SAM-III Construction Manual
See last page for document and copyright information, File: SAM-III Magnetometer Construction.doc, Page 8
Install all listed components on the top (silkscreen) side of the PCB and solder at the bottom. A larger
image of the PCB is shown in Sect. XIX.
Solder all resistors
Solder the diodes. Diodes are polarity sensitive and must be installed with the proper
orientation. The bar or stripe on one end of the diode indicates the cathode and it must
correspond with the bar on the PCB silkscreen
Solder all 100 nF ceramic capacitors (these capacitors are not polarity sensitive and may be
placed either direction)
Solder the voltage regulator U2. To avoid damaging stress, do not bend the leads on U2 at the
body; bend them about 2 mm away from the body. The leads should be bent so the TO-220 tab
can lie flat on the PCB with the holes lined up. Use 4-40 hardware (supplied) to mechanically
secure the tab; insert the screw with flat washer from the bottom of the PCB
Solder the integrated circuit voltage regulators U1, U3, U4 and U5, observing their proper
orientation. Some builders prefer to install U5 in a dual-inline (DIL) socket (see next step)
If you plan to use DIL sockets with the integrated circuits, install them now. DIL sockets are not
supplied with the kit. DO NOT install the 40-pin socket for the microprocessor U10 at this time.
Note: A 6-pin DIL socket can be made from an 8-pin or larger socket by cutting it down
Solder the two electrolytic capacitors; these capacitors are polarity sensitive and must be
installed with the proper orientation. The bar marked on the side of the capacitor indicates the
negative lead, and the longest lead is the positive. Be sure to put the long lead in the hole
marked with the + polarity
Solder the pluggable terminal blocks. The holes are very slightly oversized, so take care to align
the terminal blocks parallel to the PCB edge
