Vermes
Advanced Member level 4
The system of the clock was based on microcontroller '51 AT89C51. Source code consists of few hundreds lines of code in Assembler. Lamps are multiplex controlled with a frequency of 1KHz. Decoder BCD/1 of 10 type 74141 and high voltage transistors control the lamps. Displays are powered from a converter on NE555. DCF receiver was made based on U4221B. Functions can be selected by a switch.
Functions:
- alarm
- manually set time
- synchronization DCF 77
- display time UTC
Link to original thread (useful attachment) – Kolejny zegar Nixie z DCF i budzikiem.