Need prototyping tips please!

Discussion in 'General Electronics Chat' started by jut, Apr 28, 2008.

  1. jut

    Thread Starter Senior Member

    Aug 25, 2007
    224
    2
    Hello. I want to start making my projects on wire-wrap PC board. Can someone please give me a general list of all things I need to get started? I can't seem to find a website that talks about getting started in wire wrap prototyping.
     
  2. Caveman

    Active Member

    Apr 15, 2008
    471
    0
    There really are just a couple of basics.
    1. You need the perf-board to put the parts on.
    2. You need the wire to wirewrap. Generally you can find 30AWG wirewrap wire. Get at least 3 colors, preferably red, black, plus one other (I like green).
    3. You will need a wirewrap tool.
    4. You will need a wire stripper. Some wirewrap tools have these built in.

    Enjoy
     
  3. techroomt

    Senior Member

    May 19, 2004
    198
    1
    what caveman said, and, although you can unwrap by hand, an unwrap tool helps a bunch. depending on how much power your running, you may want some 26 ga wire.
     
  4. beenthere

    Retired Moderator

    Apr 20, 2004
    15,815
    282
    There are handy wire wrap socket labels. I think Mouser carries them. They are a friction fit over two pins, so they hold the sockets in place. And they have the pins numbered from the back side so you get the correct pins connected.

    A small crochet hook or a spring hook is handy to fish wires out of runs.

    You can unwrap by hand, but wrapping consistently is a job for a powered tool. Do the first by hand and then consider spending the money. Same for precut and prestripped wire.

    The price is high, but you can't work with anything but tefzel insulated wire. Ordinaly insulation is too thich/too soft. The silver coating on the wire wrap wire makes the connection last.

    Work off a schematic. Make a list of each connection to be wrapped. Something like U8 - 12 -> U22 - 5 works for me. That is the chip labeled U8's pin 12 attaches to U22's pin 5. Check the connections off as they get made. Overkill for a counter, driver and display, but necessary when you have 10 -12 logic ic's to wire.

    If this is a prototype for production, record every change, both on the wrap list and on the schematic if that was in error.
     
  5. Caveman

    Active Member

    Apr 15, 2008
    471
    0
    I have to say that I prefer molten metal construction (ie. solder)
     
  6. relicmarks

    Active Member

    Oct 13, 2006
    355
    0
    is there any pictues of a prototype boards with components with wire wraping to see what it looks like please?
     
  7. hgmjr

    Moderator

    Jan 28, 2005
    9,030
    214
    Have a look at this.

    hgmjr
     
  8. jut

    Thread Starter Senior Member

    Aug 25, 2007
    224
    2
    How do you go about installing resistors, caps, transistors and the like? I understand that wire-wrapping is meant for square terminals.
     
  9. thingmaker3

    Retired Moderator

    May 16, 2005
    5,072
    6
    Wire wrapping works just fine and dandy on round terminals, resistor leads, and such. At least it did in 1988.
     
  10. Wendy

    Moderator

    Mar 24, 2008
    20,766
    2,536
    Wire Wrap was abandoned as a technique for production boards because they tend to fail over time as oxidation sets in. For breadboarding they are OK, but if this is going to be a project that is used for a while solder or protoboards are better.
     
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