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  1. hevans1944

    Temperature Probe Testing

    Depending on the size and number of temperature probes you need to test at one time, a large glass beaker and a temperature-controlled hot-plate with a motorized magnetic stirrer should do the job. Maybe use two of these rigs, so you don't have to wait for the water to warm to two different...
  2. hevans1944

    Questions about printing pictures and image processing on thermal printers

    Maybe buy one of these, take it apart, reverse engineer it, then maybe duplicate the functionality. Thermal paper for imaging? Not my first choice.
  3. hevans1944

    Continuous measurement between two points approximately 2.5m apart

    I have to agree with @Harald Kapp and @bertus (post #6): talk to a sales person FIRST to see if this is a known problem, and if it is a known problem ask what the workaround solution is. Perhaps they will allow you to take a few x-rays of a phantom target to compare performance (legibility...
  4. hevans1944

    How to design power supply for Xenon lamp

    Nice paper, @Md Yusuf, but does a pulse-based design comply with all the specifications of the particular lamp, PE300BFA, that you mentioned in your original post?. That particular lamp is designed to operate under continuous DC-arc excitation. Pulsed operation may not agree with it.
  5. hevans1944

    How to design power supply for Xenon lamp

    This is hardly a task for the typical Electronics Point member. Why do you want to design and build a do-it-yourself (DIY) power supply when there are commercial off-the-shelf (COTS) units available that are designed for the PE300BFA lamp? See your attachment. I once built a power supply for a...
  6. hevans1944

    shunt resistor

    Hmmm. I tried to polish up my crystal ball with a green plastic scouring pad impregnated with some sort of abrasive compound, but instead of a clear crystal ball (suitable for remote viewing and seeing the future more clearly), all I got was a cloudy crystal ball that reveals nothing! Now I have...
  7. hevans1944

    P=I^2R formula confusion from book

    It isn't conflicting, and your assumption that the light bulbs are supplied with 120 volts is incorrect, but irrelevant. Using the equation that P x R = V2, and substituting the values indicated for power and resistance, yields a value for V (after extracting the square root of the product of...
  8. hevans1944

    Light/outlet remote status indication

    Howsabout long runs of fiber-optic cable? Easy to bury; point one (polished) end into the workshop, where it can "see" the lights, and place the house-end of the fiber wherever convenient. Add bells and whistles if you like, such as a photocell (cadmium sulfide photo-resistive cell recommended)...
  9. hevans1944

    Light/outlet remote status indication

    I am beginning to hate these so-called AI apps, such as Alexa, Siri, and the like that purport to behave like real human beings. Wife, OTOH, loves 'em. I won't be surprised if she begins to argue with 'em! So, what you need is a sensor in your room that detects your presence, plus a timer that...
  10. hevans1944

    Light/outlet remote status indication

    This does appear to be an application that could be implemented with some sort of radio-frequency link between outlets/lights in your garage and a remote receiver, with the added caveats that (1) it must be inexpensive and (2) it must have a range of at least "50 feet or so through a couple of...
  11. hevans1944

    DMM Showing Current without Current Source

    Yep, there are six stud-mounted rectifiers connected to rectify three-phase AC in the stator windings, produced by DC in the rotor winding when the alternator shaft is rotated by the engine. If any one (or more) of these diodes develops excessive reverse leakage current, it can easily drain the...
  12. hevans1944

    Understanding basic passive components: resistors, capacitors, inductors.

    To the best of my knowledge, I haven't posted anything to YouTube yet, but attached is a picture of a hand-sketched wiring diagram from this thread, titled "Reversing Polarity."
  13. hevans1944

    Figured I'd say hi

    Provide a link to my 2012 post and I will see what I can do for you.
  14. hevans1944

    How does energy work in EST device?

    Electrostatic discharges are almost always associated with a fixed capacitance, on which the charge separation is stored. The electrical energy stored within the capacitor is E = 1/2 CU2, where C is the capacitance in farads, U the potential difference in volts across the capacitance, and E the...
  15. hevans1944

    VCO in Radar Transceiver

    Follow the money. Electronics design is always a trade-off between cost and performance. The only semiconductors that I am aware of that will operate at 70 GHz are gallium arsenide, and then probably only as oscillators embedded in an integrated circuit. Rotsa ruck designing a GaAs-based IC with...
  16. hevans1944

    Radar ICs

    It's time to make Google your best friend. The link @bertus posted has a link to Infineon.com, which appears to manufacture what you are looking for. There are several others in this emerging market... MY wife's Kia Soul has several of them to warn us of vehicles in adjacent lane "blind spots,"...
  17. hevans1944

    School Project: Off-the-shelf EQ module board

    Could be that something is charging up and causing the output to distort because the board requires two power supply voltages of opposite voltage with a common ground. Try powering the equalizer from two 9V batteries, using one battery as the (+15V) supply and the other as the (-15V) supply with...
  18. hevans1944

    Negative Voltage #2

    You are wrong. As a new member, did you notice that you are responding to a four-year old thread? As for electrocution, your body is a fairly good electrical conductor on the inside, being basically a skin sack filled with water solutions containing ions permeating various organs and tissues...
  19. hevans1944

    Reloading powder check

    The best way to prevent "double charging" a shell casing is to weigh each one using a powder weighing scale. A strong light and your Mark I eyeball are also usually adequate to the task. I haven't reloaded pistol or rifle ammunition since sometime in the previous century, but it sure makes sense...
  20. hevans1944

    A question about monitoring mains power consumption

    @aferenbach: Andrew, this is an interesting app! The Allegro series of Hall-Effect current sensors seems to be the best solution. Since this is an on/off application, there is no need for a microprocessor, or a need to digitize the actual AC current. Just sensing the presence or absence of an AC...
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