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Path: utzoo!watmath!wateng!ksbszabo
From: ksbszabo@wateng.UUCP (Kevin Szabo)
Newsgroups: net.analog
Subject: Re: "Just Wrap" summary
Message-ID: <2079@wateng.UUCP>
Date: Thu, 28-Feb-85 23:12:21 EST
Article-I.D.: wateng.2079
Posted: Thu Feb 28 23:12:21 1985
Date-Received: Fri, 1-Mar-85 20:40:06 EST
References: <214@ihlpg.UUCP>
Reply-To: ksbszabo@wateng.UUCP (Kevin Szabo)
Distribution: net
Organization: VLSI Group, U of Waterloo
Lines: 19
Summary: 

In article <214@ihlpg.UUCP> fish@ihlpg.UUCP (Bob Fishell) writes:
>I use wire wrap for just about everything, e.g., making
>connections to TO-220 devices like power transistors and voltage
>regulators - you can wrap right on the legs if you're careful.

This is a very bad practice that will get you back in the end.
Wire wrapping requires that microscopic cold welds form at the
wire-pin interface. The square pegs insure that the necessary
pressure occurs. A round pin does not create the pressure
and a non gas tight connection results. I have fixed many
wire wrap projects (for others) that have involved wrapping
to round pins, a quick dab of solder on the connection usually
corrects things. This is often the way I go, wrap and then
a dab of solder. If your components fit onto a dip header
use that instead.

				Kevin
-- 
Kevin Szabo  watmath!wateng!ksbszabo (U of Waterloo VLSI Group, Waterloo Ont.)