Real Time Clock modification
for 2D3 nixie clock
The original 2D3 PCB did not include a real time clock chip and has to
be modified to include one. The DS1307 RTC replaces IC3, the EEPROM in
the lower right corner of the main board.
To fit the battery holder some cuts need to be made in the foil on the
top surface of the board, and some of the solder mask needs to be
removed.
1:
Isolate a 10mm x 10 mm square of foil. I found that a round or
triangular needle file is good for this. Hold the board up to the light
to check that the foil is cut all the way round. Scrape the solder mask
off in the three areas shown to reveal the copper foil and tin with
your soldering iron. Check that the isolated square of foil really is
isolated using a multimeter.
2:
Solder the battery holder.
3:
Bend pins 1,2 and 3 of the DS1307 RTC chip as shown. Insert the
remaining five pins into the board and solder. Crop the pins as shown.
4:
Crop the crystal wires to about 8mm and solder to pins 1 and 2.
5:
Bend the crystal over the top of the chip. Connect pin 3 to the battery
holder with Keynar wire. Don't fit the battery until you have completed
the rest of the clock.
Back to the schematic page.