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  • Welcome to our site! Electro Tech is an online community (with over 170,000 members) who enjoy talking about and building electronic circuits, projects and gadgets. To participate you need to register. Registration is free. Click here to register now.

Recent content by BR-549

  1. BR-549

    Side Band-less Modulation?

    MXene rf shielding film. Here are a few links. https://pubs.acs.org/doi/10.1021/acsanm.3c02925# https://phys.org/news/2016-09-electromagnetic-pollution-mxene-mobile-devices.html https://www.sciencedaily.com/releases/2023/01/230116112540.htm There are dozens of different types with...
  2. BR-549

    Side Band-less Modulation?

    This is interesting and confusing. I was taught that all amplitudes of all emissions was continuously decreasing with propagation. Even found a universal rate. So just propagation itself causes distortion.....a distance distortion. Or a propagation distortion. I never thought of it that way...
  3. BR-549

    Side Band-less Modulation?

    Well pardon me Papa. I thought maybe people here might know more about what I had read. Let's install a film cylinder around a vertical AM antenna. Energize constant carrier. The emission has already been made without modulation. A clean single F. Now we vary the amplitude of an already...
  4. BR-549

    Side Band-less Modulation?

    That's what I thought too. But in the last 2 years or so, I have come across several articles about this, and the various methods, and the effects of such. And the different frequency characteristics. I read so many different sites, I don't save a history. But I just did a quick search for...
  5. BR-549

    Side Band-less Modulation?

    Hello, I read an article a while back where someone had come up with a film or a paint coating, that can prevent the passage of an electric field and a magnetic field....stop all EM fields. It was quite impressive. It can shield circuits from external interference or induction. And later, they...
  6. BR-549

    What frequencies can we detect?

    Thank you. The issue has been resolved. I was asking what our capabilities were at this time, not necessarily how to do it. Just if it could be done. And most of the misunderstanding came from using the same terms, in different fields of study. This was about the Big Bang, the background...
  7. BR-549

    What frequencies can we detect?

    Supposedly, these frequencies can be proportioned with the few milliseconds after the BB. To help resolve some of the WEBB findings.
  8. BR-549

    What frequencies can we detect?

    They are trying to verify the proper "z" shifts, for the cosmic expansion.
  9. BR-549

    What frequencies can we detect?

    OK, thanks. Let me ask you this, can one IR camera, one IR sensor detect that whole range of 1 to 300 THz? Or does it take a series of special sensors to do that? And does it take special conditions or setups, like ultra cold temps? What would one need to detect 100 THz on their desktop...
  10. BR-549

    What frequencies can we detect?

    If I recall right, we can receive up to about several hundred GHz. Let's say 1000 GHz or 1 THz. With electronics. Light is about 400 THz for red. 300-400 THz for IR optics. Can we detect thru 1 to 300 THz? Can we detect thru those frequencies and tune like a radio? Or tuning an IR...
  11. BR-549

    Diode Anemometer Circuit

    Just search for diode anemometer. Take your pick. I used to work for a company that made diode anemometers for military runways. All over the world. In every climate.
  12. BR-549

    Noob to electronics. Quick question

    Charge can not be pulled or stuffed into a battery. A battery has to circulate charge. When charging a battery, charge is not installed. Charging a battery is just like winding a spring. Then the spring circulates the current thru the battery. Most cars use a 12 V spring.
  13. BR-549

    Rookie needs help to understand why his A-class amplifier doesnt work (measurements and schematic attached)

    The handiest tool I found for checking and modifying an amp, or a circuit, network, component, etc, is a function generator. It lets you sweep a number of parameters and watch the effects on the scope. It eliminates the guess work and tells you immediately if you really understand the circuit as...
  14. BR-549

    Checking an IC...

    I used to repair unknown and un-doc circuits boards. I found that an octopus saved a lot of time. It not only indicated the quality of the board components, it displayed the condition of all PN junctions of the solid state devices. Including IC chips. I repaired about a years worth of old...
  15. BR-549

    Space Width Modulation

    Imagine a spoked wheel. Remove rim. Place a release button in center of hub. When pushed, the button releases all the spokes. #1. No matter the spin speed, the released spokes keep the same length. #2. The emitted spoke was emitted as a chunk, and required...
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