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About Ldanielrosa

  • Birthday 04/22/1972

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  1. I'm looking into casting small parts in brass and aluminum, but I don't feel like having a full blown foundry. I saw that with the right susceptor materials, crucibles can be heated by microwaves. Does anybody have any links to forums that are involved in this? I'll probably run with this no matter how little information I have, but I'd like to know the caveats.
  2. That's a very good idea! I don't know if I should be surprised that is not standard equipment. Many years ago I paid too much by today's standards for a frequency counter, and I'm not always confident that it is working correctly. Considering how minimal the function would be for a microcontroller to do the job, I'll probably make six of them when the house is done and I can unpack my hobby stuff. As for the function generator, that may take longer for the need to drive me.
  3. I'm not sure how helpful I'll be, but it may help to turn off the caps-lock when posting here. Also, when was this assigned and how much longer do you have?
  4. I am curious about the 100uH inductor in the output leg of the regulator. Could this be contributing to the oscillation?
  5. Have you considered using double sided carpet tape?
  6. If you have the means to do so, I would certainly like to see a picture of the guts of this device. I don't know how they can claim to save any power with resistive loads like a range, toaster. or light bulb. Does anybody reckon they are designed to deceive the meter by using an amp or two at peak and feeding it back at higher current near crossover? If so it is illegal in several countries.
  7. This technique is best for that application. That and the other techniques are well suited for yon project. Sorry, I couldn't help it. Anyway, the gist is that to recommend a method we need to know more of what the implementation is.
  8. I can't help it, I just have to get into it at this point. An Engineer is a qualification as shown on paper, but an engineer is a way of thinking. I am not the first (yet). From what I have seen, Audioguru has shown aspects of the second from time to time (like me). "Looks unusual"? Please qualify this, Audioguru. It will sound too close to prejudice to the uninformed masses (like me) if this statement stands alone. Yes I agree that datasheets are important, and compliance with them is wise. There is another thread that seems to advocate something that is not strictly in the datasheet of a certain device, which may have your influence. I do believe that some logical reasons were outlined, which has the earmark of an engineer. As for the article- I haven't looked at it directly. What I've read of it here does lead me to believe that- the author was having a bad day, or it was written early in his career, or there were tradeoffs that may have resembled a marketing influence (500W is absolute, one time only, run for your life maximum rating- don't ever count on it) like my 13,000,000W stereo (fictitious device). As for the article (still haven't read it), it may be wise to append that someone who may be qualified to speak on the subject (which I believe he is) is not comfortable with the specifications as given and recommends some alterations- but the original project is not yet known to fail.
  9. I'm not all here right now, but it looked like you were asking about the "throttle" control on an engine carburetor. Reversing direction would be the transmission? If the "throttle" is actually for an electric motor, there is no guarantee that the servo standard applies- but assuming it does there are a great number of possibilities, which I dare not list for fear of making a fool of myself (which I may already have).
  10. How often can you poll the screen for the touch coordinates? This sounds similar to several other things that I've pondered. I would consider getting enough data to establish a probable center for the "boundary circle", which you probably already did. Then keep sampling input data and averaging it with the previous position. You may be able to poll the position often enough that the jitter will be less than one pixel width.
  11. To attach an insect to a spring, you need an adhesive that will bond to both surfaces. Epoxy would be overkill since it will exceed the strength by orders of magnitude, and would take too long to cure as well. Cyanoacrylate would be fast enough, but I have heard that it will partially dissolve the insect's body. The best option is likely to be a double sided tape, like what is used for astro turf on patios. As for the circuit- what to you want it to do? Perhaps a microgenerator to harness the power of the insect? A microphone to record the insect's sounds?
  12. I'm not sure I understand the full question. Do you want to generate a white noise audio file to listen to? If so there are two complications that I am aware of. First, MP3 compression works so well at saving resources by the use of "psychacoustics", which in less BS laden language means that it maps the loudest tones and their intensities. Upon playback, the tones are regenerated and mixed- the higher bitrate the more tones. White noise (or pink for that matter) contains a broader range of frequencies (theoretically infinite) than music, and their duration is very short so MP3 compression artifacts are no longer transparent. Second, the way computers usually generate random numbers may not be good enough for white noise. It may be good enough for dealing cards or rolling dice in a game, but our hearing is a bit more demanding. Any repetitive theme that happens at audible frequencies will be immediately noticed. The generation of pseudorandom bits with a slow repetition rate is not difficult.
  13. Thank you for your input, Kevin. This is what I hope to be true.
  14. I guess I should have replied earlier, but here goes. If the gizmo doesn't need to do anything else when it's putting out the frequency of choice, then what I've been working on may be of some value. On a mothballed project that I will call a guitar tuner, I have some arithmetic subroutines that convert chosen frequency into a scaler value which is repetitively added to a 24 bit sum. The top eight bits are then used to fetch a value from a table, which is fed to an output port. An input pin is checked to determine if the halt button has been pressed, and failing that the cycle repeats at adding the scaler to the sum. At a clock speed of 4MHz I can get just over 10kHz output, but not by much. The DAC (R2R ladder) is external to the uC.
  15. I've seen quite a few posts regarding SIM cards. Usually iterations of copying, reading, altering, whatever but they look like they're still meant to be used with 'phones. Did I miss something here? I'm looking at SIM cards as a removable media for embedded projects. Is this possible? I had assumed it would be, but I don't want to commit to tools and time to find them useless.
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