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  1. Replies
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    18,029

    Nerve, have you got a link or part number for...

    Nerve, have you got a link or part number for that flip-up LCD housing? I assume it isn't motorised? I don't have factory fitted navigation in my RX-8, how much effort was involved in taking the dash...
  2. Replies
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    3,352

    The circuit is described is not really a 'dumb'...

    The circuit is described is not really a 'dumb' charging system. The system would detect the current draw from the batteries during charging, and then they are almost fully charged the current would...
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    3,352

    Don't see that many of them with internal PSU's...

    Don't see that many of them with internal PSU's any more. Why exactly do you need the laptop battery in there when you are tapping into the contacts? I've probably missed exactly what you are trying...
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    3,352

    Digitallexus is 100% correct about the Ah rating....

    Digitallexus is 100% correct about the Ah rating. As for trickle charging, there is no reason you can't do it on a Ni-Mh battery. Just remember that trickle charge should have a charge rate of C/100,...
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    1,708

    Well I found the part number. It's WM8816EDW and...

    Well I found the part number. It's WM8816EDW and it's made by a company called 'Wolfson'. You can get it from www.rapidelectronics.co.uk (not sure if they sell outside the UK) under order number...
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    864

    ISR's in the UK

    Looking for a UK supplier of ISR's but can't seem to find one. Does anyone know of a good supplier in the UK of these components? It's nothing urgent but I would appreciate the help.

    Best regards,...
  7. Replies
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    1,708

    Digital pot. should work, but there are also...

    Digital pot. should work, but there are also proper IC's out there designed specifically for audio. You might find they are higher quality or have extra features at around the same price. I don't...
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    Probably cheaper to buy an inverter. A UPS is...

    Probably cheaper to buy an inverter. A UPS is also normally only designed to run for a short time, so you may get problems there.

    Best regards,
    Matthew
  9. Replies
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    3,121

    Depending on what AP you have, it might be...

    Depending on what AP you have, it might be possible to attach an external arial on the outside of your house.

    Best regards,
    Matthew
  10. Replies
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    1,594

    If you can get a supply to the circuit that is...

    If you can get a supply to the circuit that is constantly on, you can easily do it with a transistor, capacitor, and a few other bits. I have attached a circuit you could use, although I drew it out...
  11. If you don't draw more than 250w from the...

    If you don't draw more than 250w from the inverter that switch will be fine. You could use a relay if you need a higher current, but that's just making things more complicated.

    Best regards,
    ...
  12. Replies
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    There are plenty of 4 pole double throw switches...

    There are plenty of 4 pole double throw switches out there, you might simply consider one of those.

    Best regards,
    Matthew
  13. Just a little on cat5 cable, two main types are...

    Just a little on cat5 cable, two main types are available, UTP and STP. Unshielded Twister pair is what UTP stands for, and from that you can guess STP. Also, I have seen 10 pair before with a...
  14. Possibly picking up stray signals from somewhere?...

    Possibly picking up stray signals from somewhere? Would explain why cat5 works, you have twisted pairs to reduce EMI.
    Best regards,
    Matthew
  15. PIC's and STAMPS are both similar, although I...

    PIC's and STAMPS are both similar, although I don't know a large amount about STAMPS. They are both microcontroller devices programmed from a computer. I am only new to Microcontrollers, but i'm...
  16. Sorry, my mistake. I didn't really check over the...

    Sorry, my mistake. I didn't really check over the circuit properly and just assumed the cap was directly across the first relays coil. Guess we all make stupid mistakes sometimes! Great circuit...
  17. I'm not too sure that would do what is needed. ...

    I'm not too sure that would do what is needed. Cpro wanted a circuit that would shorten an input pulse. Jake wanted a circuit to simulate a keypress when the cars ignition was turned off. Your...
  18. Replies
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    1,247

    Very very unlikely if you are using a suitable...

    Very very unlikely if you are using a suitable charger.
    Best regards,
    Matthew
  19. Replies
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    I have put voltage regulators in parallel before....

    I have put voltage regulators in parallel before. I know that I shouldn't do, but in practice it always seems to work fine.
    Best regards,
    Matthew
  20. I would think a relay is a better idea so that...

    I would think a relay is a better idea so that you don't pick up any stray signals on a long length of wire.
    Best regards,
    Matthew
  21. I can't be entirely sure but I imagine you need...

    I can't be entirely sure but I imagine you need to have split mode turned on. A 4x40 LCD contains two drivers, rather than the usual single driver. Give it a try as jarrod said.
    Best regards,
    ...
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    Put 2200uF capacitors before the regulator and...

    Put 2200uF capacitors before the regulator and perhaps some smaller capacitors (10uF) after the regulator. The LM7812 is rated at 1A but you can put more of them in parallel for higher current.
    Best...
  23. Replies
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    A large capacitor(s) and a LM7812 regulator...

    A large capacitor(s) and a LM7812 regulator should make a good enough smoothing circuit. Try perhaps a few 2200uF capacitors in parallel, make sure they are rated at 25v minimum. Don't worry about...
  24. Just to further what everyone else has already...

    Just to further what everyone else has already said, a fuse on the - side is pointless unless your cars electrical system doesn't have any fuses. Since I haven't seen any cars like this, no fuses on...
  25. It's best to have a couple of fuses, but if you...

    It's best to have a couple of fuses, but if you put your fuse right next to the battery there is little chance of a short before the fuse. Since current flows in a full circle around the circuit, one...
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