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Koppar releases USB-C LTE modem for computer phone line

Creator explains motivation and technical architecture

2 Oct 31 11:58 AM · 11d ago · 1 comment · 1 source · development 2 of 6

The developer clarifies the design goals: enabling real phone line functionality on a computer (calls and texts on a physical SIM), with call audio handled through a USB sound card implemented by an RP2040 microcontroller. The RP2040 bridges the modem's 1.8V PCM audio through a level shifter to handle audio in and out over USB.

Creator explains motivation and technical architecture
github.com

“I wanted a real phone line on my computer: calls and texts on a physical SIM, answered through my headset at my desk, or by a script or an AI agent when I'm away.”

abijahkaj

abijahkaj Hardware designer / project creatorKoppar AI Design-to-manufacturing service

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