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  1. hevans1944

    Real Solder

    And then ONLY if they want to sell their product to nations in the EU! And maybe California. Getting the lead out of our environment has already gone to draconian levels of coercion. First paint, and now solder. Can bullets be far behind? Oh, wait, there is already "lead free" ammunition...
  2. hevans1944

    Resistor Over Heating

    @amirabbas1234: Is your driver board, based on the Allegro A4988 DMOS motor-driver integrated circuit chip, this board from Pololu? Have you read and understood BOTH the datasheets for the chip and for it's carrier board? Do you see anywhere on these datasheets where it is recommended that you...
  3. hevans1944

    Real Solder

    Sure. Google is your friend for this sort of thing.
  4. hevans1944

    SSR triac not releasing

    Yep. Look again at the circuit diagram in post #1. The load, an inductor, is driven from 120 VAC as switched by the Magnacraft SSR. The only thing DC is the control circuit that turns the triac on and off, the problem being it doesn't turn off if the control input leads are disconnected. I...
  5. hevans1944

    What Are These Parts Called- Where Can I Get Them?

    Are you trying to rebuild an existing panel, or build a new one just like the one you show in photos? The control panel wiring shown in your photos appears to be in good condition, so why is there a need to rebuild it? Do you have a wiring diagram, or a ladder-logic diagram, of the existing...
  6. hevans1944

    Multimeter reading of LED

    Thanks, Greg. And welcome to Electronics Point. It was really astute of you to invest in a new 1973 Harley-Davidson motorcycle and then sell it for a milling machine and a lathe two years ago. I, OTOH, "invested" in a new Honda Shadow ACE with 1100cc v-twin engine, rode it for almost ten years...
  7. hevans1944

    Creationism/Intelligent Design

    The far future may not be that far. Technology, building on what it already has, is now making quantum leaps and bounds, growing exponentially at an exponentially increasing rate that is virtually incomprehensible even to futurists, much less to the ordinary layman. Some of us may have the...
  8. hevans1944

    Creationism/Intelligent Design

    Engineering on the scope you conceive has been a popular science fiction meme for a long time. All it takes is energy, time, knowledge, and will. And of course the human race has to figure out how to survive its own self-destructive intentions long enough to put it all into play. Has it been...
  9. hevans1944

    Multimeter reading of LED

    The "diode" setting on your multimeter is really an "ohms" or resistance function except, instead of resistance, it displays the voltage across the two probes while providing a very small constant test-current from a low-compliance (typically less than 9 V, often less than 1 V) current source...
  10. hevans1944

    APOLOGIES TO THE GROUP

    @TERRY67: Regardless of your OPINION that it is a "silly teen social media idea that capital letters meant screaming," there are certain customs we who post regularly on this forum try to follow. AVOIDING THE USE OF ALL CAPS WITHOUT THE INTENT TO EMPHASIZE IS ONE OF THESE CUSTOMS. It has...
  11. hevans1944

    Multimeter Question

    The time to ask for advice is before you make a purchase decision. Not guaranteed, but usually you will experience less buyer's remorse when you do your due diligence research first. Were you seduced by all the spiffy "extra features," instead of carefully reviewing the specifications to see if...
  12. hevans1944

    Battery charger questions

    Well, the nice thing about it is you are free to change it. How hard can that be?:D
  13. hevans1944

    Battery charger questions

    Unless specifically designed for "deep discharge," such a certain marine batteries, lead-acid batteries are irrevocably damaged by discharging to zero terminal voltage. Not sure why this happens, but I know from several personal experiences that it is true. Even if you do get it to accept a...
  14. hevans1944

    Understanding impedance

    It is impossible to understand impedance and reactance without understanding the math used to describe these two phenomena. If you aren't familiar and comfortable working with the arithmetic of complex numbers you will never "get it" when it comes to understanding complex impedance and its...
  15. hevans1944

    LED supplier ?

    Looks somewhat familiar. Probably armed and dangerous. Is this the old guy we picked up in the stolen car outside Wapakoneta?
  16. hevans1944

    LED supplier ?

    Well, the Mendelsons experience never gets dull, but eventually the human body becomes numb after walking up and down aisles that are several football fields in length. There just isn't enough time in a single day to stop and examine every interesting trinket, some of which might be actually...
  17. hevans1944

    Sensor choice for pond water depth

    Consider an LVDT with a float attached to the core. The M-12 series, available from http://www.te.com might do it for you. Several stroke lengths are available, but the M-12 100 (±100 mm stroke) seems appropriate for your task. If you want battery IoT operation, LVDT excitation will have to be...
  18. hevans1944

    LED supplier ?

    Two solutions: a reputable electronics parts distributor, such as Allied Electronics, DigiKey, Jameco, Newark, etc OR eBay. It all depends on how reliable and how well-specified the LEDs are that you want to use. You can get some incredible bargains on eBay from Asian sources, but IMO it is...
  19. hevans1944

    Signal generator using 555 timer

    We could give you better advice on how to use your 'scope if you would tell us which model Tenma you purchased. There is a huge range of features available on most oscilloscopes, depending on model, but virtually all "modern" 'scopes feature a linear, triggered, horizontal sweep with adjustable...
  20. hevans1944

    Erasing PIC16C54C

    I have some EPROMs with the quartz window. I have the ultraviolet eraser thingy. I had a programmer that ran under DOS 5.1 and required one slot in my PC. No idea where the software for the programmer is, nor do I want to install an ancient I/O card in one of my existing PCs. Sooo... if I ever...
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