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Point-to-point perf board construction refers to the process of mounting the components on a predrilled board and connecting the leads together directly with solder. This technique was used extensively in the pre-IC days and was even found on commercial products. With the proliferation of ICs, transistors, and other high-speed electronics, however, the point-to-point wiring method has been all but abandoned. Circuits that depend on close tolerances for timing and amplification cannot tolerate point-to-point wiring. Unless you are careful and use insulated wire, point-to-point construction invites short circuits and burnouts.
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When you are working only with low-voltage DC, which is typical of any digital circuit, you can mount the components on a perf board and connect them using special wirewrapping posts and wire. No soldering is involved; you just wrap the wire around the posts with a tool. The advantage of wire-wrapping is that it s relatively easy to make changes. Simply unwrap the wire and reroute to another post. Wire-wrapping is used most in IC-intensive circuits. You mount each IC in a wire-wrap socket, which you then cement or solder in place on the board. The sockets use extra-long posts that can accommodate up to about five wrapped wires. As shown in Fig. 6.2, each wire is wrapped around the post like the figures on a totem pole. Most designers try to limit the number of wires on each post to two or three in case they have to make changes to the circuit. Once the wire is wrapped six to eight times around the post, the connection is solid and secure as a soldered joint. Wire-wrap posts are square shaped so they firmly grip the wire. You can wrap the wire onto rounded posts, but to make the connection solid and permanent add a dab of solder to the wire. You can use this method to directly connect wires to discrete components, such as resistors or capacitors. A better approach is to cement wire-wrap IC sockets to the board and insert the components into the sockets. Bend and cut the leads so they fit into the socket. If the component is large or wide, use a 24-, 28-, or 40-pin socket. Special component sockets that have
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68 ELECTRONIC CONSTRUCTION TECHNIQUES
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FIGURE 6.2 Wire-wrapping creates circuits by literally wrapping wire around metal posts.
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solder terminals are also available. Unless the board is designed for very rugged use (where the components may jiggle loose), you don t need solder terminal sockets. Successful wire-wrapping takes practice. Before you build your first circuit using wirewrapping techniques, first try your hand on a scrap socket and board. Visually inspect the wrapped connections and look for loose coils, broken wires, and excessive uninsulated wire at the base of the post. Most wire-wrap tools are designed so one end is used for wrapping wire and the other end for unwrapping. Undo a connection by inverting the tool and try again. Wire-wrap wire comes in several lengths and gauges. For most applications, you want 30-gauge wire in either long spools or precut or prestripped packages (I prefer the latter). When using the spools, you cut the wire to length then strip off the insulation using the stripper attached to the wrapping tool (a regular wire stripper does a poor job). When you use the precut or prestripped packages the work is already done for you. Buy a selection of different lengths, and always try to use the shortest length possible. Precut and prestripped can be expensive ($5 or more for a canister of 200 pieces), but it will save you a great deal of time and effort. When you get the hang of manual wire-wrapping, you can try one of the motorized tools that are available. Some even allow you to use a continuous spool of wire without the hassle of cutting and stripping. These tools are expensive (over $50), so I do not recommend them for beginners. One tool I like to use is the Vector P184 Slit-N-Wrap. It is a manual tool that permits easy daisy-chaining going from one post to the next with the same length of wire. Like all special wire-wrapping tools, this one takes a while to get used to but saves time in the long run.
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