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  1. EdwardM

    Construction design!

    Hi All doesn't look too dissimilar to a standard first try HF air-wire found in most electronics labs, minus the bird of course  ;D Ed
  2. EdwardM

    Board Design Programs?

    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...
  3. EdwardM

    Electric Lock

    Hi Kasamiko (Thanks GreekPIC) My uncles design used a modified lock on the door and it could also be opened with a key in the event of a power failure. Ed
  4. EdwardM

    Electric Lock

    Hi looks something like this... Ed
  5. EdwardM

    Electric Lock

    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...
  6. EdwardM

    Electrolytic cap polarity markings

    Hi audioguru Don't know, but it caught me out some years ago, I'd guess at about the time when most cap manufacturing started being done in the far east. Cheers Ed
  7. EdwardM

    I have small quistion

    Hi icetuser8 Google search first hit...SCADA  http://ref.web.cern.ch/ref/CERN/CNL/2000/003/scada/ DCS  http://www.sixnetio.com/solutions/dcs.htm Ed
  8. EdwardM

    How to sens a laser with No error?

    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...
  9. EdwardM

    To Find Working transformer

    Hi alkv23 What kind of transformer do you need to check?, there are many kinds and each will have different requirements for testing. Types of transformer: Power (mains) Audio Pulse Radio Frequency (RF) and others which are less frequently encountered. Best of Luck Ed
  10. EdwardM

    TRANSISTOR ATTENUATOR?

    ;D Absolutely  ;D Ed
  11. EdwardM

    TRANSISTOR ATTENUATOR?

    Hi prateeksikka Nearly correct but consider what happens when an inductance suddenly loses its current  ;D Best of Luck Ed
  12. EdwardM

    Conversion of square wave to sine wave

    Hi MP Couldn't agree more, one of the more pleasant aspects of this community is the relative lack of FLAMERS and the helpful attitude of most of the people involved. Whilst English is the common language here, it should be remembered that not everyone has it as a first language or that they...
  13. EdwardM

    Conversion of square wave to sine wave

    Alun Thanks, just pointing him in the right direction Ed
  14. EdwardM

    Conversion of square wave to sine wave

    Hi ebena as a starter, remember that a square wave can be constructed from an infinite number of sine waves, therefore in theory a suitably narrow band filter will be *all* that is necessary Best of Luck Ed
  15. EdwardM

    PIC information

    Hi Jade There is a wealth of information available on the web about PIC's... The first place to look for information on a specific PIC is Microchips website http://www.microchip.com If you are a beginner with PIC's then here is an place to start http://o.webring.com/hub?ring=picmicro Perhaps...
  16. EdwardM

    Need Ic which can Enable Its outputs One by One!

    Hi again Or alternatively, you could use a series of flip-flops with common clock/clear and Q output taken to D input of next flip-flop Best of Luck Ed
  17. EdwardM

    Need Ic which can Enable Its outputs One by One!

    Hi Shahriar Looks like an ideal and simple job for a PIC - perhaps 16F84?, Port A 8 bits, Port B 5 bits. Best of Luck Ed
  18. EdwardM

    Shaft Encoder

    Hi The two pictures don't show up, can you repost Ed
  19. EdwardM

    new idea.. help~~

    Hi birdbird, can I suggest a very good starting point for you, which is to read a book call "Who is Fourier?" (ISBN 0-9643504-0-8) which is an introduction to Fourier transforms but more importantly builds up to an understanding of the subject based on the differences between sounds. Best of...
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