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  1. hevans1944

    How do I make my own musical instrument?

    MIDI = Musical Instrument Digital Interface This is a serial communications protocol and connector definition specification that is typically used by a keyboard to control a synthesizer. There are other interface devices that could also be interfaced to MIDI, such as drum pads, but the MIDI...
  2. hevans1944

    Identifying a chip

    The Arduino would make be an excellent human-machine interface (HMI) between the sheet metal cutting and folding machine and a laptop PC, via the USB port. You will need the PC, and a program you write for it, to set up a new user interface (a graphical interface preferably, rather than a...
  3. hevans1944

    Beginning electronics, understanding whats actually happening

    This thread seems to have wandered off-topic and degraded into argument rather than enlightenment. Here is a re-print of most of the original question: Belaying for a moment a consideration of the dimensions and depth of "nothing else," there have been a few good comments that all seem to boil...
  4. hevans1944

    Identifying a chip

    There is no certain way to success, even if you reverse engineer this board. To do that would require input of the circuit board traces and vias into a program that would reconstruct the net-list of connections, and from that information you manually decipher what ICs belong in the sockets. You...
  5. hevans1944

    Help with a project idea

    Oops. A Senior Moment there. I should have looked it up before posting. Thanks for noticing, Bob. So, after a Google search on "arm vs avr microcontroller" I found this to add to my confusion: Then I discovered that Microchip has purchased Atmel, so the OP now has a multitude of options...
  6. hevans1944

    DIY Electric Shocking Mouse/Rat Trap

    Hmmm. Are there different YouTube entertainment categories for rodent death by (1) drowning, (2) electrocution, (3) evisceration, (4) impaling, (5) beheading, (6) poisoning, (7) incineration, (8) suffocation, (9) starvation, and (10) blunt force trauma? Which of these methods of rodent execution...
  7. hevans1944

    Hello from Beautiful Greenfield Indiana!

    @K9WG: Welcome to Electronics Point, Richard, from AC8NS! The "NS" in my call apparently means "No Station" as I am without an antenna since moving to Florida in December 2016. I got my Novice license (call KN8UTJ) in 1966 while serving in the U.S. Air Force and stationed at Kincheloe AFB, MI...
  8. hevans1944

    Help with a project idea

    I am concerned. LEDs are usually soldered in series with current-limiting resistors, almost never in parallel. I say almost because there may be some legitimate circuit somewhere that, for some legitimate reason, requires a resistor to be soldered in parallel with an LED. I've just never seen...
  9. hevans1944

    DIY Electric Shocking Mouse/Rat Trap

    I have seen several videos of the rolling barrel trap, and some have shown lots of mice that have drowned overnight in perhaps ten inches or so of water. Deep enough so their little legs can't touch the bottom of the bucket in preparation for an upward leap outward. So, pee or no pee, a hungry...
  10. hevans1944

    Superimposing Low Frequency Dither over High Frequency PWM

    Cost always enters the equation! It just gets "kicked down the road" by issuing fiat currency and selling "war bonds," but it is always a major factor in the decision of what gets funded and what doesn't. After WWII, the United States made a conscious "policy decision" to never again be caught...
  11. hevans1944

    Superimposing Low Frequency Dither over High Frequency PWM

    I haven't tried dithering a PWM signal, but amplitude dithering was common with analog servo loops and simply consisted of adding a small (usually sinusoidal) signal to the servo valve control signal. The effectiveness depended on how the servo valve was constructed because that affected the...
  12. hevans1944

    Clarification of terms S:N

    Since all the badges have been eliminated, except for Administrator and Moderator, perhaps @Ian can add a new badge for posters like @tedstruk and @CTP4500 and ...others. Never heard of the term "word salad" until @(*steve*) used it here, but it is funny and apropos. OTOH, many of my posts can...
  13. hevans1944

    Cheap linear actuators

    @Ian says there is only a roof above, no toilet. It could conceal a plumbing vent pipe that exits through the roof and services the sanitary sewer drain of a nearby sink. Rodent secret passage beginning to look more and more likely. @kellys_eye: I, too. like your "most useless machine" idea...
  14. hevans1944

    DIY Electric Shocking Mouse/Rat Trap

    Why didn't the "rolling log/ rolling soda bottle trap" work? Do you have a close-up photo of the device you tried to use? Was there enough water in the bottom of the bucket to ensure drowning? Are your rodents (rats) so large that the are able to jump out of a five-gallon bucket? If so, have you...
  15. hevans1944

    DIY Electric Shocking Mouse/Rat Trap

    What voltages are available in cats? We had a cat that would catch the mouse, play with it for awhile, then bite the head off and present it to us as some form of cat tribute. We never found the body of mice dispatched in this manner, so I suspect the cat ate that part. Must have been like a...
  16. hevans1944

    Cheap linear actuators

    Two things: (1) it's a leap of faith to believe that pipework is concealed behind the drywall corner. It could be electrical wiring, or a structural support, or even a secret passage for house rodents; (2) convex corners, as opposed to normal concave corners, are nice because they may be easier...
  17. hevans1944

    How do I make my own musical instrument?

    Outstanding! I wonder whether or not each sound clip was played on the same instrument by the same player who only varied their playing technique... Well, at least there are samples available to compare against whatever electronic version @goutham gumm comes up with! Thanks for the link.
  18. hevans1944

    How do I make my own musical instrument?

    You should start by making friends with a search engine called Google. Try visiting some of the links on this result page which popped up when I used the search string "electronic percussion instruments." Oh, and by the way, you failed to mention that a Mridangam is basically a double-ended...
  19. hevans1944

    1979 Kenwood Trio Tuner Bulb

    Yes. It will be somewhat brighter because of the increased current. This type of bulb is designed to plug into a socket, but you can carefully straighten out the wire leads and solder them to your existing insulated wire leads. When straightening out the leads, grip them close to the glass...
  20. hevans1944

    1979 Kenwood Trio Tuner Bulb

    I couldn't find an exact replacement either. Sometimes when "repairing" ancient electronics you have to make compromises. You may be able to solder the insulated hook-up wires, shown crimped to the original lamp, to a replacement lamp that has a base attached to the lamp filament wires...
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