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Working with wire-wrap on 29 April 2009
A couple of images from the discussion and work with wire-wrap at UCC.
Vero Pin
This is a Vero pin which is handy for installing axial leaded components e.g. resistors and radial leaded components e.g. monolithic decoupling capacitors. The blue prototype matrix board material is soft enough to push the shoulder on the pin right into the board (it deforms the copper pad sometimes) to mechanically retain the pin prior to soldering the pin to the copper pad on the board. Component leads can then be fitted into the retaining notch at the top of the pin and soldered in place. The part can then be wire-wrapped and also desoldered and replaced if necessary without disturbing the wraps.
Jiffy Box Hack
This is an idea that I wanted to test. The jiffy boxes are a handy way to mount a prototype board to protect the wire wrap pins but still allow access to signals above for debugging. In the past I had just discarded the jiffy box lid, installed the lid retaining self-tapping screws into corner holes on the board and left the top circuit exposed for test and measurement of the circuit. The image above shows the re-use of the jiffy box cover to protect the prototype further while still retaining side access for cables, connectors, and limited test access. The jiffy box is purchased with the self tapping screws in a bag inside the box. The screws were not installed. Instead, the screw holes were resized with a 2.5mm twist drill shown in a hand mandrel in the foreground. This is the drilling size for an M3 tapered tap (also shown) and the tap and mandrel were used to tap the holes to accept the threaded standoffs like the example in the left foreground. The final prototype pictured has the board now retained with four threaded standoffs and the jiffy cover is retained on those with four M3 by 6mm phillips head metal thread screws.
Materials and Suppliers
Some project prototyping resources (mainly wire wrap)
Soanar Plus mail orders use the Jaycar stock numbers but their mail order prices are cheaper
Jiffy Boxes
http://members.iinet.net.au/~worcom/browse_catalog.php?sort_by_cat=Boxes\Enclosures
Only one size from Jaycar
http://www.jaycar.com.au/productView.asp?ID=HB6004&CATID=5&form=CAT&SUBCATID=343
or Soanar Plus
Prototyping Boards
http://au.farnell.com/jsp/search/browse.jsp?N=500001+1000344&Ntk=gensearch_001&Ntt=ROADRUNNER&Ntx=
About the lowest cost for board area
http://au.farnell.com/roadrunner/rrb-006/pcb-oktopad-sngle-sided-233-4x160/dp/8498709
Wire-Wrap Sockets
http://members.iinet.net.au/~worcom/browse_catalog.php?sort_by_cat=IC+Sockets
Nice picture for price comparison
Wire-Wrap Wire
50 metre rolls are cheaper at RSComponents
http://australia.rs-online.com/web/search/searchBrowseAction.html?method=getProduct&R=2094805
Purchase by the metre (see P/N WWBL)
http://members.iinet.net.au/~worcom/browse_catalog.php?sort_by_cat=Cables+Misc
Or from Soanar Plus (enter "wire wrap" at Search Products)
Wire-Wrap Tool from OK International
http://au.farnell.com/ok-industries/wsu-2224/tools-pencil-wire-wrap/dp/1046720?in_merch=New Products&MER=i-e1a0-00001002
Vero Wire-Wrap Pins
For leaded resistors, decoupling capacitors etc
http://au.farnell.com/vero/18-0226/terminal-pin-ww-pcb-pk500/dp/1209344
Threaded Spacers
http://members.iinet.net.au/~worcom/browse_catalog.php?sort_by_cat=Spacers+Threaded
Pan Head Screw 3mm X 6mm Philips (M3X06PAN)
http://members.iinet.net.au/~worcom/browse_catalog.php?sort_by_cat=Small+Screws%2FNuts
Single-In-Line Machine-Pin Header (D01-9923201)
http://members.iinet.net.au/~worcom/browse_catalog.php?sort_by_cat=Connectors
Nice picture for price comparison
http://au.farnell.com/harwin/d01-9923246/header-1row-32way/dp/1022218
Prototyping SMD Daughter Boards
from Bellin Dynamic Systems Inc.
available in Australia from Electus
http://www.electusdistribution.com.au/productResults.asp?form=KEYWORD&keywords=Bellin
RS Components has quite a range but generally higher cost