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  1. hevans1944

    Servicing the Daewoo GB14F7T1

    A Google search using the string "romocon" was not of much help. Is this something specific to Great Britain? Oh, and welcome to EP, Robert!
  2. hevans1944

    1979 Kenwood Trio Tuner Bulb

    Welcome to EP @Natal! When posting to the forums here, please provide as much information as possible to define the problem you are asking our help to solve. A Google search revealed there were many models of "Kenwood trio receiver/tuner," but you did not tell us which model you have. If the...
  3. hevans1944

    Measure current with strange output

    No. Your thoughts, as expressed in your post to this thread, are incoherent. Please try again. And welcome to Electronics Point.
  4. hevans1944

    Cheap linear actuators

    Howsabout some spiffy photos to give us some ideas? I Googled the ESP8266 IoT thingy and may order a prototyping/development kit later this year. I was a bit put off by the itsy bitsy teeny weenie size of it though. Geez... 5 mm x 5 mm package? That will most definitely require a re-flow...
  5. hevans1944

    Cheap linear actuators

    Hmmm. Like a few quid for "emergencies" maybe? Or a few gold bullion coins as a contingency fund? Your BitCoin private encryption key? Nah. Save the hidey box for something that has permanent value.:D Properly aged single malt whisky sounds good... Lagavulin 37 Year Old Single Malt Scotch Whisky...
  6. hevans1944

    Square wave signal with ADC converter

    Why is it so hard for people who come here asking for help to tell us up front wtf they are trying to DO? I agree 110% with @BobK, the OP is far from clear. I think @Ian should consider a permanent ban on those who require an extended exchange of questions by EP responders and "answers" by the...
  7. hevans1944

    Cheap linear actuators

    I think @Ian is building a password safe, so he can write down and hide all of his plethora of passwords, while still having ready access to the ones he forgets. Or it might hold the recipe to the McDonalds Secret Sauce, or the Colonel's Secret Mixture of 11 Herbs and Spices... something small...
  8. hevans1944

    Cheap linear actuators

    No, @Ian said in post #6 that the platform drops from a concealed location in a cabinet, so it's not possible to place a lifting mechanism underneath. A scissor-jack on top would severely limit what one could place on the platform. The motor-driven linear screw mechanism is Asian-cheap and will...
  9. hevans1944

    Measure current with strange output

    This Hall Effect device available from Allergo is ideal for this application. Some signal conditioning required.
  10. hevans1944

    Cheap linear actuators

    I have an ancient "drill press" adapter for use with earlier model Dremel Moto-Tools. Instead of moving the quill (the Dremel Moto-Tool) up and down, a cam underneath the table moves the table up and down when the cam is rotated manually by means of a knob, shown below and to the right of the...
  11. hevans1944

    Electric arc...Unpredictable behaviour in a magnetic field

    Nice to meet you, too. When I was a "kid" I used to "play" with a 15,000 V neon-sign transformer, fascinated by the loud arcs it made. My first "project" was to take two steel coat-hangers and un-fold them to make a pair of stiff "V"-shaped, closely spaced, vertical electrodes... a Jacob's...
  12. hevans1944

    Electric arc...Unpredictable behaviour in a magnetic field

    The Lorentz Force is commonly used in one type of mass spectrometer to separate atomic beams of charged particles according to the mass-to-charge ratio of the constituent particles. Compare to time-of-flight mass spectrometers which separate charged particles according to the energies received...
  13. hevans1944

    Electric arc...Unpredictable behaviour in a magnetic field

    Very strong permanent magnets are used for arc suppression in high-voltage, high-current, switchgear. The magnetic field deflects and lengthens the path of the arc as a switch is opened, until there is enough path-length to no longer support the arc.
  14. hevans1944

    Remote Controlled AC Outlet

    If you want to use an existing remote control paired with device B to turn power on or off for both device A and device B, I don't think I have seen anything quite like that commercially available. However, it would not be unreasonable for a skilled hobbyist to build their own auxiliary...
  15. hevans1944

    Ever hear of a "smoke plate" ?

    There is link to download a PDF copy of the service manual available here. You have to register on the site to download it, but that's not a big deal. The manual lists part numbers for the plastic parts in question, but they may no longer be available from the original equipment manufacturer...
  16. hevans1944

    Corrosion on Button Cell Batteries

    You might consider packaging the batteries in a separate, transparent, sealed wrapper so the end-user can install them at the time of use. If any corrosion occurs, it will be immediately obvious before the three button cells are installed and then the whole package can be thrown away, or...
  17. hevans1944

    Need help reading a rectifier diode.

    Never depend on electrical insulation to protect you. When working on "live" circuits with "dangerous" voltages, keep one hand in your pocket at all times to prevent electrical conduction (shocks) across the chest (and through the heart) between the left arm and the right arm. It is also...
  18. hevans1944

    Subscript / Superscript in Editor

    Gee, @Ian, you are AWESOME! Thank you very much. I did a preliminary investigation on the World Wide Web with Google using keywords like "xenforo" and "super-script" and "sub-script" and found lots of discussion (there is a XenFORO forum for admins and programmers like yourself!), but most of...
  19. hevans1944

    Hello, varactor(varicap) formula help

    I think you might want to check your decimal points. We are discussing capacitance on the order of ten picofarads. 0.00000000001 micro-farads is 10 pico-micro-farads (pmfd), a million times smaller than ten micro-microfarad (mmfd), which is a very small capacitance indeed. OTOH, 10 picofarads...
  20. hevans1944

    Hello, varactor(varicap) formula help

    It is common practice for some end-users (or re-sellers) of large quantities of the same part number to test and "bin" all received parts according to the results of the test. With automated test equipment, it is not necessary to just sample a lot of parts to make an accept/reject decision of...
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