iStick

[DiscoDes]

The charging circuitry is built into the iStick so it does not matter what current the power supply is as the iStick will pull the current that it needs. If you use a low current output power supply it may take a bit longer as it probably draws around a amp.

Remember current is pulled not pushed.

[robby]

Nov 1, 2014 14:13:41 GMT sleedale said:

Well, that's an eye opener

Iv'e just looked at two iPhone chargers.......the old one, that came with my iPhone 3gs and iPad 2, says it outputs at 5.1V 2.1 A (that's the plug that came in two parts you connected together)

The newer charger, that came with the iPhone 5 says it outputs at 5V 1A (the smaller, slimmer plug type)

I use the old one for the Kindle, no problems......well the Kindle still works and charges fine.

So technically I should be able to use the newer one for the iStick, as the plug that came with the iStick outputs at 5V or 500mA (assume that's .5 A?)

So many chargers, so little time

It does state somewhere that you can use a 1 amp charger, the 1 amp one will be fine sleedale, that`s what I use

[robby]

Nov 1, 2014 14:25:51 GMT DiscoDes said:

The charging circuitry is built into the iStick so it does not matter what current the power supply is as the iStick will pull the current that it needs. If you use a low current output power supply it may take a bit longer as it probably draws around a amp.

Remember current is pulled not pushed.

The only thing that would worry me is if the Istick developed a fault somewhere and it drew too much current, not likely but I would rather not have the possibilty of more than an amp going through it.

[VapingBad]

Nov 1, 2014 14:25:51 GMT DiscoDes said:

The charging circuitry is built into the iStick so it does not matter what current the power supply is as the iStick will pull the current that it needs. If you use a low current output power supply it may take a bit longer as it probably draws around a amp.

Remember current is pulled not pushed.

Absolutely right for decent devices and I would the iStick is one, it's easy enough to check with a "USB Charge Doctor" for about £2 off eBay.

Sorry to be a pedant DiscoDes "current is pulled not pushed" is only a metophore to help students understand passive circuits (or lies to children as Terry Pratchett would say).  IMO it should not be used when talking lithium batteries that typically have an internal resistance on around 0.1 ohm.  Which in that metaphor means those batteries would (try to) pull 420 A from a 4.2 V supply and with out current limiting that is dangerous.  Most DNA mods (ones that use the Evolv charger will allow as much current from the power supply as the battery will accept (VTC4s are only 0.013 ?) and burn out the charger board which is only rated for 500 mA. The metophore works for well behaved appliances and passive components, but current can be induced by moving a conductor in a magnetic field for example.

[sleedale]

Nov 1, 2014 14:52:59 GMT VapingBad said:

Nov 1, 2014 14:25:51 GMT DiscoDes said:

The charging circuitry is built into the iStick so it does not matter what current the power supply is as the iStick will pull the current that it needs. If you use a low current output power supply it may take a bit longer as it probably draws around a amp.

Remember current is pulled not pushed.

Absolutely right for decent devices and I would the iStick is one, it's easy enough to check with a "USB Charge Doctor" for about £2 off eBay.

Sorry to be a pedant DiscoDes "current is pulled not pushed" is only a metophore to help students understand passive circuits (or lies to children as Terry Pratchett would say).  IMO it should not be used when talking lithium batteries that typically have an internal resistance on around 0.1 ohm.  Which in that metaphor means those batteries would (try to) pull 420 A from a 4.2 V supply and with out current limiting that is dangerous.  Most DNA mods (ones that use the Evolv charger will allow as much current from the power supply as the battery will accept (VTC4s are only 0.013 ?) and burn out the charger board which is only rated for 500 mA. The metophore works for well behaved appliances and passive components, but current can be induced by moving a conductor in a magnetic field for example.

I really wish I understood that.........I'll just stick with what I've got, know that it's as safe so it can be, and not be so impatient. After all, it's not as though I don't have anything else to use in the meantime. I consider myself very lucky for that. And I do love the little iStick, hope it lasts.
thanks guys for ALL your input on this, maybe I should try to learn more about electricity, amps, watts, current and so on.....however, at my age, I think I probably won't, just ask on here.

you really are all very lovely you know 

[VapingBad]

sleedale I got a bit techie (somethings are a red rag to a bull) and ignore any of that post that is too techie, you should be fine with any decent USB adapter and the iStick.

I started a thread about a very simple £2 device that you can use to measure this and see if you are getting too little, enough or too much power from your USB plug.

[sleedale]

VapingBad.......I really, really did mean I wish I understood what you were saying, it's in no way any sort of criticism, I sort of wish I'd had a much better physics teacher at school. I want to understand, I want to know, but I'm afraid at this stage of the game, not sure I ever will. One of the problems with online as apposed to face to face, the subtleties are missing. And I'll chase up the device that checks usb plugs, when I think of how many I blindly use assuming they will be ok, and yes overnight too....... I also like to read useful information ......some of it might stick.

However, my little blue bundle of joy has again decided to fry my cw wicks......seems like every alternate day, just to remind me that NOTHING in this world is ever perfect. And all I did was change a tank, it obviously doesn't like orange flavour, maybe thinks orange clashes! Onwards and upwards, as they say........

[robby]

sleedale, you can have a lifetime of this stuff and it still trips me up every now and again

[sleedale]

Yup robby it's the way it goes, life is too short to fret about it though. Little blue seems to like lemon sorbet and a quick switch to volts, although I've probably spoken too soon.

[Deleted]

That's gone right over my head!!! Whoooooosh

[Greg]

Surely it needs to be an alternating magnetic field though or at least phase adjusted

[VapingBad]

Nov 1, 2014 18:07:52 GMT Greg said:

Surely it needs to be an alternating magnetic field though or at least phase adjusted

Moving the conductor in the magnetic field varies the magnetic flux from the conductors perspective.

[Greg]

Nov 1, 2014 18:17:54 GMT VapingBad said:

Nov 1, 2014 18:07:52 GMT Greg said:

Surely it needs to be an alternating magnetic field though or at least phase adjusted

Moving the conductor in the magnetic field varies the magnetic flux from the conductors perspective.

You will change the flux but you won't induce any current with a dc supply unless the the magnetic field is changing or rotating

[VapingBad]

Nov 1, 2014 18:24:00 GMT Greg said:

Nov 1, 2014 18:17:54 GMT VapingBad said:

Moving the conductor in the magnetic field varies the magnetic flux from the conductors perspective.

You will change the flux but you won't induce any current with a dc supply unless the the magnetic field is changing or rotating

Moving the conductor in the magnetic field varies the magnetic flux from the conductors perspective. Is changing the field from the conductors perspective, move a coil between the poles of a horse shoe magnet and it will induce some emf and if the coil is in a circuit some current.

[sleedale]

Yes but does it make the tea?