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VLF-3 Rev #1C Assembly Instructions
6
(Check off boxes as each step is completed)
1. SOLDER COMPONENTS TO Printed Circuit Board (PCB)
These instructions refer to assembling the INSPIRE VLF3 receiver kit with the PCB
marked on the edge as “NASA VLF-3 REV #1C”. A few things need to be noted before
you begin assembly.
1) The transistor (Q1) and the field effect transistor (J-FET with ferrite bead) have
been preinstalled.
2) Capacitor C20 has a place for it screen printed on the PCB,
but it is not to be
populated
, even if you end up with an extra 0.1 uF capacitor in the parts
provided. Leave that location on the PCB empty.
3) Capacitor C12 needs additional attention for it to be installed correctly. A PCB
trace is missing from the side of C12 nearest R20, which should have connected
this end to ground. To fix that you will need to scrap of a small part of the green
coating on the trace that runs directly under C12 and connect this lead to that
ground trace when you install C12. Check out the pictures below. The first is
centered on the location with an arrow pointing to the lead in question. The
second shows some of the insulating green coating removed, and the third
shows how the lead from C12 can be bent over for soldering to the ground trace.
It is a simple fix if you are patient and careful.
4) Variable resisters (potentiometers) R7 and R26 are installed on the non-
component side of the PCB after the other small components are installed. Note
that there is a small tab that may protrude from the potentiometer body that will
need to be removed if present. The picture below shows one of them with the
tab noted. To remove the tab, grab is with pliers and bend back and forth at the
base until it breaks away at the base.
Содержание VLF-3
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