> Alan B. Pearce wrote:
> >
> > >I have fitted my only PIC16F84-10/P in a high-quality turned-pin socket
> > >though. Tinned beryllium copper contacts (according to my supplier).
> >
> > These are the only sort of sockets that I ever consider using. Had too
much
> > trouble with cheaper ones over the years.
> >
> > They also make great "pin savers" for putting a chip into that is going
to
> > be fitted and removed many times, such as UV erasable chips that are
used
> > for development. The socket pins have the nice touch that they will fit
into
> > the same sort of socket and make reliable contact. Then if you bend and
> > break a pin on your chip saver socket, you put the chip into another
socket.
>
>
> Turned-pin sockets (even the best gold plated ones)
> are not good for multiple insertions. Or should I say
> the socket is good for it but the chip won't be.
> I keep two types of sockets, turned-pin gold plated
> for finished devices, where the chip is inserted once
> and stays in there, and the cheaper double flat sprung
> type for anything where the chip will be pulled in/out
> a number of times, like development and test boards.
>
> The turned pin sockets work by CRUSHING the chips pins
> and getting good contact. But if that chip is pulled
> in/out 3 or more times you will feel it get noticably
> looser as the soft chip pins wear on their edges where
> the crush happens. This is bad. They are not meant
> for multiple insertions.
>
> The double flat sprung sockets have two spring devices
> and press flat against the flat chip pins, and are ok
> for hundreds of insertions.
> :o)
>


Agree.
The AMP Champ double wipe sockets are relatively cheap and superb in
reliability.
They work well for multiple insertion use.


RM
.

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