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  1. hevans1944

    what am I

    OMG! You have a dual Dekapot! I am so envious! Be careful not to put too much current through it. We used these to set precision test-set parameters back in the day.
  2. hevans1944

    Record player motor voltages

    Oh, you laugh out loud and think the original designers got it wrong? BSR once made 250,000 turntables per week for a world-wide market. See this Wikipedia article. They also made a large number of turntables that operated on different voltages, including DC. There is a list at this site. The...
  3. hevans1944

    Resistor values.

    The three power transistors derive their forward base-emitter bias from the voltage drop across R1. The three emitter resistors provide negative feedback to help equalize the current in each of the three power transistors. You can "play" with the value of R1 to see what effect that has on the...
  4. hevans1944

    Rotating motor direction

    I became interested in the concept of randomness many years ago while trying to learn about quantum mechanics and the Heisenberg Uncertainty Principle. Albert Einstein didn't believe in randomness, commenting that "God doesn't play dice." Sure God plays dice... and loads 'em too! How else to...
  5. hevans1944

    Reptile Heater Help please

    @Herpgal I admire your courage and determination. I was born in June 1944 and my wife was born in February 1961. Do the math. I have been trying for the past fifteen years to get my wife up to speed on all things involving the maintenance of electrical, plumbing, and possibly electronic so she...
  6. hevans1944

    Rotating motor direction

    You could easily rig up a circuit to start and stop the motor and count the number of times it rotates clockwise and number of times it rotates counter-clockwise when re-started. If the two counts are not substantially the same over a period of days or months or maybe years of operation, then...
  7. hevans1944

    Evaluating operating temperature range

    Oh. Well, never mind then. Hmmm 50C is halfway between freezing and the boiling point of water, right? As you said, "just a warm summer day.":D Are you recovered from the jet lag yet? Are you visiting and poking through your stash? Does it fill a standard shipping container towed about from sea...
  8. hevans1944

    110 VAC timer

    Woo woo! Ain't our Better Half wunnerful? My wife does the same thing! Finds stuff on the world wide web really fast with uncanny accuracy. And that Cramer timer sure beats re-inventing that particular wheel. The price is excellent! Do you have a link for that one? Unless you can find a used or...
  9. hevans1944

    Evaluating operating temperature range

    At the high temperature limit I don't think you want to be in the oven... but commercial bakeries are available with large walk-in, crawl-out ovens you might be able to rent some time on.:rolleyes:
  10. hevans1944

    Measuring the speed of a Frisbee & Boomerang

    I would fit two small transmitters of slightly different crystal-controlled frequencies to opposite outer edges of the Frisbee and try to measure the Doppler shifts. Probably need to do some maths at the receiver on the two Doppler shifted frequencies to get RPM, but you would also have data...
  11. hevans1944

    Evaluating operating temperature range

    No need to wait until you get home to test the upper limit! America has ovens in almost every kitchen: wood-fired, coal-fired, gas-fired, electrically heated, and for outdoor kitchens, solar-heated. Give it a go while you are here.:cool:
  12. hevans1944

    Hello!

    Ditto @davenn 's remarks. Post some questions and some nicely focused, nicely illuminated photos too. We are all here to help.
  13. hevans1944

    Could you attach SLR Lens to a PIR motion sensor?

    James, you may need to think outside the box on this one. If the goal is to trigger your camera when there is movement in a certain area within the field-of-view of the camera, a passive infrared (PIR) sensor is just one solution. True, it does have the advantage of responding only to movement...
  14. hevans1944

    110 VAC timer

    It would help if we knew a little about your electronics capabilities. Do you have a dedicated place to perform construction that will remain undisturbed when you are not there? Have you ever built any electronic circuits requiring soldering of components? Do you have any tools for the task such...
  15. hevans1944

    Which code is this?

    This link may offer more information. The 24x24 dot matrix code may be proprietary to the manufacturer and used for internal inventory control. You may also want to download this PDF paper.
  16. hevans1944

    Change the color of an LED strip to white(without controller)

    Some more information about the LED strip would be helpful... model number, link to a web page where it can be purchased, datasheet... stuff like that. If the LED strip has red, green, and blue LEDs on it, then lighting up all three should give an approximation of white if you stand far enough...
  17. hevans1944

    Help a blind man in electricity

    You could pack the cotton candy down to the density of molasses to make the weight the same while filling the same volume of container... just saying. Anyone besides me and my wife notice how the "standard" one pound can of food is now less than a pound and the cost is either the same or more...
  18. hevans1944

    Help a blind man in electricity

    Good thing we don't use Mason Jars filled with water as a mass standard. "A pint's a pound the world around" may only be true depending on where in the world you happen to be and to which pint you are referring. The current-day English (Great Britain) definition of a pint being 20 ounces lends...
  19. hevans1944

    110 VAC timer

    Since you are already registered here at Electronics Point, would you like some help building your own? It's a simple project.
  20. hevans1944

    Help a blind man in electricity

    Yeah, and you can put symbols inside the triangle symbol to denote analog ground, digital ground, power-line ground, signal ground, antenna ground, Angus beef ground (my favorite)... ad infinitum. Grounds can be very creative. What! I didn't have to do that? What am I gonna do with that eight...
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