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  1. Martaine2005

    LED device Help please !

    Erm, can you give the FULL details of the regulator, battery and charger? And a drawing of how you intend to connect it all? Normally one would buy a charger for the required battery. Making one can get very complicated and if not done correctly, potentially very dangerous too!. Martin
  2. Martaine2005

    Voltage sensor 10-15v

    Hello, One of these modules should do the trick...There are hundreds on Ebay... http://www.emartee.com/product/42082/ Martin
  3. Martaine2005

    How can I hook up my usb speakers to a battery pack?

    Lol Chris, I think it's a double chinned smiley! I can only assume he used a higher voltage source. Martin
  4. Martaine2005

    LED device Help please !

    Yes, keeping the charging circuit separate. Glad you only needed 7 leds but 8 works better!!:D Martin
  5. Martaine2005

    LED device Help please !

    You'll only need one resistor per string. The switch would normally go after the battery to turn the whole circuit off. Martin
  6. Martaine2005

    LED device Help please !

    Hi Andreas, wiring in the 3 and 4 series configuration would appear to be most efficient. About 40ma. But using 8 leds would mean the same resistors and still about 40ma. You could just leave the 8th led connected inside the box and not visible. The calculator says 56Ω, but below 100Ω is not a...
  7. Martaine2005

    A true novice needs help, electronic game trail alert

    Hi Jab, Wow, talk about jump in the deep end... There are already trail cams available. You could use the same frequency for all as only one will be activated at a time (hopefully). Then you'll also get to see what triggered it and whether to shoot with camera or other:p. Also needed will be...
  8. Martaine2005

    LED device Help please !

    Hi Andreas, What leds are they? 330Ω would be reasonable for a single led from 9 volt. The best way is probably series strings of 3 and 4 leds. But the leds specifications would confirm the best resistors. Martin
  9. Martaine2005

    LED power supply help

    Very nicely done!! There are some other Chinese lighting circuits that use a third wire the same length as the string acting as the resistor. But safety is not there concern!!! Always the cheapest way!. I bet the bean counters are highly paid though.. Martin
  10. Martaine2005

    LED power supply help

    Hi Ian, As you can see, there are many ways to skin a cat! Just a little question regarding your last post. Did you wire both circuits to the 13.2v at the same time? Is a single circuit to your adapter any brighter? (one - and the +). If not a regulator would be the simple answer as suggested...
  11. Martaine2005

    Help! Arduino based car not working when touching ground.

    https://en.wikipedia.org/wiki/Ground_bounce Martin
  12. Martaine2005

    Sony reel to reel tape recorder inquiry

  13. Martaine2005

    How can I hook up my usb speakers to a battery pack?

    Got to start somewhere Uncle Chris! And he just learned something! That 5v and 1.5v are very different:D Marty
  14. Martaine2005

    Sony reel to reel tape recorder inquiry

    Yes, I found that too. Here is the side view. Martin
  15. Martaine2005

    Help with a wiring circuit

    And I thought you only "munchied" on 'grapes' Uncle Chris..:p Marty
  16. Martaine2005

    Microphone inside car.

    Hey John, be careful! I have Uncle Chris looking after me....:D Marty
  17. Martaine2005

    Simple stall over current 12v dc motor protection?

    Aww, uncle Chris, thank you. I think the reason I noticed that was because I wasn't on the "grapes"! Still plenty of time though!:p Marty
  18. Martaine2005

    Regulate from 12v to 3v?

    Oops, oh yes... Still be fun to go down the street flashing.........huh........:cool: Martin
  19. Martaine2005

    LED power supply help

    Hi Ian, Steve has a good point. A 555 with a 4017 will work great too. Simply just on and off. The CD4017 has ten outputs. So with a little imagination and a few diodes, you can get some pretty good flashing patterns. Or simply use just two outputs.. Here is a basic schematic below. The second...
  20. Martaine2005

    LED power supply help

    Hi Ian, I never thought of that.:eek: I think the 555 is about 16v or 18v max. Still, you have already dropped the the voltage by two diodes of about 1.5v. It would be easier to use something like a 12v mains adapter from any old item laying around the house. Don't forget you'll only be using...
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