Search results

Search Forums New Posts
  1. KJ6EAD

    Compatible solder tips?

    Check Plato tips also.
  2. KJ6EAD

    Using an AAA battery to work a 220v clipper in N. America

    I don't think you're going to be very pleased with the run time per charge running that thing on batteries. You mentioned that 1.2V is a rare value for wall wart type power supplies. This is true and causes me to wonder if that's the correct voltage or if maybe due to some mislabeling or bad...
  3. KJ6EAD

    Re-wiring a 3v hand-fan to run off a USB cable, need help reducing voltage.

    Put a switch across the third diode labeled "TURBO MODE". :cool: When the switch is closed, you'll get ≈3.8V which the motor can probably handle, at least for short periods. You'll be able to tell if it can't by it heating up or emitting a burning insulation odor.
  4. KJ6EAD

    looking for a "center-bore" motor

    The closest thing that comes to mind is a ceiling fan motor.
  5. KJ6EAD

    Anyone tried this - DIY Solder Flux

    For entertainment only, I made my own rosin flux from blobs of dry pine sap disolved in isopropyl alcohol, filtered to remove impurities and heated to concentrate the rosin. It worked well enough but it's abietic and pimaric acid concentrations were unknown. I think I read somewhere that...
  6. KJ6EAD

    Make electronics : experiment 8 problem

    From one of my old posts on another forum: :( Destructables, :confused: the teaching site :mad: of the :eek: damned.
  7. KJ6EAD

    Blinking LED Bottle Light Chandelier

    A 556 timer driving four short strings of LEDs via 2N3904 transistors would be my suggestion for a design without a microcontroller. I'll post a video later showing two of these running densely packed LEDs.
  8. KJ6EAD

    Make electronics : experiment 8 problem

    I suspect that you have a simple wiring error. Be sure that you're working from a correct pinout for the relay you have, not just blindly following a pictorial diagram. Use a meter or even a simple improvised test light to verify the relay contact form.
  9. KJ6EAD

    Make electronics : experiment 8 problem

    I've attached the relevant images from the text. Which one represents your current problem? When using that book, keep this link handy and check it for errors in each experiment before starting them. http://www.oreilly.com/catalog/errata.csp?isbn=9780596153755
  10. KJ6EAD

    Which LED is going to work?

    The question is invalid. There are no LEDs shown in the schematic. Here's a valid question. If a student cheats on schoolwork, how does that help in his job interviews?
  11. KJ6EAD

    need a switch that will deactivate with man overboard

    Are we avoiding the readily available commercial off-the-shelf products for a reason? Too easy, don't want to be too safe, or what? :confused: http://www.iboats.com/Emergency-Boat-Kill-Switches-Lanyards/dm/view_id.216623 http://www.westmarine.com/search?text=cut+off+switch
  12. KJ6EAD

    Potting/encapsulating material

    What I see in your pictures looks like polyurethane potting compound. They're often used in automotive applications.
  13. KJ6EAD

    Potting/encapsulating material

    It's not clear from your post whether the material is a conformal coating or more. If you google tbat and potting compound, you'll find plenty of information.
  14. KJ6EAD

    Idea how to bring back concord :)

    I don't think a Roomba for runways is going to bring back your precious Monarch/B1 bomber with seats. Economics killed it as much as anything. Besides, FOD sweepers already exist. http://www.aerosweep.com/fodboss/design/
  15. KJ6EAD

    Design approach for LED lighting assembly

    Start with the array of LEDs and their heat sinks. You specified a flash rate but not a flash duration but that can be inferred from the flash energy. After you have LEDs capable of the energy and field of view you need, design the driver, staying within the source limitations. Those are the...
  16. KJ6EAD

    Needing a sealing resin

    Potting is a cleaner operation than conformal coating unless you screw it up. I mount the PCB in a potting box and vacuum degas pre and post pot. The only mess is the disposable mixing container, stirring sticks and a pair of nitrile gloves.
  17. KJ6EAD

    Needing a sealing resin

    Epoxy potting compound is the typical choice for your application. I recommend 3M DP270 but I've also used MG Chemicals 832B. http://m.3m.com/wps/portal/3M/en_US/mAdhesives/Tapes/Products/~/3M-Scotch-Weld-Epoxy-Potting-Compound-DP270?N=6081606 3294307435&rt=rud&MDR=true...
  18. KJ6EAD

    Miniture power supplies ?

    Everyone, FYI: I have hundreds of 12V supplies in the same form factor as the typical 5V phone charger. I offered to sell some to the O.P. via P.M. but he's not responded.
  19. KJ6EAD

    Basic electronics

    Anders, there are numerous difficulties with your approach to this problem. First, your motor probably won't run on AC current so simply dropping the voltage through the resistance of your heaters may not be adequate. Second, even if the motor would run on AC, it would probably spin too fast for...
  20. KJ6EAD

    led lamp assembly help

    Even if the strips are designed for 24V operation, they should light up enough on 12V to determine condition.
Top