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Nixie Clock IN-17 Assembly Instructions And User's Manual page 16

Tube clock kit

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2.4.1. The small-value ceramic capacitor (C2) may be installed in either orientation, but the larger-
value cylindrical capacitor (C7) must be installed with the proper polarity. The polarity is indicated on
the PCB by a "+" sign near one end of the capacitor location. The polarity is indicated on the body of
the capacitor with a stripe with a minus (-) sign located on the negative side of the capacitor. In
addition, the shorter lead is the negative lead.
2.4.2. Either lead of the fuse may be inserted in either hole its location.
2.4.3. Turn the board over while holding the relevant component in position and bend the leads
slightly outward to hold the component in place. Solder the leads to the contact and trim the excess
lead wire above the solder joint.
NOTES:
 To make sure that capacitor C7 and diode D1 polarity is not mistaken.
 To make sure that integrated circuit U1 (LM7805) is not mistaken with transistor Q2
(IRF840) and diode D1 (1N4004) is not mistaken with diode D3 (UF4004) because they look
like similar.
16

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