📄 elm - wiring techniques.mht
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Subject: ELM - Wiring Techniques
Date: Tue, 28 Dec 2004 00:06:03 +0800
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<H1>Progressive Wiring Techniques</H1>
<P class=3Dhdd><BR>July 14, 1997</P>
<HR class=3Dhds>
<DIV class=3Dabst><IMG class=3Drset height=3D323=20
src=3D"http://elm-chan.org/docs/wire/wiring_5.jpeg" width=3D363>=20
<P>To build any electronics handicrafts, there are some wiring =
materials. I=20
think most people are wiring circuit board with PTFE (Teflon) insurated =
wire.=20
But the PTFE wire is not suitable for wiring material with solder due to =
following reasons.</P>
<UL>
<LI>Wires on the circuit board gets like a dish of pasta when wired =
many=20
number of wires because its insulator is tick.=20
<LI>And changing a part of the circuit will be difficult.=20
<LI>Working efficiency is not good, each wire must be stripped to be =
solderd.=20
</LI></UL>
<P>So I recommend to use UEW for protoboard. The UEW is polyurethane =
coated=20
copper wire which is used to inductors and small transformers. This =
wiring=20
method is minor way, yet. However, it has cleard that problems, so that =
it is=20
better way for wiring on the protoboard.</P><BR>
<P>To wire with UEW, a wiring tool called "wiring pen" is used. The =
wiring pen=20
is often sold with PCB kits, however, they are not useful because its =
tip is=20
dull. When you did not satisfy bought wiring pen, it will be better to =
build it=20
yourself. I built the wiring pen from a drawing pen.</P><BR>
<P>According to some trial, 0.2 mm dia (32AWG) of UEW is the best for =
wiring the=20
PCB. This is equivalent to 0.9 mm print pattern. Its insuration is =
sufficient=20
for low voltage circuits such as a logic board below 20 =
volts.</P></DIV><BR>
<DIV class=3Dpara><IMG class=3Drset height=3D240=20
src=3D"http://elm-chan.org/docs/wire/wiring_2.jpeg" width=3D311>=20
<P>It is very easy to wire in high density layout, even if parts are =
mounted on=20
the board without free space.</P><BR><IMG class=3Dlset height=3D149=20
src=3D"http://elm-chan.org/docs/wire/wiring_1.jpeg" width=3D400>=20
<P>Left image shows the solder surface. It is very smart because the =
insuration=20
coat of the UEW is very thin. It will get like pasta if wire same =
circuit with=20
PTFE wires :-)</P><BR><IMG class=3Drset height=3D121=20
src=3D"http://elm-chan.org/docs/wire/wiring_3.jpeg" width=3D293>=20
<P>This is a wiring pen that I built, wind a UEW to a bobbin and set it =
tail of=20
the wiring pen, and wire in like drawing a line.</P></DIV>
<DIV class=3Dpara>
<H3>But Recently...</H3><IMG class=3Drset height=3D250=20
src=3D"http://elm-chan.org/docs/wire/wiring_4.jpeg" width=3D300>=20
<P>In early time, I had wired in avobe method that wire in wind-and-lead =
like=20
daisy chain. However, it is not suitable for wiring random logic, analog =
circuit=20
and surface mounted devices. To wire in point-to-point like wiring with =
PTFE=20
wire is better for them. Now I am working in this method. The =
polyurethane coat=20
at end of wire is weak in heat so that pre-soldering to the UEW without =
any=20
stripping process is also easy. 350=B0C of tip temperture is recommended =
for=20
UEW.</P>
<P>I am using only through holed protoboard, cut leads at solder surface =
to zero=20
height, this can wire smoothly and can prevent to damage polyurethane =
coat by=20
leads edge.</P></DIV>
<DIV class=3Dpara>
<H3>How to mount SMD</H3>
<P>To mount SOP or QFP devices, most will use pitch conversion boards. =
However=20
the conversion board is expensive and require mounting area, it is not =
smart=20
method. Thus I am mounting that devices on the protoboard directly.</P>
<P>To mount the SMDs without pitch conversion board, put a polyimide =
(Kapton)=20
tape on the board to insurate, bond the deivce on the tape and wire each =
lead.=20
The polyimide is heat resistant material which is used for high =
temperture=20
insurator, film cable and PCB. It can work up to 200=B0C continuous and =
resist=20
soldering temperture. To solder wire and lead, pre-solder wire and lead, =
press=20
wire to the lead with soldering iron, will easy. [<A=20
href=3D"http://elm-chan.org/docs/wire/wcd.jpeg">Example</A>]</P></DIV>
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