Nixie Tube Clock ‘Frank 2 IN-16’
www.pvelectronics.co.uk
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4.9
Power Connector CONN1
Place the power connector in position (figure 13), and solder in
place. Try not to use too much solder which could flood through
and cause shorts. Just lightly solder each tab to one side of it’s hole
(figure 14).
Figure 13: CONN1
Figure 14: Underside view of CONN1
4.10
Testing the Switched mode (170V) and regulated (5V)
power supplies.
If you have reached this point and followed the correct order, then
all the components for the 170V and 5V power supplies should now
be on the board, and it is recommended that at this point the
power supplies are tested before proceeding. To do so, you will
need to have the 9-12V AC power adapter to hand. Also at this
stage you will need a small flat blade screwdriver and a
multimeter.
DANGER: At this point, observe the safety warnings in section 1.3.
When powered up, the board will generate up to 300V DC, and live
parts are exposed. Observe high-voltage precautions.
4.10.1
Testing the power supplies
First, check that the 5V supply is in order. Use the GND, 5V and
170V test points to test first the 5V supply, then the 170V
supply. Adjust the position of VR1 until the voltage is 170V. Be
sure to set your multimeter to DC setting.
When all is in order, disconnect the power supply. Take care, as
the output capacitor can still hold charge at 170V after the
supply is disconnected.
4.11
Socket for IC3, IC4.
Insert the 18 Way IC socket into the PCB, ensuring that the notch
at one end is aligned with the corresponding mark on the PCB.
