Recent content by Nettron

  1. Nettron

    detect broken wire without removing the rubber

    If we are talking line voltages there are commercially available handheld non-contact live wire detectors you can buy cheaply, i use them often on the job. http://www.industrialnewsroom.com/fullstory/22783
  2. Nettron

    Night rider scanner

    Excellent Ante, a keeper , thanx.
  3. Nettron

    Project Help

    I use Irfanview, it can convert a great many file types. I mainly use its screen capture feature on the options tab, with it i can copy, save to a file and convert a screen image in just one click. http://www.irfanview.com/
  4. Nettron

    Night rider scanner

    Too bad thay dont have English built-in too ;D, kidding!
  5. Nettron

    Night rider scanner

    Ooops, meant to say non-volitile EEPROM's.
  6. Nettron

    Night rider scanner

    I assume by "microprocessor" we mean a microcontroller, yes ive seen that suggested on other forums. A controller such as the PIC can simulate in software just about any logic circuit. I agree this would be a good option if the IC count and "wiring" become too great, but like MP mentioned thats...
  7. Nettron

    Night rider scanner

    I mean the pendulum concept not the type of IC's used, although cmos would be better when it comes to power consumption, especially if we're talking portability. Taking a backseat at the moment i guess, im sure it can be refined, perhaps use a sinewave oscillator to drive a 3914('s). Making it...
  8. Nettron

    Night rider scanner

    Appearently not all that original . http://www.eki.com/product.asp?number=2009 Maybe add a few more rows of LEDs, with different numbers of LEDs in each row, to simulate the "string" with the longest row representing the bobbin at the end. Maybe this belongs in another thread ? Appears...
  9. Nettron

    Night rider scanner

    Remember i didnt have a LM3914 and was using LM339 comparator IC's. The idea i had in mind to solve the non-linearity problem, without adding another IC , was two-fold: 1. use different amounts of feedback around each comparators to "pull" the input voltage over threshold at appropriate timing...
  10. Nettron

    Night rider scanner

    Yes i was looking at that earlier, nice little compact design. Its also available from Doctronics in kit form here: http://www.doctronics.co.uk/kits.htm#chaser Unfortunately wasnt enough LEDs for my app. Yep had looked into that as well, was thinking about taking the ramping voltage right...
  11. Nettron

    Night rider scanner

    Audioguru, you have a point there, i was thinking the same thing when i was first designing the thing. Wish the 74154 had had some type of F-F and up/dn counter built-in. I had thought about using a 4017 but it would only give me sequencing in one direction with 10 LEDs. Do you know of a stand...
  12. Nettron

    Night rider scanner

    Heres a schematic of my up-down sequencial LED flasher that can sequence 16 LEDs, not sure how many LEDs were used in the original knightrider car . http://onfinite.three10.com/libraries/display.php?lid=8114&d=c524448053f994bcb48126b1b3904945
  13. Nettron

    Help in simple project design

    Desmond, i see what you mean but im assumimg you will not be using the tester on an IC that has power connected to it ? To better explain what i mean with the sequencing scheme would require a schematic. Not sure what kind of results it will give you i havent breadboarded it yet but looks...
  14. Nettron

    Help in simple project design

    MP, your missing the point, it doesnt matter what type of IC is being tested....but anyway, to overcome the problem with the 4066 or any other type of analog switch, you could use a sequencing scheme to multiplex the LEDs one by one. If two pins are "shorted" two LEDs will come on (light up).
  15. Nettron

    Help in simple project design

    MP, im aware of what is meant by pins being shorted together, what im getting at is that internally IC pins generally do not short together, a short occurs from input to power supply ground or Vcc, depending on polarity. If by "shorted together" the OP is referring to bad soldering between...
See more
Top