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EdwardM

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Posts posted by EdwardM

  1. Magnet Wire or Enameled Wire?

    in Theory articles

    Posted

    Hi Xenobius

    ??? Doh, it's late

    the illustration reminds me of those anti-theft devices fitted to high value goods in shops which gives me the idea of using a largish lump of sellotape or similar, sticky side up and carefully wind around that.

    As I said it's late, hope this helps

    Ed

  6. Magnet Wire or Enameled Wire?

    in Theory articles

    Posted

    Hi All,

    thanks to tnk2k, I can can see that my post was not as unambiguous as it might have been...

    single strand insulated copper wire


    By this I mean enamelled copper wire.

    As I said, I've heard the term 'Magnet Wire' but never in the UK, I suspect it's something originally from across the pond, perhaps someone from there could enlighten us?

    All the Best

    Ed

  7. PT100

    in Electronic Projects Design/Ideas

    Posted

    Hi Junaid

    would you please stop SHOUTING, hotwaterwizard has provided links to get you started.

    Perhaps it would help if you could tell us the range of temperatures that you wish to measure, is it 0-100C for example or the full range of the sensor?

    Best of Luck

    Ed

  8. Magnet Wire or Enameled Wire?

    in Theory articles

    Posted

    Hi Xenobius

    over the past few years I've designed a number of transformers and coils and whilst I keep hearing the term 'magnet wire' I've never used anything but single strand insulated copper wire.  My guess is that the wires insulation properties are geared toward the production of coils e.g. insulation class (temperature), resistance to chafing and breakdown voltage, no doubt other properties as well!

    Hope this helps

    Ed

  9. Optical guitar pickup

    in Inventive/New Ideas

    Posted

    Hi Alun

    basically, none at all and the magnetic pickup is well proven and cheap. Using the type of thing I suggested would probably get people involved in DSP and the higher realms of mathematics.

    But the original question was about designing an optical means of achieving the same thing - probably its most important outcome was a learning exercise and, don't know about anyone else but that's one of the main reasons why I enjoy this forum.

    All the Best

    Ed

  10. Optical guitar pickup

    in Inventive/New Ideas

    Posted

    Hi

    this is the sort of thing I was thinking of, a Fairchild 2048x1 pixel sensor.  Whilst many are designed for use with scientific instruments, I'm sure that you'll find others which are much cheaper and which could be used either staggered or in line to cover the full distance beneath the strings and to include pitch bending

    Best of Luck

    Ed

    post-8387-14279142213616_thumb.gif

  11. Optical guitar pickup

    in Inventive/New Ideas

    Posted

    Hi moeburn

    I recently did some design work on an absolute angle encoder, arising out of that I looked at 'other' ways of achieving a solution.  One of these ways was to use a cmos strip or CCD sensor, there are a few companies, mainly in California which supply them and which may be a solution to your problem, I'll take a look at my notes and come back later.

    Best of Luck

    Ed

  14. Electric Lock

    in Electronics chit chat

    Posted

    Hi

    likewise, I recently freelanced for a company which used a swipe card entry system, every time the system failed, NO ENTRY, you had to hope you could attract someones attention inside who could open the door in the old fashioned way!

    Ed

  17. Board Design Programs?

    in Electronic Resources

    Posted

    Hi crazy_azz_mat

    I've used Target 3001 and it's very good and has lots of support.

    The one I currently use is Eagle as I find it slightly more intuitive to work with, it too has lots of support on the web in the form of tutorials, FAQ's and libraries.  The free version has a size limit of, I think, about 10x8 cm, which is more than big enough for general projects.

    Whichever program you end up with, you'll find you need a lot of practice to become proficient and I've yet to find one which is easy to use in making new IC's/packages - it can be done but I don't find it simple.  ???

    Best of Luck

    Ed

  20. Electric Lock

    in Electronics chit chat

    Posted

    Hi Kasamiko

    back in the 'ol bicycle shop days, my uncle showed me an electric lock that he'd designed, it consisted of a C and I core mains transformer with the C part fixed and the I part vertical and free to move laterally in a guide.  The free side of the I part was attached to a door-bolt so that when mains were applied to the transformer the I part jumped back to the core and completed the magnetic circuit pulling the bolt open.

    Sorry if this sounds like a patent application but I've just changed PC's and haven't installed my drawing program yet, will try later.

    Best of Luck

    Ed

  23. How to sens a laser with No error?

    in Electronic Projects Design/Ideas

    Posted

    Hi Shahriar

    one way to do what you need is to have two or more beams separated by some distance so that, for example, a bird flying through one beam wont trigger the other(s).

    Some other non-laser ways to achieve the same thing: It just depends how much technology you want to include...

    Pressure pad which must be stepped on (or stepped off) to initiate timing.

    Sound level switch, if a loud noise initiates start.

    Someone looking at start line, press chronometer start button.

    etc

    Best of Luck

    Ed


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