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  1. Martaine2005

    Adding capacitor to wireless power transfer circuit. Need guidance.

    The capacitor can if you over volt it or get it’s polarity wrong..But this is probably not what you mean or want!:p Martin
  2. Martaine2005

    Help identify power components

    Yes, you are correct. I wanted to make sure you understood that the common is very important here. Common and -12V = negative 12V. Common and +12V = positive 12V. If you only used -12V and +12v you would have 24V. AAs are 1.5V not 3V. So 8x1.5=12. Martin
  3. Martaine2005

    Help identify power components

    Not quite. That will be 24V. You forgot the 0V centre connection. But I think you understand. Martin
  4. Martaine2005

    using USB-C as a passive bus

    This file has all the connections. Martin
  5. Martaine2005

    using USB-C as a passive bus

    The USB-C is 24 pins. But has 12 pins per side wired diagonally opposite for inserting the plug either way. Well, the Vbus and Grnd are about 4 each so reality is 16 pins, 8 per side. Not a good idea for any other use unless you too wire it for connection either way round. Martin
  6. Martaine2005

    NOW HEAR THIS . . . .NOW HEAR THIS . . . . . ALL POINTS BULLETIN

    I often think about him too. Hopefully he is OK and just taking a break. @duke37 where are you? Martin
  7. Martaine2005

    LED Light Flicker Load Correction Device

    I had the same problem as do many others. I tried several different ways. I got lucky in my living room by adding a neon indicator lamp and hiding it under the fitting. In multi-light fittings, replace one LED bulb with an incandescent bulb. Although this works fine, it’s not the point. I’ve...
  8. Martaine2005

    mA meter 1 day build

    Hi Bob (with a sidecar), Maths is by far my worst enemy, which is why I failed my City & Guilds exam years ago. Trying to work out your calculations doesn’t help me at all. Is the resistor you used 47kΩ or 4.7kΩ? (Lower case k). You wrote 47KΩ (capital K) and then 4700Ω. Either way, I still get...
  9. Martaine2005

    Simple Wiring Question

    :p:p:cool:
  10. Martaine2005

    Help identify power components

    I think the techy term is multiple windings transformer. Or centre tapped transformer. Search these terms and you’ll find plenty. Although these are transformers and not SMPS. Martin
  11. Martaine2005

    Need to revise, nothing entering my brain

    As I said in one of your other threads, you know what you need to do. You know what mistakes you made. Learn by them and look forward to a future without the same mistakes. Asking about yoga is useless. Every single person on the planet learn and understand in their own way. Some smoke a...
  12. Martaine2005

    plz suggest replacement for rifa safety capacitor

    Hi and sorry for no reply. My internet was down. Yes, that’s fine. But I’m sure that you’ve already got it sorted by now. Martin
  13. Martaine2005

    The best brands of drivers for LED lights

    Oh ok, street lights. Assuming these? Martin
  14. Martaine2005

    Removed buzzer, space heater not working now.

    @bertus read post #3. Martin
  15. Martaine2005

    Removed buzzer, space heater not working now.

    To the left of R5 is the capacitor connections. It looks like the capacitors negative solder pad may be lifted. You’ll need to verify this with a continuity test. Test all the other areas you touched too. Martin
  16. Martaine2005

    The best brands of drivers for LED lights

    What’s a LED street driver?. Martin
  17. Martaine2005

    Anyone know what this is?

    Alibaba sell them. It’s for an exercise bike and or gym equipment. Martin
  18. Martaine2005

    synchronization

    What is it that you don’t understand?. Thread synchronisation simply means one after another in an orderly manner. The others, 2nd, 3rd, 4th wait for their turn. 1st process calls for data or instructions while 2nd and 3rd process waits. Then 2nd process calls for data or instructions while 3rd...
  19. Martaine2005

    Simple door bell (not wireless). New door bell light works, sound doesn't

    I agree. More details please. You say that you crossed (shorted) the wires and both bell and light worked. It can only be the push button. Unless there is a circuit inside the button housing?. You then said that you tried a new push button. Didn’t work but did when you shorted the wires. Unless...
  20. Martaine2005

    Help needed to identify a component.

    Unfortunately, I don’t have any Pavillion schematics. All the HP documents are Compaq related like Presarios. I will add that so many PDFs are incorrectly named and the board view is the only way to sort and correctly name them. Don’t give up though, you could always buy a damaged Pavillion...
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