EEZ H24005 Building Instructions

EEZ PSU H24005 Building Instructions (r5B9)
Work in progress – please note that some of issues discussed below is fixed in r5B10 and newer revi-
sions
• PCB assembly
•
Enclosure and wire harness
• Firmware uploading
Fig. 1: Stacked assembled EEZ PSU H24005 in acryl and metal enclosures
1. PCB assembly
The PSU has four PCBs where
specialized parts (e.g. power resistor, PCB mounted AC/DC adapter, post-regulator's power mosfet,
etc.) are THT.
SMT parts are selected to be easily mounted with hand soldering and assistance of magnifying glass
with light or low magnification microscope. In general, a magnification of x8 to x10 should be more then
appropriate for this task. Almost all passive components are of 0805 size and never smaller then 0603.
Selected IC packages are SOIC, TSOP, TSSOP and similar that have exposed pins (i.e. no
BGA package are selected).
Only two ICs (IC1, IC16) that has exposed power tab cannot be simply mounted with soldering iron and
need hot air soldering station. That requires different skills but one can find many useful videos on the
Internet with instructions how to do that efficiently at home without use of e.g. stencil and
1.1. Required tools
• Soldering iron with conical sloped tip
•
Hot air soldering station
• Solder wire 0.25 mm example, and 0.7 mm
SMT parts are used to the greatest extent. Only connectors and few
example
example
example
1
(optionally solder paste, for ICs with
QFN or
reflow owen.