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    microwave crucible

    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...
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    Function Generator + LCD (Design Idea)

    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...
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    HELP!!!I NEED YOU ALL

    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?
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    How to get better current from LM317?

    I am curious about the 100uH inductor in the output leg of the regulator.  Could this be contributing to  the oscillation?
  5. L

    Holding Down Circuit

    Have you considered using double sided carpet tape?
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    Energy saving device - can they work?

    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...
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    Modulation techniques

    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.
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    Are datasheets important?

    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...
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    SERVO THROTTLE SIGNAL

    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...
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    Noise handling algorithm in 8 wire touch screen

    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...
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    insect attach

    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...
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    White noise generator for mp3 players/ipod

    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...
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    SIM cards

    Thank you for your input, Kevin.  This is what I hope to be true.
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    Freq Gen Help! - Need input in Hz instead of period...

    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...
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    SIM cards

    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...
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    pressure sensors?

    Antistatic foam that is used to store ESD sensitive chips is conductive, and will increase in conductivity when compressed.
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    stable remote ground

    Almost sorry to bump this to the top.  The only response I've had was by PM.  I'd really like to know if this is already done but with different names.  Seeing as I think orthogonally to most people, my searches don't yield as many results as they should.  Thanks for bearing with me.
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    I like to find someone to build prototypes

    When regulators fail, many alternators will produce voltages of which you speak at moderate engine speeds.  You may be able to replace the regulator and change the pulley ratios to get the power source you seek.
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    Please help on odd reference voltages

    With the resolution you seek, standard values won't get you there in one step.  I recommend choosing one common value, and for the other leg combining resistors in parallel to trim the value down. For example:  with a TL431 I would use a 10k 1% on the bottom leg which always sees a nominal...
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    my gcse project

    Let me tell you about two of my favorite temperature sensors. The LM334 is a programmable current regulator.  It is nominally a three pin device that is commonly available in TO-92 package.  This varies current linearly with respect to temperature on the kelvin scale. The LM335 is a...
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