[NTLK] overclocking the MP2x00
anasazi4st at me.com
Wed Feb 24 14:34:25 EST 2010
I got my switch (as well as the 5.00MHz crystal) locally here: http://www.circuitspecialists.com/prod.itml/icOid/7623 . I'm planning on mounting it just below the surface of the small hole I'll cut between modem blank (the plastic insert on the right) and the serial port. I'll use the stylus to "flip" it, so it won't stick up through the plastic and possibly interfere with the serial port dongle.
It used to be 10-15 years ago when I worked on electronics projects in the Phoenix area there were several small shops (like that one)...I've been out of this area for a few years, and last week when I started looking for the crystals I found that nearly all were gone--closed. The reason seems to be the proliferation of online suppliers--even the electronics superstore chain Fry's Electronics used to have small components, but they're slowly getting out of that as well, which is too bad. I'm as likely as anyone else to buy online for most things...but for something like this you really need to see the switch and try it out to see how it will fit (yes I took the Newton with me). I pored over tech sheets from some online stores that gave measurements...but it's SOOOO much easier to just test-fit the part.
One of those that I was looking at online (before going to Circuit Specialists) was here: http://www.mouser.com/Search/Refine.aspx?Keyword=spdt+slide+switch . Some of those looked promising (especially around page 3 or 4)...I might still order some of those "just in case" I'm not happy with the one I just bought. AND they also stock BOTH the 5.00MHz and the 3.686MHz crystals.
Removing the old crystal was really no big deal for me...I have a Mac Classic that had some logic board problems, and finding a replacement board is difficult and kind of expensive. I replaced all the small can capacitors thereon with newer ones, but the problem was still intermittent. In the end I coughed up the $$ for a new board on eBay...that now sits in my closet. =/
>Well done! Safely removing the crystal is probably the greatest
>Where did you get the switch? I have had no success.
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