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  1. hevans1944

    Hello can somebody teach me how to connect am to arduino

    Yes, it is just one of many ways to interface the Arduino to the rest of the real world. @Merlin3189 has suggested using a stepper motor, with its shaft mechanically coupled to Vc1. That would require at least two available binary output ports, plus MOSFET drivers for the stepper motor coils...
  2. hevans1944

    For Sale: Ambios Q-Scope 350 Atomic Force Microscope For Sale

    Wow! Whut a bargain! My previous employer bought an AFM that more or less replaced a TEM that was obsolete and almost impossible to maintain. They installed the AFM in a locked room and I wasn't allowed to touch it, not that I wanted to get involved with it anyway. Anything that complicated and...
  3. hevans1944

    Volts per metre

    Real-world example however, which is what the OP is asking for. Geez, @Rajinder, do the math: 1.5 volts between the opposing (oppositely charged) end terminals of a 1.5 meter long battery is... duh! One volt per meter. The electrical field strength existing in the atmosphere is about 100 volts...
  4. hevans1944

    Solar imaging continued updates

    As radio amateurs, the Sun plays an important role in our ability to communicate... at all wavelengths from DC to Light. There are several websites (for example, this one) that host an application that provides near real-time images of current sunspot activity as well as other important...
  5. hevans1944

    Solar imaging continued updates

    Nice bit of kit you have assembled there, Dave... and the photos are great!
  6. hevans1944

    Hello can somebody teach me how to connect am to arduino

    It appears that a lot of folks who "play" with Arduinos leave them tethered to a PC for convenience, as well as for accessibility to a keyboard, mouse and video display. This isn't necessary if the Arduino application software (the sketch) provides support for human interaction through ports on...
  7. hevans1944

    Issues with nulling offset voltage

    R1? R2? A gain of 1? Grounded both the inputs? What inputs? Post a schematic with parts labeled for identification during subsequent discussions: identify R1 and R2 on the schematic and post a value next to each label.
  8. hevans1944

    Power supply !!

    Getting it to work on paper does save a lot of time. Have you tried using conductive ink for the paper version?:p Please post the schematic you have been puttering around with. Most of the variable output regulated supply circuits I have seen are based on three-terminal regulators, some with...
  9. hevans1944

    Photos with phones

    It's still hard to beat a DSLR (Digital Single-Lens Reflex) camera for checking composition and lighting. I used to use a 35mm film SLR with LOTS of lenses for documentation photography. Produced wonderfully clear and sharp pictures if I did my part, but the delay required for film processing...
  10. hevans1944

    Hello can somebody teach me how to connect am to arduino

    Sure, almost anything is possible with sufficient time and the money to pursue it. How much of both are you willing to invest? This is not a teaching forum. It is a discussion forum. WTF would I want your LTSpice file? It's your project, not mine. And the LTSpice simulation for that circuit is...
  11. hevans1944

    Power supply !!

    Didn't we dance around this May Pole a few months ago? IIRC, a small negative bias source, with respect to output common, is necessary to reduce a positive, adjustable and regulated, output down to zero volts output. Adding cross-over current-limiting and transient protection are separate...
  12. hevans1944

    Hello can somebody teach me how to connect am to arduino

    You should have stated up front and immediately that this circuit was copied from this website. I hardly think it is worth the effort, but to interface this circuit to an Arduino you will need a digital-to-analog converter and one or more varactor diodes, such as this one, an SVC236-TB-E from ON...
  13. hevans1944

    Hello can somebody teach me how to connect am to arduino

    I doubt that you understand enough. @Harald Kapp offered you two methods "for controlling the frequency in a digital way." The arduino is a digital computer, so its output will be derived from digital instructions, but that does NOT mean the output has to be digital. Again, it depends on how...
  14. hevans1944

    Hard wallet for crypto

    I think it's not too complicated if you understand that a FLASH memory chipset plus a CPU plus some programming for security needs (in case the wallet is misplaced or stolen) is required. All this is available in at least three commercially available products, so ye who knows naught of...
  15. hevans1944

    Hello can somebody teach me how to connect am to arduino

    We can help, but as @Harald Kapp said in post #3, most of us do not have crystal balls or the necessary psychic skills to divine your intent. For starters, do you have a particular radio (manufacturer name and model) you want to tune with an arduino? Why do you think an arduino is suitable for...
  16. hevans1944

    Hello can somebody teach me how to connect am to arduino

    Howsabout you tell us what YOU want to DO? Then someone here will determine how "to connect an am receiver to arduino" if that seems to be an appropriate solution to whatever it is you are trying to DO.
  17. hevans1944

    Program ca3098e ?

    And also totally new to electronics. Where did you come upon the CA3098e "Programmable Schmitt Trigger with Memory, Dual Input Precision Level Detector" and for what purpose do you think this integrated circuit is used? Let me offer a clue: this is an analog component, for use in analog...
  18. hevans1944

    Huntron Tracker 2000

    @kds9591 Well, if it floats your boat, it's worth something to you. The Huntron does appear to have some utility as an A-B comparison "measurement" between a "known good" production board (a Gold Standard if you will) and a possibly defective board, whether pulled from a current production run...
  19. hevans1944

    Current sensing circuit help

    The ACS712 (obsolete part, replaced by SMD ACS723) with a 5 V supply rail, produces exactly half the supply voltage on its output pin when zero current is flowing between the input pins. With AC current applied, the output will therefore vary (sinusoidally) about a "zero" output of 2.5 V DC...
  20. hevans1944

    Air Pump

    I wasn't aware of this technology, probably an off-shoot of using rare-earth permanent magnets for the stator magnetic flux. I wonder how long it will take for this to appear in things like corded hand drills and the like? Or has that already happened and I just haven't noticed? (I am getting...
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