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  1. Martaine2005

    Modding a lamp

    Yes, Edd is very thorough. First tell me the things you don’t understand. But in the meantime, a 30 Ohm resistor will supply approximately 10mA to the LEDs from your 3xAA (4.5V) batteries. Assuming 2.1 Vf . You can of course use a higher value for less illumination and a little lower for more...
  2. Martaine2005

    Modding a lamp

  3. Martaine2005

    Modding a lamp

    Simply put, but I’ll update this thread tonight. Positive + from batteries to switch. Then from switch to a resistor and then to the LEDs. The last wire from LED cathode (negative -) goes direct to the negative - of the batteries. Martin
  4. Martaine2005

    Modding a lamp

    Ok, I have an idea of what’s going on. Your easiest solution is to wire the batteries through the switch and add a current limiting resistor to the two LEDs. 1 resistor is all that you require. You can leave the original board in in case you want it later.
  5. Martaine2005

    Modding a lamp

    Yes that board is a constant current supply, ideal for LEDs. But if you can’t get to the LEDs, how will you wire it?. I will read through this thread again to see what’s what and see what’s easiest to do. Yes, you will need a soldering iron and solder!. Martin
  6. Martaine2005

    Modding a lamp

    Hey, why mess around converting the PCB? Why not just put a 5V LED strip, cut to whatever length you require and use a 5V power adapter?. Or individual LEDs of course. Martin
  7. Martaine2005

    Rumble 150 power problems

    That’s a great picture. I’ll keep that and probably use it on the forum at some point. Martin
  8. Martaine2005

    6A 250V US Plug security camera wiring problem

    You would require a 12V DC adapter with a current rating of 2A to match the existing power supply. Martin
  9. Martaine2005

    6A 250V US Plug security camera wiring problem

    Perhaps have a look on YouTube for a video showing how to do it maybe helpful. But simply put, you have two wires to strip exposing the inner copper wire strands. Twist these by hand so a neat small length of twisted strands can each be located and tightened into the plug locations for Live...
  10. Martaine2005

    6A 250V US Plug security camera wiring problem

    Hi, any plug will do. Are you sure that a strand of wire didn’t short it out? BTW, it’s a SMPS accepting 100V through 240V and 0.6A (600mA). Martin
  11. Martaine2005

    Rumble 150 power problems

    I believe the OP was referring to a current limiting bulb. But I never got an answer as to what bulb he was using. Martin
  12. Martaine2005

    Icom 260A memory back up battery issue

    And to add to the above that of @kellys_eye , the memory switch on the back will have to be in the ‘on’ position. People have simply rewired the memory switch to be the power switch but obviously only works when connected to constant power. Martin
  13. Martaine2005

    USB Charger and Buck converter

    I wouldn’t believe the 2A rating unless they are a good name brand. Have you got anything that you can use to load test them?. Try using more LEDs to load them and see what current is drawn before it shuts down. Martin
  14. Martaine2005

    USB Charger and Buck converter

    What is the current rating of your USB chargers? If they’re old stock, they might only be 500mA which means they’re overloaded. The fact that a wall wart and bench PSU work also confirms this. Edit: why not put another LED in circuit so the voltage required is higher?. Then a smaller value...
  15. Martaine2005

    One Way Or Another.

    So it seems a micro then. Look up H bridge circuit or buy a cheap controller. Martin
  16. Martaine2005

    Project that was working, but then stopped

    That pot and transistor idea is direct from another continent that swamps YouTube. Martin
  17. Martaine2005

    Watts wrong?

    Taking the backs off is usually a maximum of four screws. It’s worth a look inside as it could be very easy to fix. The rotary switch is another animal. Some have ball bearings that fall out at their earliest opportunity. If in doubt, take lots of photos as you go. Martin
  18. Martaine2005

    One Way Or Another.

    How many wires went to the controller? 2, 3 or 4? Martin
  19. Martaine2005

    One Way Or Another.

    Did you get a controller with them? Some are thyristor controlled and others are micro controller. The thyristor controlled lights can easily be circumvented with a bridge rectifier. The micro controller is more complex but can be done with an H bridge. Martin
  20. Martaine2005

    Watts wrong?

    Some meters have springs inside to connect the piezo. It’s not uncommon for those to need a good clean. Others, the wires come loose from taking the backs off for battery and fuse changing. But all 4 meters of different types?, I’d get your hearing checked:) no joke, I can hear only two of mine...
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