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  1. hevans1944

    Magnet pole pieces...

    Sure, what @davenn said. And the next time you visit the northern panhandle of Floridia, be sure to drop by Destin and visit Fudpucker's Beachside Bar and Grill for a family-friendly humbuckin' good ol' time, courtesy of their house band.:cool:
  2. hevans1944

    Can a low side driver control three N-type MOSFETs connected in series?

    This is a pretty deep rabbit hole to dive into unprepared, which I did a few years ago, thanks to the Internet, out of curiosity rather than conviction. I am still unconvinced, but like the folks from Missouri, "show me" and I could change my mind. The head honcho behind the zero-point energy...
  3. hevans1944

    Can a low side driver control three N-type MOSFETs connected in series?

    Or, in the United States of America, the Pacific Intertie Network.
  4. hevans1944

    Can a low side driver control three N-type MOSFETs connected in series?

    It is too bad that you have somehow wandered into an open forum of skilled hobbyists, some of whom are also professionals in their field. We exchanges ideas and solutions freely here, although some members may make other arrangements in private messages that include some sort of recompense for...
  5. hevans1944

    Magnet pole pieces...

    By using the extended pole pieces you have essentially created a "horseshoe" magnet. Almost all the magnetic flux from the original bar magnet will now be directed into these two pole pieces, where it will have little external effect. Instead, the flux (in air) from the original bar magnet now...
  6. hevans1944

    Create controlled 50v pulse

    Yeah, me too, but all the latest and greatest stuff seems to be readily available only in SMT packages. It's a worldwide conspiracy that we cannot do anything about. One possible solution is to purchase SMT-to-DIP adapters and solder the SMT devices to the headers. Now you have a package good...
  7. hevans1944

    Why Flyback and Forward Converts aren't used in high power applications

    Efficiency at various power levels for various circuit topologies is extremely variable. There is no general answer to your inquiry. A given transformer, for example, may exhibit 98% efficiency meaning only 2% of the input power is converted to waste heat while 98% is converted to an appropriate...
  8. hevans1944

    Unknown 3 Phase delta 2 Box

    Well, it looks like you at least have a pretty nice aluminum Pelican case. The two 480 VAC to 120 VAC control transformers are probably useful for something, as are the fuse holders, test lead jacks and the industrial rotary switch. I would remove all that stuff, find some aluminum sheet to...
  9. hevans1944

    Trying to assemble a high voltage low current PSU

    Problem is the OP has stated: I agree this is a simple hack, but it may be beyond the capabilities of the OP. It is also now very difficult to purchase 300 V batteries, not that you are suggesting that, but when you do find some they have absolutely outrageous prices. An easier (not necessarily...
  10. hevans1944

    Need help finding power source for solenoid

    Sounds like what you really need is an electric strike lock mounted in the door frame. Below is an image of a typical one offered on Amazon for about twenty-four bux. A momentary pulse of 24 VDC releases the striker plate and allows the door to be pushed open:
  11. hevans1944

    Once a minute chirp...

    I would imagine those would operate for years, essentially the shelf life of the batteries, except for the occasional explosion or two. :eek: My Air Force compatriots always used line-operated neon chasers because 45 V "B" batteries were hard to come by. A simple half-wave rectifier, a couple...
  12. hevans1944

    Once a minute chirp...

    @Externet: Back in the day, neon lamps were ubiquitous and cheap. Just about anything that operated from a convenience outlet had a neon lamp, with a built-in current-limiting resistor, to indicate when power was on. NE-51 with a bayonet base was the popular choice for socketed replacement...
  13. hevans1944

    Once a minute chirp...

    This so-called "beeper" requires a separate, external, square wave signal source in addition to 3.3 to 5 V low-voltage power. A better choice, perhaps, is this one sold by Amazon that operates from 3 V to 6 V. You will still need something to generate the one-minute timer function... maybe a...
  14. hevans1944

    Movement sensor

    @Inverness: Thank you for your clarification! The 3D CAD concept drawing is also appreciated. I will try to answer the questions you have posed so far, but I am sure there will be other questions and answers brought by you, as well as by other responders. That is the nature of a dialog and the...
  15. hevans1944

    Limiting the movement of a motor.

    At the risk that the OP has already solved their problem and moved on, I hereby bump this old thread to mention a device called a rotary solenoid. This is an ordinary solenoid whose armature is pulled in and forced to rotate by means of three ball bearings mounted between inclined planes. The...
  16. hevans1944

    Movement sensor

    I think we all are. That's why I asked all those questions in post #7, just to try to define WTF the problem really is if a simple LED and photodiode or phototransistor optical interrrupter or reflector configuration is unacceptable to the original poster. And then there is the mention of an LDR...
  17. hevans1944

    Movement sensor

    Please tell us what you are trying to DO with regard to a coin and a horizontal slot through which the coin somehow passes. Do you want to detect when the coin has completely passed through the horizontal slot and is in the process of dropping into the enclosing "room," or do you want to detect...
  18. hevans1944

    hi fellow hobbyists.. ?about sensors

    Nah, I am moderately ancient. You, OTOH, are ripely mature...:D
  19. hevans1944

    Marconi TF 2370 spectrum analyser

    Yeah, that's probably why it was compressed to a 6.5 MB ZIP file at the original link I provided.
  20. hevans1944

    hi fellow hobbyists.. ?about sensors

    Problem is, most newbies either cannot or will not take the time and put forth the effort to ask clear questions. 99 44/100% of the time they already have a preconceived notion of the "solution" to their "problem" and just want "a little help" actualizing what they believe is their solution. So...
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