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  1. hevans1944

    Technique Question

    Since the late 1960s I have used 30 AWG wire-wrap wire, hand-wrapped one or two turns around socket pins that have been tack-soldered to the prototyping board. I always uses DIP sockets when prototyping ICs in Dual Inline Packages (DIPs), either solder-tail or wire-wrap types, depending on what...
  2. hevans1944

    IR IMAGING DEVICE on the cheap

    The silicon camera sensor (probably a CCD) will have it's peak sensitivity at about 0.9μm or 900nm wavelength. This IS close to the high frequency end of the near-infrared spectrum, if we define that as the lower wavelength limit of human visual perception. This varies from person to person...
  3. hevans1944

    Detecting horizontal position

    Thanks for the video @Bluejets! What a neat way to program the ATtiny85/45 microprocessor! Just about everyone who plays with micros has an Arduino UNO on hand and a solderless breadboard, so no need to buy a PIC programming pod like I use for Microchip PIC micros. After I download the datasheet...
  4. hevans1944

    Coronavirus transmission prevention device.

    The US has been slow to respond to the novel coronavirus. It now appears that self-isolation is the ONLY protocol that actually slows the spread of COVID-19 (COronaVIrus Disease-2019). If infected and death occurs, it is usually a result of acute respiratory failure with pneumonia symptoms...
  5. hevans1944

    Detecting horizontal position

    1) Only time will tell. 2)Follow @Bluejets advice and separate sensor from module. 3)Probably; try it and see if it still works. 4)No; a switch (by definition) is a binary device, either open or closed. More information here on the SW520D "ball in cylinder" tilt switch/sensor. There are tilt...
  6. hevans1944

    does anyone understand microphone wiring

    I like the explanations about faulty switch contacts not fully shorting the output of the microphone. But where does the delay "over a period of a few seconds" between operating the switch and input fading away occur? The fact that cranking up the volume on your amplifier while shouting into the...
  7. hevans1944

    Dual DC motor wiring help

    Woah! We know exactly zip, nothing, nada about this kiddie car nor its putative driver. The OP needs to provide some more details, like the length of the wheel-base, the un-sprung weight of the vehicle, the turning radius, the type of braking employed and how far the vehicle will travel if...
  8. hevans1944

    Dual DC motor wiring help

    My kids are all grown-up adults now, but when they and I were younger, the company I was working for was discarding a bunch of obsolete computer peripherals. This included a 9" reel-to-reel tape drive with vacuum columns, which allowed the tape to move really fast between the reels. Like, warp...
  9. hevans1944

    Detecting horizontal position

    Did you try Google with this search string: tilt sensor? Lots of results here. I bought a bag of a hundred ball-in-cylinder tilt sensors from Amazon recently, with the idea of throwing together a "toilet seat up" warning for my wife. If the toilet seat is up, the ball makes contact between two...
  10. hevans1944

    Dual DC motor wiring help

    It appears to make sense to me. And it appears to be correct, too. I wonder if the two 30,000 rpm motors are geared down enough to safely propel your son around the commons, or perhaps inside your home on carpeted floors? Do you have chargers for your two batteries? Will the speed controller...
  11. hevans1944

    Solenoid Motor Strength

    Amazing! A motor-powered raft for cruising around on a pond! Huckleberry Finn and Tom Sawyer would be proud of ya! However, if some of us here are gonna help get your project in the water, you need to provide more details and mebbe some pictures of your pond and your raft. How big is your raft...
  12. hevans1944

    Phase Shift Oscillator Puzzle

    @ShawnS: Welcome to ElectronicsPoint! We DO cater to newbies here, so feel free to ask lots of questions. The better you can describe what you want to DO, the better the advice you will receive. A lot of folks come here with some idea of how they want to DO something, but if they are...
  13. hevans1944

    Sciaky model C.R.O.I. what is it?

    The red replacement looks like a 5-way binding post.
  14. hevans1944

    Sciaky model C.R.O.I. what is it?

    I think you should try to replace those "insect hotels" with common red and black, chassis-mount, banana jacks, NOT "safety" banana sockets, NOT BNC socket(s), and NOT five-way binding posts. Also avoid the temptation to replace the valves with transistors of any species, including any included...
  15. hevans1944

    TDA2030a Amplifier I.C. Specs

    I am pretty sure they were all "calibrated" to sell vacuum tubes. After I spent big bux to buy a Magnavox color TV in the late 1960s, touted as "fine furniture" by the snake-oil salesman in the Rike's department store, the first thing I did was to purchase a complete set of replacement tubes...
  16. hevans1944

    Circuit Soldering question

    I am guessing you must bathe daily and apply Old Spice aftershave. Well, my wife insists that I do that too, so that I don't smell like an old man. I insist that my old man nose works just fine for smelling, but she insists that I shower and apply scented lotion to my body every day anyway. Of...
  17. hevans1944

    Circuit Soldering question

    Virtually ALL solder used for electronics work has a hollow core filled with flux (some call it rosin, but that is just one type of flux). The solder manufacturers try to include just enough flux per unit length of solder to allow a good solder joint to be made. If you are filling a room with...
  18. hevans1944

    Progress

    @SparkyCal: no need to manufacture a "normal board" when you can buy pre-etched and drilled prototyping circuit boards consisting of parallel traces with holes drilled on a 0.1" spacing grid. These come in all sorts of sizes, some with gold-plated edge contact "fingers" for reliable connections...
  19. hevans1944

    TDA2030a Amplifier I.C. Specs

    Yikes! That sounds expensive! No wonder solid-state won over "hi-fi" from vacuum tubes. Seriously, though, if you stick with tubes that don't have indirectly heated cathodes, just (perhaps) thoriated tungsten filaments, and they don't become "gassy" with age, IMHO they should last waaaay longer...
  20. hevans1944

    TDA2030a Amplifier I.C. Specs

    I have never tried to use the "5-lead" IC audio "power" amplifiers, so it is with great sorrow that I feel that I have missed the last sailing of that boat. All that seems left is a discrete component class a-b design, using either power transistors or beam-power vacuum tubes, the latter with...
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