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Curious? Join us on the Discord: https://discord.gg/EFJKUBrspx In this episode we cover the hardware of the TA-1042, a digital non-secure voice terminal (DNVT) used by the military in the 90s-00s. We then explain how we can use modern components to create compatible switching equipment, with a bit of EE fun along the way! To buy this crazy contraption: https://www.tindie.com/products/nickandre/digital-military-telephone-switch-rp2040-dnvt/ Episodes in this series: - part 1: project overview https://youtu.be/K60m6ZJtfkc - part 2: hardware reverse engineering (you are here) - (upcoming) part 3: programming real time firmware with the Raspberry Pi Pico - (upcoming) part 4: USB programming and interfacing these with SIP - (upcoming) Bonus video: the DNVT fax machine From the extras channel @NicksKnacksExtras - Video user guide: https://www.youtube.com/watch?v=boGw5UdfVxg&t=2s - Soldering/assembly tutorial: https://www.youtube.com/watch?v=elr1z5OFgr4 More details: The TA-1042 is a quite slick looking military phone that uses the CVSD audio codec and a proprietary switching protocol. The project implements a hat for the Raspberry Pi Pico (RP2040) cortex M0+ microcontroller that leveraged the Programmable I/O (PIO subsystem) to encode/decode data from differential Manchester encoding provided by the phone. The entire project is open source! For the full details see the product page: https://nicksknacks.net/dnvt-switch/ If you want to support our channel and get some fun perks, we are now offering memberships: https://www.youtube.com/channel/UCwXyxY8BD_xV3-tOTv-LDww/join And no, there's nothing surprising about the circuits. Sorry XD