Nixie Clock ‘SN18’
www.pvelectronics.co.uk
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4.13 PM LED (D7/PM on schematic, ‘PM’ on PCB)
This LED is optional, and if you will only be using the clock in 24
hour mode, is not really necessary. When lit, it indicates ‘PM’.
Please note that it indicates PM for the time of the clock only, not
AM/PM during alarm set and time set modes. Alarm and time set
modes are always in 24 hour, or ‘Military’ time. If you choose not
to use it, it may be used as a seconds indicator for D5 if you will
not be using the WWVB or DCF syncronisation feature.
If you are installing D7, proceed as follows. Select the orange LED,
and find the longer lead. Insert into the hole . Install at a
height suitable for the case you will be using. You can use small
pieces of the clear insulation provided if you wish. Finally, you may
like to bend over the top of the LED a little as shown in figure 19,
to point in the viewing direction.
Figure 18: 11 Socket
receptacles placed for
mounting the IN-8 tube
Figure 19: PM LED bent
over slightly in viewing
direction
