Al Clark <dsp@danvillesignal.com> wrote in news:Xns93AC5F400B1DFaclarkdanvillesignal@66.133.130.30:> BGAs are certainly a reality and if you want to build DSP boards you > better get used to them. Of course, there are suppliers that would love > to save you the trouble ;-)For those lurkers who don't know, Al's company makes nice little PCB's with the BGA DSP pre-mounted along with memory and other support stuff, and the signals brought out to convenient connectors. The boards are still very compact and the pricing was quite reasonable for incorporation in products with small runs. This actually wasn't the first time I saw this kind of product. I'd been evaluating the PowerPC at one point and there's a German company making similar boards with Motorola high-integration BGA PPC's. Their approach is to standardize the connectors and sell various combinations of processor boards and I/O boards to plug them into. -- Kenneth Porter http://www.sewingwitch.com/ken/
Blackfin PLCC
Started by ●June 30, 2003
Reply by ●July 8, 20032003-07-08
Reply by ●July 8, 20032003-07-08
Kenneth Porter wrote:> > Jerry Avins <jya@ieee.org> wrote in news:3F03A9C0.8C7949FA@ieee.org: > > > I use a binocular erect-image microscope with about 2.5" clearance. I > > bought the body on eBay for about $40, refurbished it and mounted it, > > using an old 1.25" eyepiece focuser meant for a Newtonian telescope. A > > pair of 10X WF about doubled the cost. It's also great for removing > > splinters. > > Which of course points to the other common practice of fine hand work under > a microscope: Surgery. Which I'll leave to folk with steadier hands than > mine! > > -- > Kenneth Porter > http://www.sewingwitch.com/ken/A pair of 3X clip-on Gallilean telescopes is another gadget I use a lot. It focuses about about 11 inches past my nose, much further than a plain magnifier of the same power, so I can use it while silver soldering. (I have a lightweight torch with a mouth bit that puts the flame at the right spot, allowing me to use both hands on the work. The whole get-up makes me look like a bug-eyed dragon.) Jerry -- Engineering is the art of making what you want from things you can get. �����������������������������������������������������������������������
Reply by ●July 8, 20032003-07-08
Jerry Avins <jya@ieee.org> wrote in news:3F0AE1B4.9614B6F5@ieee.org:> Kenneth Porter wrote: >> >> Jerry Avins <jya@ieee.org> wrote in news:3F03A9C0.8C7949FA@ieee.org: >> >> > I use a binocular erect-image microscope with about 2.5" clearance. >> > I bought the body on eBay for about $40, refurbished it and mounted >> > it, using an old 1.25" eyepiece focuser meant for a Newtonian >> > telescope. A pair of 10X WF about doubled the cost. It's also great >> > for removing splinters. >> >> Which of course points to the other common practice of fine hand work >> under a microscope: Surgery. Which I'll leave to folk with steadier >> hands than mine! >> >> -- >> Kenneth Porter >> http://www.sewingwitch.com/ken/ > > A pair of 3X clip-on Gallilean telescopes is another gadget I use a > lot. It focuses about about 11 inches past my nose, much further than > a plain magnifier of the same power, so I can use it while silver > soldering. (I have a lightweight torch with a mouth bit that puts the > flame at the right spot, allowing me to use both hands on the work. > The whole get-up makes me look like a bug-eyed dragon.) > > JerryJerry, are these the eyeglass attachments that my dentist uses? He said they are expensive? What do they cost and where do you buy them? They look like they might work well for soldering 0805 parts, SO ICs etc. H -- Al Clark Danville Signal Processing, Inc. -------------------------------------------------------------------- Purveyors of Fine DSP Hardware and other Cool Stuff Available at http://www.danvillesignal.com
Reply by ●July 8, 20032003-07-08
Al Clark wrote:> > Jerry Avins <jya@ieee.org> wrote in news:3F0AE1B4.9614B6F5@ieee.org: > > > Kenneth Porter wrote: > >> > >> Jerry Avins <jya@ieee.org> wrote in news:3F03A9C0.8C7949FA@ieee.org: > >> > >> > I use a binocular erect-image microscope with about 2.5" clearance. > >> > I bought the body on eBay for about $40, refurbished it and mounted > >> > it, using an old 1.25" eyepiece focuser meant for a Newtonian > >> > telescope. A pair of 10X WF about doubled the cost. It's also great > >> > for removing splinters. > >> > >> Which of course points to the other common practice of fine hand work > >> under a microscope: Surgery. Which I'll leave to folk with steadier > >> hands than mine! > >> > >> -- > >> Kenneth Porter > >> http://www.sewingwitch.com/ken/ > > > > A pair of 3X clip-on Gallilean telescopes is another gadget I use a > > lot. It focuses about about 11 inches past my nose, much further than > > a plain magnifier of the same power, so I can use it while silver > > soldering. (I have a lightweight torch with a mouth bit that puts the > > flame at the right spot, allowing me to use both hands on the work. > > The whole get-up makes me look like a bug-eyed dragon.) > > > > Jerry > > Jerry, are these the eyeglass attachments that my dentist uses? He said > they are expensive? What do they cost and where do you buy them? They > look like they might work well for soldering 0805 parts, SO ICs etc. H > > -- > Al Clark > Danville Signal Processing, Inc. > -------------------------------------------------------------------- > Purveyors of Fine DSP Hardware and other Cool Stuff > Available at http://www.danvillesignal.comI got mine from Edmund Scientific years ago. Last I looked, they now sell only monoculars, and I have one of those too for around $40. It screws into a holder that is a pain. (With a Gallilean telescope, the eye relief is negative, so the closer you get to it, the larger the field of view.) I made a nut with the same thread as the holder, and one of these days, I'll drill a cheap plastic lens and mount it. Doing it twice requires a lot of cut and try to get the convergence right. Your dentist's probably has optics not much better than what I've got. The cost is in mounting them with equipment that can get it right most of the time, and a surcharge to cover those times when it needs done over. Jerry -- Engineering is the art of making what you want from things you can get. �����������������������������������������������������������������������
