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DCF77 emulator with ESP8266, Elektor LABS version (150713) | Elektor Magazine
How to build a DCF77 HID USB real-time clock (dcf77-hid-usb-rtc) for usage with Linux systems « Adafruit Industries – Makers, hackers, artists, designers and engineers!
Amateurfunkbasteln :: Elektronik :: DCF77-Empfänger und Software