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  1. Externet

    Is there a name for this type of motor ?

    Thanks. I believe am saying it right, stator brushes. Of course they contact the rotor. But not very static/fixed either. The brushes assembly mounted on a movable plate able to be rotated by the speed lever. Continuously variable; no steps, no winding taps. Zero electronics inside, no...
  2. Externet

    Is there a name for this type of motor ?

    A kitchen mixer in the sixties had a variable mechanical speed control that changed the angle of the stator brushes by sliding a lever. Tried to fix it as a kid when failed but did not understand how it worked. And still not. So, decided to ask now, just for curiosity. Found a picture, here it...
  3. Externet

    Sony Watchman conversion for ATV reception

    Get one of these NTSC to ATSC converters, sometimes can be found at pawn shops also: ----> https://duckduckgo.com/?q=atsc+tv+converter&t=canonical&ia=images&iax=images Edited -- Sorry... totally goofed, misread ATV as ATSC. Would you have a 'cable box' behind your spider webs ?
  4. Externet

    Varying voltage

    Just get one of these : ---->...
  5. Externet

    Arduino Sound generator wanted

    Or without arduino, an orphan smartphone with a proper audio generator application. One of maaany : ----> https://play.google.com/store/apps/details?id=com.finestandroid.soundgenerator&hl=en
  6. Externet

    Cheap linear actuators

    Another way... using instead of below, a single wide cylinder as cam... ----> https://www.amazon.com/Aluminum-Platforms-Scissor-Mechanism-Lab-lifting/dp/B01CKXR0HK Some mechanisms canibalizable from junk car seats, sunroofs, headlight doors, windows...
  7. Externet

    Reduce off grid freezer startup current?

    Whatever the trick method is; there is maaany on the market, also 230V ----> https://duckduckgo.com/?q=power+saver+&t=canonical&iax=images&ia=images Read the abundant comments on the web also. The thing is I started using the gadget when living in a small apartment with gas heating. That...
  8. Externet

    Reduce off grid freezer startup current?

    Well, curious about your comment; with no need to defend the item, opened it for the first time. A substantial finned heat sink for the MT2 - 3 pin TO something semiconductor, vented case back, and a not simple circuit board with no 'capacitors' makes it an elaborated scam. I do not know what...
  9. Externet

    How to build a 15,000 Gauss hand-held electromagnet

    "Small hand held" means nothing; What is 'small' ? Like a clothes iron ? A marble ? A couple of proper permanent rare earth magnets canibalized from defunct hard drives will have that 1.5 Tesla strength. And truly hand-held. No batteries needed. Just attach a handle to its pole piece; do...
  10. Externet

    Reduce off grid freezer startup current?

    The nearest I could suggest is : In use for the last 10+ years with my refrigerator, has never failed, and seems to do its work. Do not know if exists for 230V, or if works at start/run/both.
  11. Externet

    Forum Category Feedback

    Thanks for the efforts on polishing layouts and keeping things running smooth. If there was a way to select between the old format and the new one for a period of few weeks/months, we could adjust/migrate to the new style at our pace.
  12. Externet

    Lead acid battery - how long can it be left discharged?

    It has always been my religion... A lead-acid battery kept discharged over 24 hours will never recover to its full specifications.
  13. Externet

    LED in distilled water?

    Do not be concerned about the flammability of oil. Automotive fuel pumps work with their brushed motors immersed in the gasoline flow path without exploding. (there is no oxygen) I use "baby" oil inside complex electronics housings with zero problems.
  14. Externet

    Looking for an underwater ranging device

    The 'cable rail car' can house a movie camera instead of a photo camera... The first link includes laser ranging gadgets, not only ultrasonics, near your budget... The brushed or not condition for the motor does not change the need to waterproof shaft/bushings. Out of the box... Explore if the...
  15. Externet

    Looking for an underwater ranging device

    ...To the swimmer belly button and lay mirrors at the bottom of pool... :)
  16. Externet

    Led from Mercedes headlight

    I would try first briefly with 2 AAA cells in series for 3V and mark red the + wire at the polarity that turns it on. It may be faint. Then the polarity is known. Next, depending on the voltage supply you want to use, calculate a series resistor, for which you should have an educated guess of...
  17. Externet

    Led from Mercedes headlight

    Well, difficult is one thing; proper is another. You can try feeding each led emitter with a current limited voltage source to the emission level of satisfaction under the smoking point.
  18. Externet

    Possible LCD dead line repair method?

    Check if the LCD panel joins the circuitry board with a zebra connector. If so, try cleaning/reseating/tightening as in several demonstrations on the web like : ----> . -Be gentle-
  19. Externet

    Looking for an underwater ranging device

    Unclear... move up Δ and down ∇... do you mean instead, along the swimmer direction forth and back ↔ ? The video camera 'on-a-cable-car' to grab onto the wire for wheeled propulsion or just for guidance using propellers ? The distance measurement can be the same equipment as in ultrasonics...
  20. Externet

    Serial to USB back to Serial... can I do it?

    One like these ? ----> https://duckduckgo.com/?q=usb+to+serial+adapter&t=canonical&iax=images&ia=images
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