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  1. rurwin

    I'd like a definitive answer once and for all: do amps matter?

    I can turn that argument on its head. See this series build that takes 3 amps? How many parallel builds are there that result in a different vape vs the single unique case that does. See? -- Voltage control is pointless. :p Of course the build makes a huge difference. It always does, for every...
  2. rurwin

    I'd like a definitive answer once and for all: do amps matter?

    I don't think that will explain the error. Resistance is linearly related to power. He's got a 2% error in power and a 0.03% error in resistance. I'm certain enough of the maths to say that I think there is a software bug involved, or at least different assumptions between the serial and...
  3. rurwin

    I'd like a definitive answer once and for all: do amps matter?

    So the only person who doubts that amps matter is the OP, and everyone who answered said they did. What is the problem? Amps, volts and resistance make an inter-related triad. Change one and the others have to change to compensate. Any two define the third and any two define the power. The...
  4. rurwin

    I'd like a definitive answer once and for all: do amps matter?

    Of course Amps matter. Has dr g or anyone else said differently? I can't see what you are arguing about. We have shown you that we can have two builds, using identical mechanics but different electronics, where one is 0.33 ohms and one is 3 ohms. One of them takes 9A and the other takes 3A, and...
  5. rurwin

    I'd like a definitive answer once and for all: do amps matter?

    That doesn't make mathematical sense. If an emf of 0.1V produces 100A, then the coil is 1 milliohm, 0.001 ohms. If I try to build that with Kantal, I'll have a very small coil. If I build it with 0.8mm^2 copper wire, then it will be 5cm long. That size of conductor will take 100A without...
  6. rurwin

    I'd like a definitive answer once and for all: do amps matter?

    The OP asked: If you put three one ohm coils in series, you have 3 ohms. If you put them in parallel, you have 0.33 ohms. That is a very close match to the original question. It is not different; there is no difference. Each coil has 3 amps going through it, each coil has 3 volts across it...
  7. rurwin

    I'd like a definitive answer once and for all: do amps matter?

    If all the coils have exactly the same resistance, exactly the same voltage across them, exactly the same current flowing through them, and they all have the same wicking and the same airflow, what is different? I will even design the atty for you. You have a dripper with six posts. Under the...
  8. rurwin

    I'd like a definitive answer once and for all: do amps matter?

    A (bipolar) transistor is a variable current source. There is nothing more complex about building a variable current source than building a variable voltage source. It is variable power that requires you to measure the load and control one of the others to produce the right power. There is a VA...
  9. rurwin

    The Erlkönigin : PICTORIAL

    Once you try pyrex, you'll never go back to metal or plastic. Jade is a close second, but I don't like ceramic. The cheap ones that your B&M probably has are great, but I just got a fun pair from FT. There's a place in the US that makes hand-made blown glass drip-tips, but they might be larger...
  10. rurwin

    Why do VW devices even exist?

    Personally, I'm currently enjoying a very nice vape at 10W and 5V.
  11. rurwin

    Why do VW devices even exist?

    And the kids miss out on so much fun bump starting cars and being towed by a mate on a short rope. Yeah, I know I'm maintaining the disruptive OT sub-thread, and I even started it. But everything has been said about VV/VW. Now it's just chasing it's own tail.
  12. rurwin

    Why do VW devices even exist?

    Apologies if I caused offense; it wasn't intended. And definitely not mature here. No, I don't think we do. It would improve control and understanding of the process, but it is something of a curate's egg. Firstly we would find that even temperature of whatever is being measured is still not...
  13. rurwin

    Why do VW devices even exist?

    Oh I did. In fact I cheated a bit in order to snark more. 15 year-olds can get a learner's permit in Indiana, where Midniteoyl is. But the the age 18 I gave is for a full license. Actually it is more likely the fact that if you pass your test here on an automatic you are not allowed to drive...
  14. rurwin

    Why do VW devices even exist?

    They aren't. Very few cars are automatic; the great majority are manual. Oh... you live in the USA... that explains it ;-) Probably because you allow kids as young as 15 a driving license. Whereas in the UK, we make them wait until they're 18 to take the test. Which is the whole point and the...
  15. rurwin

    Why do VW devices even exist?

    VA is an interesting idea. Given the same gauge of wire, a VA device will deliver the same power per millimetre of wire, no matter what the coil resistance. But a different wire will require a different setting for the same effect. A VW device will produce the same amount of total heat, no...
  16. rurwin

    Why do VW devices even exist?

    It is power that heats the coil. So the amount of heating that gets done is linearly related to power, but it is related to the square of the voltage. Then the power can be kept constant while the resistance and voltage vary. All of which means that once you find out what power you like to vape...
  17. rurwin

    evolv patents variable wattage!

    Volume controls have been around in their standard form for around a hundred years. The maximum lifetime of a patent is twenty years. Any patents issued before 1994 are now expired and any devices existing before 1994 would invalidate a later patent. Since I built a volume control in 1980...
  18. rurwin

    evolv patents variable wattage!

    Which is the exception that proves the rule. That is a very specific patent; it even claims the transistor types. It has nothing to do with the volume control on your home HiFi.
  19. rurwin

    No solid evidence that e-cigarettes aid smoking cessation unlike the nicotine patches, gums and medications approved now

    I should have been more expansive (it was late). The main trial I know of is the New Zealand one. They used first generation e-cigs and halfway through the trial they found the e-cigs were only delivering one fifth of the nicotine that the smokers were used to. They still finished up ahead of...
  20. rurwin

    No solid evidence that e-cigarettes aid smoking cessation unlike the nicotine patches, gums and medications approved now

    There is tantalising evidence that evidence is being ignored. The ASH Stop Smoking Toolkit for example shows the number of vapers who don't smoke fairly steady at 10%. If they kept vaping, wouldn't that go up? I have a feeling that it is down to the questions asked. I think that when someone...
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