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  1. (*steve*)

    Measuring battery voltage with an MCU while charging and discharging

    Here is the simplest way: If you use 2 ADC ports then you can either simultaneously read them both, or read them one after the other VERY quickly. This will give you the bottom battery voltage and the total battery voltage . Subtracting the bottom battery voltage from the total battery...
  2. (*steve*)

    Potentiometer replacement

    Yeah, you could do that, but you would need to insulate them. Also, if the connections are being made with shielded wire you would be wise to use shielded wire to connect to the new pots.
  3. (*steve*)

    Connect 12V LEDs to 2 12V car deep cycle batteries

    Do it like this: If you want to connect another pair of lights wire them the same way and attatch them to the batteries too.
  4. (*steve*)

    Potentiometer replacement

    No, you need to remove the wires from the original pots and move then to the new ones.
  5. (*steve*)

    Measuring battery voltage with an MCU while charging and discharging

    I'll try to draw something up later
  6. (*steve*)

    Measuring battery voltage with an MCU while charging and discharging

    No, that won't work.
  7. (*steve*)

    Measuring battery voltage with an MCU while charging and discharging

    Subtraction is a mathematical operation which has been proven effective over many years as a method of getting the difference between two values. You need to take the readings as close as possible to simultaneously so there is the smallest chance that the voltage across the batteries will...
  8. (*steve*)

    Measuring battery voltage with an MCU while charging and discharging

    Awful for more reasons than I can probably fit into a single reply. You're powering the relays from different batteries leading to the need for a much higher voltage being needed to switch one transistor than the other. A side effect of the same thing is that you would likely have the base...
  9. (*steve*)

    Fluke 199B Scopemeter Repair

    Do you have one of these with a similar fault? I guess the result of the last one was bad news.
  10. (*steve*)

    Swapping magjack/ethernet port on PC motherboards

    My comment about the motherboard fallen off was based on the fact that you were asked for close up views of the actual motherboard and you showed us what I believe is a stock photo of the connector. And as you rightfully point out the next images are pretty useless too.
  11. (*steve*)

    Touchscreen Digital mini calculator integration in Fountain pen.

    Could we have a pen with a real fountain built in. Maybe with a bird bath?
  12. (*steve*)

    Digital multimeter with room temperature detection.

    And many also have an integrated temperature sensor which can read the ambient temperature. However I have never seen a multimeter with a built in cuckcoo clock.
  13. (*steve*)

    Swapping magjack/ethernet port on PC motherboards

    If yours looks like that one then the problem is that the motherboard has fallen off it. If you have actual photos of your motherboard then please upload them here. Don't point is to another site.
  14. (*steve*)

    Connect 12V LEDs to 2 12V car deep cycle batteries

    No that's dreadfully wrong. Please wait until I (or someone else) can draw you a picture.
  15. (*steve*)

    Touchscreen Digital Multimeter Product.

    And it's what the prices are measuring that's most important It's like the camera on that scalpel is recording the surgeon's face rather than what the scalpel is cutting.
  16. (*steve*)

    Touchscreen Digital Multimeter Product.

    Well, if you want to read your multimeter from a long way away...
  17. (*steve*)

    Measuring battery voltage with an MCU while charging and discharging

    Obviously you need 2 ADC pins for that circuit, and the common ground is the because of the bottom battery. Both voltage dividers present approx 1/10 of the voltage to the ADC. I'm not sure why you used different value resistors. You can calculate the voltage on the bottom battery, and the...
  18. (*steve*)

    Connect 12V LEDs to 2 12V car deep cycle batteries

    If you connect the - of light 1 to the + of light 2, then you can connect the + of light 1 and the - of light 2 up to 24 volts.
  19. (*steve*)

    Maximum value of Potentiometer.

    The question still doesn't make any sense. For the maximum volume the amount of resistance between your amplifier and your speakers should be ZERO.
  20. (*steve*)

    Connect 12V LEDs to 2 12V car deep cycle batteries

    That will be fine with respect to the voltage delivered to the strip, however if these batteries are charged in series, you need to keep the load on each battery as close as possible to the same. If the LED strips are identical and use resistors to limit current, you can connect pairs of these...
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