SAM-III Construction Manual
See last page for document and copyright information, File: SAM-III Magnetometer Construction.doc, Page 9
Solder the battery. The battery fits only one way. The battery terminals are VERY thin and
fragile. Be VERY careful handling the battery. DO NOT set it on a conductive surface and DO NOT
short it out. Note: The + terminal of the battery has two pins on the edge and the – terminal has
one pin. Your SAM-III Kit includes one of two battery types, with slightly different spacing
between the + and – terminals. The PCB may be equipped with one or two holes for the –
terminal. If the PCB has one hole, it may be necessary to slightly bend the battery – terminal so
that it fits the PCB. Center the battery on the silkscreen circle on the PCB
Solder the 3-position, 2-pin power header into position adjacent to diode D1. Some kits are
supplied with a latching (polarized) header. The latching header should be installed so the latch
is facing away from the PCB
FROM THIS POINT FORWARD, DO NOT SET THE PCB ON A CONDUCTIVE SURFACE – YOU MAY
SHORT OUT THE BATTERY AND DAMAGE THE PCB OR BATTERY OR BOTH
Assemble the dc power cable. Crimp (if you have the proper tool) or solder
the orange and green hookup wires to the box type socket contacts (right) for
the 3-position socket connector and inset into the 1
st
and 3
rd
position on the
connector. There is a small tab on the contacts that catches in the slot on one
side of the connector, so be sure to insert them with the correct orientation.
Solder the two wires to the coaxial dc power jack as shown in the drawing
below. Observe polarity. Note: Some PCB power connectors have a mechanical polarizing latch
and tab; see drawing on the next page for wiring. If the
connector does not have a latch, put a drop of red fingernail
polish or tape on the + side of the connector (adjacent to
orange wire) and on the PCB
Connect the finished power cable assembly to the PCB power
input header pins. Observe polarity
Double-check all components for location and check polarity
sensitive components (electrolytic capacitors, diodes, battery),
voltage regulators and integrated circuits for proper orientation.
Double-check all soldering
If you installed IC sockets, be sure that only U5 (ICL7660) is
plugged in at this time. No other ICs should be installed
