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  1. Arouse1973

    Can I replace a fused UK plug with a regular plug?

    The inclusion of a fuse for the UK market is because we have a ring main which has a 32 Amp fuse, that's the only reason I know. If we used a radial circuit in the UK with a 10 Amp MCB then we wouldn't need a fuse in the plug either. At the end of the day it's all about protecting the cable so...
  2. Arouse1973

    Thick or Thin Film Resistors

    Yes you can as long as the product is not used in a high humidity environment as thin films have a greater tendency to absorb moisture. They are a superior resistor over thick film in many ways, but are normally more expensive. Adam
  3. Arouse1973

    Can I replace a fused UK plug with a regular plug?

    If the current rating of the mains cable supplying the equipment is less than the fuse rating that is fitted at the distribution panel then a separate fuse is recommended because other wise the cable could overloaded. This is why in the UK we have fuses in plugs, because we have the ring main...
  4. Arouse1973

    Capacitor?

    Oh my... you didn't just cut into it, you cut it in half lol :) I don't think you are going to be able to tell what capacitor that is from the damage that has been done. Adam
  5. Arouse1973

    Circuit Designing Software

    Sometimes you have to design the component yourself. Although a lot of the free versions and the very expensive versions have many parts they can't cater for everyone. DIPTRACE has a large selection and I have checked and I can't find the part you need. Looks like you may have to create the part...
  6. Arouse1973

    Capacitor?

    Can you take a picture of the damaged capacitor and post it for us to see? Thanks Adam
  7. Arouse1973

    Resistors, Capacitors, Zener diodes... Why the funny values?

    Hi Dorke I knew the answers to these questions. It was meant for people new to electronics who may find the values strange, that's all. But thanks for answering :) Adam
  8. Arouse1973

    Lithium Ion 18650 cell capacity

    To get close to the capacity claimed within the cells data sheet you have to discharge and charge to the spec they say. If that is what you have put above then doing this should get you close. You will need a low voltage constant current sink to allow you to do the discharge test. Using just a...
  9. Arouse1973

    Lithium Ion 18650 cell capacity

    That is mostly for primary cells like Lithium Thionyl Chloride, where this effect is very noticeable as well as orientation of the cell. Lithium Ion cells, not so much. I haven't done a study on this but to all accounts it's not a big deal. Thanks Adam
  10. Arouse1973

    Lithium Ion 18650 cell capacity

    Maybe you have a slightly bigger version of battery inside lol :)
  11. Arouse1973

    Lithium Ion 18650 cell capacity

    Not sure Ronnie. Never used LG batteries. I guess you would have to Google for a data sheet if you haven't already. Thanks Adam
  12. Arouse1973

    Lithium Ion 18650 cell capacity

    All qualified commercial battery packs, well the ones I have designed should incorporate battery protection. This includes overcharge, over discharge and short circuit protection. You will however have a cut off voltage which is what the manufacturer of the pack has decided to put in their...
  13. Arouse1973

    Lithium Ion 18650 cell capacity

    Yes you are correct with 4.1 volts versus 4.2 volts. 4.1 volts charging voltage gives approx. 80% capacity. The extra 20% versus reduced battery life if charged to 4.2 volts is not worth charging at 4.2 volts unless you really need that extra capacity and are not worried about the reduced...
  14. Arouse1973

    Lithium Ion 18650 cell capacity

    That's your problem. The cut off voltage is too high. Have a look at this data sheet as an example. The capacity graph should explain all :) Thanks Adam http://www.elumeen.com/media/wysiwyg/produits/Elumeen_panasonic_NCR-18650B_en.pdf
  15. Arouse1973

    Lithium Ion 18650 cell capacity

    To further answer your question tell us what voltage you are charging the batteries to and what cut off voltage you are terminating the discharge at. How are you discharging the cells to arrive at your calculation of capacity. Also please post a data sheet of the cell or any information you have...
  16. Arouse1973

    Lithium Ion 18650 cell capacity

    Yes the stated capacity of the cell would have been tested at a particular cell cut off voltage and cell charging voltage 4.1 or 4.2 volts. This can make a difference and as Harald has said it's sometime in the hands of marketing :) Adam
  17. Arouse1973

    Using super cap for smoothing

    Ok can you take a pic? I might be able to recognise the type from a pic. Cheers Adam
  18. Arouse1973

    Arduino and measuring the output of a BC547C

    For an indication that the level of charge is changing you will need to measure a point on the circuit that is also changing with a change in charge. If you want to measure this using the A-D port of the Arduino then it might be a good idea to use a point that changes voltage or current over a...
  19. Arouse1973

    Arduino and measuring the output of a BC547C

    Hello. How would I do this. I would get a phototransistor and measure the brightness of the LED using that. This solves two problems. One is it's non invasive so won't interfere with the circuit and it's operation. Two it will allow you to still use 9 volts for your supply voltage to the circuit...
  20. Arouse1973

    How to drive an H Bridge using AOP605

    The current drawn by the BJTs will be very tiny so thin traces are fine. I wouldn't do what you have done in the diagram above. I don't see the problem in tying them to ground instead of the sources of the FET why do you thing this will be an issue? Have you started the PCB layout yet? Adam
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