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  1. Martaine2005

    help adapting a transformer to battery external laptop battery charger cable

  2. Martaine2005

    help adapting a transformer to battery external laptop battery charger cable

    Hi juntjoo, I am not really sure I quite understood your message. I couldn't see the linked picture. The rectangle box is indeed a smps (switch mode power supply) Or a 'transformer', 'power pack' etc. That has a IEC C7 connector. So all you need is the IEC C7 cable and plug. You probably have...
  3. Martaine2005

    12v rail vs 5v rail computer psu

    Thanks Gryd3. I can assure all the Admins that you will not need 'safety button' . Your all nice. Martin
  4. Martaine2005

    12v rail vs 5v rail computer psu

    Thanks Gryd3,, you made that quite clear. I apologize for opening my (keyboard). In your words, Abruptly' No excuse for a wanting forum user.
  5. Martaine2005

    Dancing Piezo

    Gotta love 'Photonicinduction; He is a Londoner like me , but mad as a hatter. My pic is on his ceiling..
  6. Martaine2005

    12v rail vs 5v rail computer psu

    Hey Kellygoose, sorry I was offline. The point I was making is the 5v rail has more amperage. Hence the slower motor speed. As all have said here already, the drill motor probably draws a considerable amount of current to even start turning.. The above suggestion has some merit too. Some power...
  7. Martaine2005

    12v rail vs 5v rail computer psu

    I thought this forum was to learn to and ask questions? You Colin seem to think this is your playground . 'just do this..just do that' You may very well be correct! But instead of the 'I know best and do it' attitude, Please explain yourself. If you don't want to participate then don't... Do...
  8. Martaine2005

    12v rail vs 5v rail computer psu

    Sorry Colin? A big resistor?
  9. Martaine2005

    12v rail vs 5v rail computer psu

    Hi Adam, you know I love you:rolleyes: The switch does reverse the polarity to the motor. And also includes all the the electron thingy's. too My drills (Dewalt) have exactly that.Plus for forward and negative for backward. I would be back on for why does 5v work and not 12v? I apologise as...
  10. Martaine2005

    12v rail vs 5v rail computer psu

    Never thought of that...Although his chop saw would have gone down, rather fast. Instead of up!
  11. Martaine2005

    12v rail vs 5v rail computer psu

    Hi Kellygoose, I think you answered your own question.. How many amps is the 12v? How many amps is the 5v? Have a read with this link here. Martin
  12. Martaine2005

    Need help selecting a LED Driver

    My friend. This forum has a dedicated resource section for all led questions. You will not find any other forum that explains the basics right through to complex calculations. Head over to the link below and be prepared to be blown away...
  13. Martaine2005

    Basic electronics

    OK, and thanks. I still think the best way is to use a 230v to 12v transformer for the motor. You might have to rectify the DC for the too. Martin
  14. Martaine2005

    12vdc Pulse Timer

    My solution above, also needs a relay on both left and right though..May be a problem for the OP but is extremely simple.. Martin
  15. Martaine2005

    Basic electronics

    Also, is the 12 volt AC or DC?
  16. Martaine2005

    Basic electronics

    Hi Anders Lund, Math, formulas and equations is certainly where I FAIL.. Your math may be correct but probably the wrong approach. (notice probably). It would be better to have a small transformer of 230v to 12v rather than resistors. Is this by any chance for a heated floor element and...
  17. Martaine2005

    USB 5V power from 12V car supply

    Without searching the internet, I have no idea. I don't see any reason why they would not sell them.. But if not, a glass inline would be perfect too. Martin.
  18. Martaine2005

    USB 5V power from 12V car supply

    Yes. But a fast blow fuse. Martin
  19. Martaine2005

    USB 5V power from 12V car supply

    Amps = Watts / Volts 15w / 12v = 1.25amps I doubt if your tablet will even draw an amp. The fuse should be the 'weakest' link to protect the device.
  20. Martaine2005

    USB 5V power from 12V car supply

    Your 12v to 3v adapter probably has a 1a fast blow fuse. Mine has a 1.6a 250v fast blow fuse. Don't worry about 250v, it's just a maximum voltage. It should be located in the 12v end of the adapter like this picture. Where the spring is..
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