Copyright 2004, 2005, 2007 Sphere Research Corporation Nixie Clock Kit Instructions Page 16
10.
Insert and solder the transistors Q1 and Q2 (MPSA42/44 high voltage colon drivers), watch for the correct
orientation, the board shows the case outline, they are at the front of the board in the combined version.
Install a 2N2222A or PN2222 at Q101, note the early board art shows the flat on the wring side, install as
shown below, this part will be correctly pre-installed on initial boards. The emitter goes to the outside
track.
11.
Install U9, the +5V Voltage Regulator, typically an LM340T5, or 7805T, etc. attach the flange to the board
with a screw and nut, and solder the 3 leads to the board. Double check the large polarized capacitor
orientations in the power supply against the picture below, and note that C13 and C18 are optional, and
not normally required:
12.
Install and solder the DC power jack at location J2, unless you have a different way of connecting power
in your system. The wall wart plugs directly to the jack, a clearance hole at the rear of the case (without
touching the jack in any way) is required. Note R18 above, it is a 10 Ohm, 2W flameproof part, or other
larger parts could be used if the supply voltage is higher than normal.
Summary of Contents for U6DNC Series
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