Search results

Search Forums New Posts
  1. (*steve*)

    Capacitor charging itself?

    Wow, LEDs rated at 20 MegaAmps, a 55MegaHenry inductor, Did you give at least 2 answers to Q3? How many nΩ did you calculate for Q4? Did Q5, 8, 9, and 10 all have pretty much the same answer? How long an arc did you estimate you'd pull in Q7? What language does your teacher speak?
  2. (*steve*)

    Capacitor charging itself?

    Potential difference? But that would make it a power source. My first thought was dielectric absorbtion, but that doesn't fit the question either.
  3. (*steve*)

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

    I'm not sure a caveman could do it, but I have faith in your abilities. The controller is rated for 24 volts, so the input connections can be connected to your 24V supply. The two 12V strips (which are now connected to allow their operation from 24V) can be connected to the output...
  4. (*steve*)

    Paradox MG5050 - Open Zones

    Had somebody cut the wires?
  5. (*steve*)

    CO2 laser tube lifespan - time used vs age of tube?

    It's a relatively cheap ($2k) laser tube that is fully sealed with no user serviceable parts inside :-( I believe there gas leaked out via the water jacket. We'd have to open that up, fix the hole, and somehow close up the glass envelope again. I'll have to refresh my mind about where all the...
  6. (*steve*)

    Sewing machine power supply/capacitor blown up

    Given that you know the series, if you measure the dimensions of the cap you can probably narrow down there possible range of values.
  7. (*steve*)

    Fulham Led driver issue

    I'm having some trouble understanding your question. Are you saying that you can measure 17V across the input? And in this state (with nothing else connected) the light is off? I don't understand your second question at all.
  8. (*steve*)

    Measuring battery voltage with an MCU while charging and discharging

    How about you read everything that's been said and take some time to develop a circuit that takes all of this stuff into account?
  9. (*steve*)

    Anyone can explain three types of LED tube?

    Are you talking about replacement flurescent tubes? Type A generally "just work" by replacing an old tube. There may still be some losses in the ballast which remains in circuit. Type B have internal drivers and are simply powered from line voltage. Type C have their own external driver...
  10. (*steve*)

    Measuring battery voltage with an MCU while charging and discharging

    Well it's missing the mystery 4 rail power supply for one thing. And your mystery 4 rail power supply doesn't indicate what powers it. And you don't show the batteries with their external connections. And you don't show the chargers. They are just the obvious things. Do you want me to look...
  11. (*steve*)

    Hi everyone

    Hi and welcome to Electronics Point
  12. (*steve*)

    Transistor and multimeter current

    If you're lucky you haven't damaged anything. You can't measure amps the same way you measure volts. It sounds like you have made the newbie mistake which often damages meters and destroys equipment.
  13. (*steve*)

    What's the working principle of this inverter circuit ?

    Yes. The red X marks the point at which the missing image is located in your post. Either post the actual image here or a link to the website page. Even better, do both! Edit: was there an old version without the link?
  14. (*steve*)

    Capacitor test on a tube amplifier

    Please upload an image showing the leakage. If it is leakage if replace the capacitor. I would also replace other capacitor of the same type -- that would be all 5 of them there. How old is this amplifier?
  15. (*steve*)

    Measuring battery voltage with an MCU while charging and discharging

    No you can't do that because then the two power supplies wouldn't be isolated, would they? And that circuit which you claim to be the entire circuit isn't. Oh my god you're doing my head in!!!
  16. (*steve*)

    Measuring battery voltage with an MCU while charging and discharging

    I agree. This project send to be something you can't do. Why not start with something simpler as you learn electronics? I not that you edited a post above to add information about the chargers, but you still haven't done the test to confirm that they have floating outputs. Do you have a...
  17. (*steve*)

    Measuring battery voltage with an MCU while charging and discharging

    Very nice, but can you answer the question?
  18. (*steve*)

    Capacitor test on a tube amplifier

    It depends on what the capacitor is used for. If it is in the signal path, connected to the grid of some poor valve and is leaky then placing another cap in parallel won't fix the changes in biasibg the leakage causes. If it's just noisy, a cap in parallel might reduce the noise, but it won't...
  19. (*steve*)

    Measuring battery voltage with an MCU while charging and discharging

    Why are there 4 power rails? And where do they come from? I assume (hope) 12V and 24V power raiks are not used to charge the batteries.
  20. (*steve*)

    Measuring battery voltage with an MCU while charging and discharging

    The other (simple) way is to have a completely independent power source for the MCU. This MUST have a separate (i.e. not connected) ground. In the diagram they are shown in different colours. For simplicity I've shown relays being used, but you could do this in other ways. Note that with...
Top