Schematic DIY KitClock Circuits Exact time of the PTB in Braunschweig
The Physikalisch-Technische Bundesanstalt operates in the vicinity of a Branschweig station, broadcasting at 77.5 kHz, a highly accurate time signal. Here links to interesting circuit for this signal

Here you will find Schematic Circuit Diagram for DIY and further information on Clock Circuits
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Nixie Clock with DCF77 control
DCF77 receiver connected to serial interface

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