We’ve reached the grand finale of the TOADs Digital Interface build series! 🎉 In this episode, I walk you through building the Carrier Operated Squelch (COS) circuit — the secret sauce that makes the entire interface come alive.
This project transforms any old radio into a modern digital modes machine with just a simple USB connection. Whether you’re into FT8, JS8Call, PSK31, or any other digital mode, this build will give you the tools to get on the air.
👉 If you missed the earlier videos in the series, check them out here:
• Part 1 – PTT Circuit https://youtu.be/wgZmwwxZj4g
• Part 2 – Audio In Circuit https://youtu.be/N8jtsNKiXco
• Part 3 – Audio Out Circuit https://youtu.be/p5NyT2plENE
• Part 4 – (this video) COS Circuit https://youtu.be/dQeY9Dy-rWk
👉 TOADs DI board: https://www.temporarilyoffline.com
👉 TOADs DB6 Board: https://www.temporarilyoffline.com
👉 Documentation: https://geni.us/toads-di
👉 VK/ZL Orders: https://hamradiodx.net
👉 UK/EU Orders: https://shop.m0jsx.radio/
👉 Treedix RJ-45 Breakout Board: https://geni.us/rjCLNC
👉 10k Ohm Resistor: https://geni.us/JOHso
👉 BC547 Transistor: https://geni.us/SALAj
👉 Breadboard: https://geni.us/ruOylg
👉 Dupont Wires: https://geni.us/Hs41kGJ
👉 PCB Prototype Boards: https://geni.us/6ovrxgI
👉 Standard Double Row Pin Headers: https://geni.us/R7Ecka
Works with ANY radio and YOUR imagination!
👉 Winlink
👉 Allstar
👉 APRS
👉 FT8
👉 JS8Call
👉 Packet Radio
📡 What you’ll learn in this video:
• How the COS circuit works and why it’s essential
• Step-by-step circuit build explained
• How to integrate it with your radio & computer
• Why this design makes TOADs Digital Interface unique
🔔 Don’t forget to like, subscribe, and hit the bell so you don’t miss upcoming ham radio projects and experiments!
#HamRadio #DIY #DigitalModes #AmateurRadio #RadioDIY #TOADsInterface
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