Search results

  1. EdwardM

    Project help needed ..very very simple for the lot of you probably.

    Hi fotoobscura, interesting handle and even more so project. If I can throw my $0.02's worth in, my first thoughts are that a series of 4/5 LED's+resistor+battery could be put in per bubble and could have a lifetime of several weeks, but I think that at the ranges involved, the LED's will do...
  2. EdwardM

    boost converter

    Hi scuba14c the warnings section (page 70) of the app-note I mentioned earlier gives at least a partial answer to your last post Best of Luck Ed
  3. EdwardM

    Battery Substitute

    Hi magatru Good site!, I may need to use it myself soon Best of Luck Ed
  4. EdwardM

    boost converter

    Hi scuba14c apart from the HV switch, the inductor design is about the most important part of what you're trying to do, can I suggest you have a look at http://www.semiconductors.philips.com/acrobat_download/applicationnotes/AN96052_1.pdf and particularly the section on inductor design Best...
  5. EdwardM

    boost converter

    Sorry scuba14c, I get errors when trying to open your JPG Ed
  6. EdwardM

    boost converter

    Hi scuba14c can you describe L1 in more detail or post a photo? Ed
  7. EdwardM

    Duplicate threads and circuit requests.

    Hi All MP, forgive me if I take you slightly out of context, but can't agree with the statement that the site should be considered a failure.  I've looked at many community sites recently and this is the ONLY one which consistently has about 20 guests/members on-line at any given time.  Look at...
  8. EdwardM

    TRANSMISSION LINES

    Hi Alun couldn't agree more, the loonies are taking over the asylum Ed
  9. EdwardM

    TRANSMISSION LINES

    Hi audioguru here in the UK we've recently had a law passed that only licensed electricians can work on many types of home electrics.  In all the houses I've had over the years, the only wiring problems I've found are those caused by licensed electricians! AAAAArgh  ::) Ed
  10. EdwardM

    Duplicate threads and circuit requests.

    Hi MP and everyone I likewise don't see a problem with posting in the wrong area particularly as some projects take in many disciplines and it's often not immediately obvious which way a thread is likely to expand, really it's down to the moderator to organise as they see fit.  It's not...
  11. EdwardM

    TRANSMISSION LINES

    Hi Aun The site mentions 40 something volts ac, being a uni site means there's probably some integral calculus going on ;D Just to add to what you've said, I've never had a bad shock (well 1, more later) and that's because I had a good teacher - he advised that I keep one hand in my pocket...
  12. EdwardM

    TRANSMISSION LINES

    Hi Folks I just checked the Manchester University, Dept. of Chemistry site and they say: Voltages in excess of 50 V can be lethal Which confirms what I was taught many years ago when at Radio college. Ed
  13. EdwardM

    Construction design!

    Hi Ante too embarassing, thats my normal standard of construction.  Next time I build one I'll try to remember to post! Ed
  14. EdwardM

    Common LED as IR Detector

    Hi Abu there was an excellent article published in Elektor magazine in July 2004 entitled light sensor technology (measuring daylight using LED's). It is worth trying to get a copy, if only for the impedance converter circuit which has an input impedance in the teraohm region. Author was...
  15. EdwardM

    3-pin photo Transistor datasheet

    Yup Ed
  16. EdwardM

    3-pin photo Transistor datasheet

    Hi zosh the emitter is the pin nearest to the metal tab sticking out from the body Ed
  17. EdwardM

    Battery Substitute

    Hi magatru from the sound of it, the replacement battery is probably faulty and is not charging fully even if the PDA says that it is charged. To answer your questions: 1. There are counterfeit goods around, I don't know.  If you got the battery from a reputable source then it was probably OK...
  18. EdwardM

    la6541 (7wpv) datasheet / pinout

    Hi http://service.semic.sanyo.co.jp/semi/ds_pdf_e/LA6541.pdf Ed
  19. EdwardM

    What do the Address and Data Pins do on an EPROM?

    Hi V8meathead Several EPROM's are sometimes used in a system, this is why you find the pins /E and /G, the / means that they are active low (confirmed also by the small circle) and are used to (/E) enable a particular chip so that it can be read from or whilst programming, can be written to...
  20. EdwardM

    Sub for TL071

    Hi Kasamiko take a look at this Ed http://www.emcesd.com/1ghzprob.htm
Top