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  1. hevans1944

    Can Crusher - High School Physics Porject

    An electro-magnetic ballistic launching mechanism is a much more practical project than an electro-magnetic "can crusher" that has almost no practical application and demonstrates very little physics. Perhaps it isn't Politically Correct to use the word "gun" in a high school educational...
  2. hevans1944

    How to tell if an AC circuit ever gets power

    I thought so too. I kinda liked the "exploding wire" idea the OP had. That would be pretty "latchie" and it might make a big bang too. Worth a try IMHO. Be sure to use really fine wire, so the circuit breaker doesn't trip before the wire vaporizes.
  3. hevans1944

    Function generator output oscillations in an RLC circuit

    Sorry, I somehow missed that LT SPICE simulation and schematic in your original post. And may I presume that SG in the quote above means Signal Generator, and this is the same as FG or Function Generator? So, is the FG represented by the voltage source, V1, in the schematic image...
  4. hevans1944

    Laser for welding small plastic pieces?

    Ah! But can you afford to buy a pair for the wavelength you choose?
  5. hevans1944

    Function generator output oscillations in an RLC circuit

    @Braeden Hamson: It would help us to help you if you provided a sketch (hand drawn and photographed with a cell-phone camera is okay) showing (1) the RLC circuit with labeled parts values (ohms, farads, henrys), (2) how it is connected to the oscilloscope, and (3) how the function generator is...
  6. hevans1944

    Ultra Low System Clock Speed for FCC Compliance

    Well, we don't want you to make a huge financial mistake by getting your "key fob" ready for production and then finding out that the FCC won't approve it. You can build prototypes and rent time in a screen room (Faraday cage) to test for spurious and inadvertent emissions. Or build your own...
  7. hevans1944

    Ultra Low System Clock Speed for FCC Compliance

    Regardless of what you think about, or how you interpret the rules, it is the FCC that will make the final determination and interpretation of whether your product is compliant. Disagree and you will have your day (or weeks or months) in court. Penalties the FCC assesses for non-compliance are...
  8. hevans1944

    Wanted: Looking for, remote mower, solar

    Try this YouTube video for a look at one approach to a solar-powered hybrid robotic lawn mower. It appears to have a docking station to re-charge the on-board battery, but also a solar PV panel on the mower. Also take a look at this Google results page. Not all designs need a sensor wire...
  9. hevans1944

    Kw HR ESTIMATE TO COOL A CHURCH 132'l x 60'Wx 55'h - 70 DEGREES IS TARGET -

    With due diligence, and a LOT of reading, you can probably figure out how to solve your solar array sizing problem. Unless you have a huge bank of storage batteries for the solar panels to dump electrical energy into, it is doubtful your panels will be sized with enough capacity to back up a...
  10. hevans1944

    Kw HR ESTIMATE TO COOL A CHURCH 132'l x 60'Wx 55'h - 70 DEGREES IS TARGET -

    It depends on how long the refrigeration heat pump runs, which depends on the temperature difference between outside air temperature and temperature inside the church, as well as the relative humidity and how much water you must remove from the circulating air to reduce the RH to a desired...
  11. hevans1944

    Re-join 3x 1.5mm2 cable

    Depends on what kind of wire the cable is made from. Aluminum cannot be soldered but can be welded under a tungsten inert gas shield (TIG welding). Copper is easily soldered without melting the copper. Both metals can be joined by mechanical pressure fittings, although copper-to-aluminum joints...
  12. hevans1944

    Help with slowing down and reducing the noise on a shaded pole 230VAC fan motor

    No, not a resistor. It functions like a very fast switch that is turned on and off 120 times per second, on then off once each half-cycle of the AC line voltage, repeating during the next half-cycle and every cycle thereafter. A light dimmer is based on a semiconductor device that behaves like...
  13. hevans1944

    Unknown component

    The company name is Ledex, NOT Leden. They are a world-famous manufacturer of solenoids, located in Vandalia, OH, a northern suburb of Dayton near Dayton International Airport. I used to live in Dayton and once interviewed for a job at Ledex. Yours is missing the solenoid actuator, a...
  14. hevans1944

    Marconi TF 2370 spectrum analyser

    Gee, I am impressed. Be more impressed if you actually knew the site name is spelled ElektroTanya. Have a good day!:D As I said in post #4: we can't help you.
  15. hevans1944

    Help with slowing down and reducing the noise on a shaded pole 230VAC fan motor

    I seem to recall, from a power electronics course I once took (and passed) sometime in the 1970s that induction motors work on the principle of a spatially rotating magnetic field, produced by excitation of poles on the stator, interacting with the poles of a magnetic field in the rotor. From...
  16. hevans1944

    Marconi TF 2370 spectrum analyser

    Do you really have this? I doubt it. Or did you NOT wait for the zip file to be processed at the link I provided? Near the bottom of the page is this text: This file is downloadable free of charge: processing. If you wait long enough, the word processing changes to a clickable link that says Get...
  17. hevans1944

    Fast Switching Relay for High frequency Signals

    We may again be experiencing a language translation problem. The OP uses "output of a power amplifier" followed by reference to "PA output" which may be the same thing. If that is indeed the case, then PA output does not mean Public Address output but is the OP's way of abbreviating Power...
  18. hevans1944

    Mood Light Project

    Regarding your component links to eBay pages... not everyone who visits eBay wants, or should even need, to sign in just to view a page there. Regarding your image with the six blue LEDs, the battery, and the charger... if you actually read the resource here on LEDs, you would realize that you...
  19. hevans1944

    Fast Switching Relay for High frequency Signals

    So there you have it. It makes almost no sense to switch the high-level output of a PA power amplifier when all you have to do is turn its input on and off. If the PA amplifier is providing high-level audio power to the speakers, and you switch its output on and off with a relay, there is a good...
  20. hevans1944

    General Electric Questions

    WHY do you want to run without fans? That puppy will self-destruct without convection forced-air cooling. Even if you mount it inside a refrigerated compartment (chest freezer?) it will still need those two fans to circulate chilled air over the electronic components. How much do you know about...
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