5. Electronics production

Group assignment

  • characterize the design rules for your PCB production process

The members of the group: * Achille Achille’s site * Anssi Anssi’s site * Jari Jari’s site * Hannu

Individual assignment

make an in-circuit programmer by milling and stuffing the PCB, test it, then optionally try other PCB processes

Research

Group assignment

The principle of electronic circuit by shortly

An electronic circuit consists of different electronic components such as
resistors, diodes, ICs (integrated circuit) etc. Electronic components connected by conductive wires or traces through which electric current can flow.

Traces role is to combine individual pieces of electronic components together into a single electronic circuit on a printed circuit board (PCB).

A printed circuit board (PCB)

PCB consist of non-conductive base material layer and conductive layer or layers. These different layers are laminated together. Usually base material is fiberglass and conductive layers are copper.

To make connections between different components on PCB it is necessary to remove part of copper layer. These connections on copper layer is called traces.

There are many different PCB manufacturing techniques. In Fab Lab Oulu we use milling to make traces on PCB.

PCB manufacturing

In Fab Lab Oulu main milling machine is Roland SRM 20 (see picture 1).

Roland SRM 20

The file we used was given by our local instructor. And then, we went to http://mods.cba.mit.edu/ and right click>programs>server>SM20>PCB png then go to view and set different design characteristics for the milling machine As shown in the pictures.

First, we created a new block called “save file” and connected it with the “Roland SRM-20 milling machine” by right click>modules>open server module>file>save after creating the module I connected the output of the previous module to the current save file module block.

Next, for the line test design, we selected “mill traces” in PCB defaults module and then in the miller Raster 2D module we set the tool diameter to 0.2 mm.

Linetest1

Mods

Linetest2

Individual assignments

  • make an in-circuit programmer by milling and stuffing the PCB,
  • test in-circuit programmer, then optionally try other PCB processes

PCB

PCB

PCB

Milling and stuffing