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  1. Delta Prime

    Solar tracker problem - LED generates variable voltage in the sun picked up by pico ADC

    Yes, you are correct but in my case I have been Shanghaied. :p
  2. Delta Prime

    Solar tracker problem - LED generates variable voltage in the sun picked up by pico ADC

    Could not help myself, apologies. Anyway, As you have just experienced.LEDs are also sensitive to temperature. That is only one of your problems. I'm thinking a comparator along with temperature sensor right next to your LED so we can compensate for the error voltage
  3. Delta Prime

    Solar tracker problem - LED generates variable voltage in the sun picked up by pico ADC

  4. Delta Prime

    Check individual cells of a car battery.

    Wow! Was this all in harbor or when you're out at sea which would be horrible to think about what's your protective gear if any.
  5. Delta Prime

    Solar tracker problem - LED generates variable voltage in the sun picked up by pico ADC

    Photo diode definitely slow enough response for a sundial. I'm thinking photo transistor. For no other reason then an option,perhaps?
  6. Delta Prime

    Deriving formulas for calculating the errors that occur in the measurement circuit with a two-wire and three-wire resistance thermometer scheme

    Shoot... Sorry, this is homework help.Show me your table values. You have to show an effort ,I will help you.
  7. Delta Prime

    Deriving formulas for calculating the errors that occur in the measurement circuit with a two-wire and three-wire resistance thermometer scheme

    Thermometer scheme?? Errors? show me your layout! Thermodynamics of RTD's(Resistance Temperature Detectors). Thermistors are well known. Metallurgy! what alloys are using? Where is your schematic? Differential equations are involved how good is your math. The information you seek may be beyond...
  8. Delta Prime

    Check individual cells of a car battery.

    As a direct result from driving around with a damaged cell in my car battery, was it took out the bridge rectifier of the voltage regulator which cost more than battery itself. The way he went about checking the cells is absolutely crazy and I like that... don't know why.
  9. Delta Prime

    UPS circuit IC

    I just find this intriguing. Before? What happened? why these particular ICS? There must be other components that are faded as well. Were you probing somewhere you should not have been?
  10. Delta Prime

    Door King 1830-01 POTS telephone hum prevents data send/receive.

    I like this guy Definitely.NASA. Need Another Space Astronaut. ;)
  11. Delta Prime

    Check individual cells of a car battery.

    This is more of an observation than anything else.if there is a defect in an individual cell highly explosive hydrogen gas can and does develop, with the scrap metal rods he's increasing the surface area of the cells so hydrogen gas does not build up and explode while he is taking his...
  12. Delta Prime

    Is there a tutorial for how to post a project on this site?

    Hello there. welcome to Maker Pro:)( just kidding ) You've been here longer than I have. "I didn't know as well" :p
  13. Delta Prime

    Door King 1830-01 POTS telephone hum prevents data send/receive.

    Use only as reference please. Shop around.
  14. Delta Prime

    UPS circuit IC

    You said: "very old SENDON 500VA UPS". Any more information model number serial number And it's not this one correct TG500
  15. Delta Prime

    UPS circuit IC

    Let's test that.
  16. Delta Prime

    UPS circuit IC

    That's my intro-Uncertainty Principle! Have you contacted the manufacturer since it's so old they might help you out with the schematic.
  17. Delta Prime

    Door King 1830-01 POTS telephone hum prevents data send/receive.

    Hello there!:) https://gatedepot.com/doorking-1830-142-isolation-transformer
  18. Delta Prime

    Can anybody out there help identify these diodes?

    Very well...Your "plea" is accepted and all is forgiven. The world needs more teachers . Arigato sensei.
  19. Delta Prime

    Bridge rectifier equivalent

    Bridge rectifiers are the workhorse of the circuit they take a lot of abuse and it is a cumulative effect stresses the component over time and eventually as you discovered they fail this is normal. In your case all the parameters are matched! From a design perspective I would say yes. But...
  20. Delta Prime

    Bridge rectifier equivalent

    You are correct. Excellent choice. Apologies...
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