Search results

Search Forums New Posts
  1. hevans1944

    Detect 5v button push on separate system

    As always, the "best" solution is the (1) one that works and (2) the one you can afford. I have several solid state switches designed to switch mains-voltage resistive loads such as incandescent lamps. I assume these are TRIAC-based devices that commutate (switch off) each time the AC line...
  2. hevans1944

    Detect 5v button push on separate system

    Solid-state relays (SSRs), especially those that switch DC loads, are attractive for many applications. However, the OP wants to ground s 3.3V line, which leads me to suspect that said line might be a relatively large source-impedance, logic-level, signal line... perhaps used as an active-low...
  3. hevans1944

    Phase voltage Measurement

    Well, since you didn't bother to post an image (schematic) of the circuit, we don't understand it either.
  4. hevans1944

    Detect 5v button push on separate system

    Energize the coil of a small relay from 5V_in using the push-button switch to connect 5V_out to the relay coil. The other terminal of the relay coil connects to the "common" or "ground" of the 5V supply. This would be your System A: For your System B: Use a pair of normally-open contacts on the...
  5. hevans1944

    Problems with touch captive sensor

    Welcome to Electronics Point, @AkashMali! Please upload a sketch of your circuit with some sort of annotation showing the time delay you are trying to reduce. And please tell us what a "touch captive sensor" is and where to procure one.
  6. hevans1944

    Hello all from central texas.

    Hello KG5IF! Welcome to the forums! Are you a ham?
  7. hevans1944

    How would you diagnose a cordless keyboard?

    A "nice" cordless keyboard that doesn't work may have an internal battery that isn't being re-charged. Or, if replaceable dry cells are used, they may be "dead" or corroded. Please tell us the name and model of the keyboard. Do not store batteries in unused electronics equipment. Even if...
  8. hevans1944

    How to control Arduin using STONE HMI to implement a beauty instrument project

    It appears that @bancroft is a shill for the STONE HMI color touchscreen, made in China, with no specific problem or question in mind.
  9. hevans1944

    What component type to use?

    There is always a peaceful as well as destructive prospect for any human endeavor. I do miss working with the "toys" modern weaponry can produce, but am simultaneously grateful that (so far) nothing really serious, like thermonuclear war, has resulted from that play. My wife is an artist...
  10. hevans1944

    What component type to use?

    Working with CO2 lasers can be an expensive proposition, especially if you need to fill the resonant cavity with so-called "laser gas" periodically. I had to do this to fire up a folded CO2 bench-top laser rated for 300 watts at the Air Force Weapons Laboratory in Albuquerque NM. Laser gas is...
  11. hevans1944

    Force Feedback for i.e. Logitech Yoke

    This is a very interesting thread. Realism from a simulation! What will they think of next? Years ago (in another century) we were tasked with finding out how a real pilot would control a "joy stick" if he or she was tasked to use it to keep a "tracking dot" centered on a circular target. The...
  12. hevans1944

    What component type to use?

    Wow! Sixty watts, assuming a focusable Gausian-profile beam, and a suitable lens, this is a real TOOL of a laser! IIRC, one of the moderators here recently purchased one of those Chinese wonders for integration into some sort of 3D, CNC-based, cutting machine. There are pictures somewhere on...
  13. hevans1944

    What component type to use?

    Thank you for your confidence. I have been using the Internet to access DigiKey for over thirty years and still haven't discovered everything they offer. Alas, some problems don't seem to have a practical solution. So, maybe it's time to break out that Arduiino Uno kit you bought on a whim and...
  14. hevans1944

    Function of capacitors in Royer oscillator

    What does this mean? What is a "slightly modified Royer oscillator circuit" and where can we find a schematic and parts list for an un-modified Royer oscillator, although I suppose we could look up George H. Royer's 1954 patent US2783384A? What is the RF output frequency? Your o'scope wave forms...
  15. hevans1944

    Oscilloscope Connection Question

    Messin' with electrical power, provided with the full faith and credit of your electric utility, can lead to dire consequences for the uneducated and/or the inexperienced. Think of the words "short circuit" and up to 10,000 amperes short-circuit current before a circuit breaker opens. Only use...
  16. hevans1944

    Ampere/voltagemeter

    Sometimes it helps if we can see "the big picture" before jumping in with advice. So, please tell us (1) wtf your "project" is and (2) why it would be "interesting" to add digital motor-voltage and motor-current indications. Since the power supplied to the dc motor is in the form of pulses...
  17. hevans1944

    Ampere/voltagemeter

    I don't know how old you are, or how long you have been interested in electronics, or what your current skills are, but no one follows the path you have chosen without learning some new skills. Entering a dialog with other EP members, in addition to resources you find on the Internet, is a good...
  18. hevans1944

    Ampere/voltagemeter

    I believe @Bluejets is correct. These el-cheapo meters do share a common ground with the meter supply (thin red and black wires). They also do not measure negative voltages or negative currents with respect to "ground". Here is a link to a rather lengthy discussion of how (and how NOT) to wire...
  19. hevans1944

    COVID-19

    77 here, 78 if I make it to June 25. So far, so good! I became "fully vaccinated" in December 2021, but my wife is not vaccinated at all. My pulmonologist scared me into getting "jabbed" because of my co-morbidities of heart failure, type 2 diabetes, and age. He said if I got a COVID-19...
  20. hevans1944

    ADC 12 BIT PIC18F4423, How to combine and shift the adresh and adresl in assembly?

    Your first statement in post #2: RTFM ;) is the key to using any PIC... well, successfully using any sufficiently advanced technology, actually, unless you happen to be a real magician. Read The Fine Manual! As I have said before, Microchip always somehow manages to stuff ten pounds of "stuff"...
Top