacomb
    For 483, I think this is a bug because this cg is part of an animation with 484. Seems that the game unlock only 484

    • i know that 483 should be unlocked along with the 484 but at least on latest steam build was bugged and didn’t triggered, haven’t got the chance to try on the current build
      as for 551-553 i was able to repro them as well yesterday( I was able to get it with both corrupt Rowan and Alexia, and no magic learned, will have to try few more times to see if any of them are required) this scene was bugged on previous steam build but it’s obtainable now, but will edit after I manage to repo all the new CGs
      and will have to take a look for the X’Zaratl CGs as some of the requirements have been changed

  3. good work on this. Seems I havnt missed hardly anything, If I count some of my older play throughs. The few i did miss would require choosing things I simply wouldnt choose while playing lol (like siding with Werden) maybe sometime when Im bored just to unlock them. Thanks for helping me figure out Ive managed to nail just about everything available atm.

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