The NC600 Nixie Desk Clock from Cathode Corner

The clock is housed in a sturdy Plexiglas cabinet. It uses
NOS ZM1010 Nixie tubes with 0.5" tall digits (supplied).
This clock board is also available without a cabinet.

Setting the time is simple. The red button selects which
digit is being set, and the black button advances that digit.

The digits are multiplexed, which results in a very simple circuit.
There are only 2 ICs (68HC705 CPU and 74141 cathode driver) and
a dozen transistors in the clock.

The power supply is a switching type, capable of running
on 100-240VAC 50-60Hz, so it works in Europe and North America.
No changes are needed to convert from 120V 60Hz to 240V 50Hz.

The timekeeping is done by a crystal with a trimmer to allow fine
adjustment. A jumper allows selection of 12-hour or 24-hour time.
The leading zero is blanked in 12-hour mode, but not in 24-hour mode.
There is no date or alarm function.

Nixie tube life is estimated at 5 years in this clock.


Dimensions: 6" wide x 3" tall x 3.5" deep.

AC Power: 90-250VAC 50-60 Hz, 2 Watts

Schematic Diagrams

The NC600 revision A and B schematic is here.

The NC600 revision C schematic is here.

The NC600 is all gone. Sorry.

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Last updated 4/3/2005