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  1. (*steve*)

    5v/12vdc inputs and only one of those as outputs using PIC18fxxxx

    Here is the circuit: D2 is optional. If the 12V supply will always be available when the 5V supply is available, D2 can be omitted. Q2 is any small general purpose NPN transistor. Q1 is a P Channel mosfet with Vgs(max) > 12V (20V is common, so this is not a huge issue). D1 and D2 are...
  2. (*steve*)

    Special Led Chip Array With Step Down Converters.

    What sort of dope do you think I am?
  3. (*steve*)

    How to remove solder from plated-through holes?

    Do you have access to a solder pot?
  4. (*steve*)

    5v/12vdc inputs and only one of those as outputs using PIC18fxxxx

    There's plenty of things, but in your case it can be done in a way which doesn't risk the device being depowered or the rails being shorted during switching. The first of these problems may not be an issue in your case, but the second can be an issue using semiconductors as switching elements...
  5. (*steve*)

    Need help finding the right resistor

    No, just like putting tyres with a higher speed rating on your car doesn't make you go faster, placing a capacitor in a circuit that can withstand a higher voltage won't make that voltage magically appear.
  6. (*steve*)

    Need help finding the right resistor

    As I said, 10v or higher
  7. (*steve*)

    5v/12vdc inputs and only one of those as outputs using PIC18fxxxx

    Use a p channel mosfet to switch the 12V then use schottky diodes to OR this and the 5V together. Your mosfet will require a resistor from gate to source and be switched by an open collector output unless your IC is powered from 12v or more.
  8. (*steve*)

    Need help finding the right resistor

    It's hard to tell what voltage rating is required but it is likely to be fairly small. 10V or anything higher would likely be very safe.
  9. (*steve*)

    Need a dummy load

    Just to be sure we're talking about the same thing... They are mains voltage LED bulbs, not individual LEDs, right?
  10. (*steve*)

    Difference in battery capacity between Alkaline and NiMH cells

    Lipo are more common these days. NiMH are harder to charge (you really need a dedicated charger) But if you've got them and have a charger...
  11. (*steve*)

    Unknown components on this circuit board please help

    My guess is that they are IRF7530, a dual N channel mosfet.
  12. (*steve*)

    Need a dummy load

    I'd ensure there is an on/off switch. The dimmer not reducing the brightness to zero is a good indication that the lights are on. If the dimmest setting is too bright, get a better dimmer. Placing a resistor across a LED is an option for a single low current device, not for a mains operated...
  13. (*steve*)

    Hi everybody

    You are now officially checked in!
  14. (*steve*)

    Parallel and series generator and batteries

    How many miles do you need to drive to get 40 miles per hour? You need to learn the difference between A and Ah. One is a measure of current (A), the other of capacity (Ah). The battery might like a 1.5A charge rate, but I don't know. See the spec sheet. Abbreviated details are sometimes...
  15. (*steve*)

    Winco generator not producing electricity

    I was thinking exactly the same thing
  16. (*steve*)

    Difference in battery capacity between Alkaline and NiMH cells

    Just use the mAh values. If you have an unusual situation where discharge is way above or below a 20 hour rate, check the datasheets. Practically you'll also need to know the minimum voltage requirement for the load too. A simple option is to run some tests and find out the actual life.
  17. (*steve*)

    Parallel and series generator and batteries

    12A charge current for a 12Ah battery is waaaaaay too much, especially if it is an SLA battery.
  18. (*steve*)

    how can it get ac drive experiance repair

    I don't know what you're talking about.
  19. (*steve*)

    Difference in battery capacity between Alkaline and NiMH cells

    Secondary cells are typically larger and heavier than primary cells of an equivalent capacity. For one thing they don't have to be built to last longer than a single discharge. For another thing they don't have to include vents or other safety features to prevent explosive damage if...
  20. (*steve*)

    Winco generator not producing electricity

    There was no resolution in that thread. https://www.electronicspoint.com/threads/generac-gp5500-3volts-coming-out-of-outlets.280702/#post-1708472
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