Piggybacking 74LS logic chips to confirm a suspected fault

Chuck Guzis cclist at sydex.com
Fri Dec 25 13:29:26 CST 2015

On 12/25/2015 09:32 AM, tony duell wrote:

> My feeling is that for the sort of things most of us do here, a
> turned pin socket is the most reliable of all. Yes, soldering the IC
> directly may have a (slightly) lower risk of bad connections, but
> given that we do (or at least I do) component level repairs, may want
> to remove ICs for testing, etc, there is a risk to the PCB if the IC
> is soldered directly. As you say, cheap sockets are cheap for a
> reason. They do develop bad contacts!

One recalls those execrable low-profile cheap sockets from TI in the 
early 70s.  Horrible stuff.

Aren't in fact, all wirewrap (board+pin) board sockets machine-pin?  I 
don't recall seeing one that wasn't.  Given the great track record of 
wire-wrapped designs that says something, surely.


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