what is the best variable voltage e cig?

Question by Miranda: what is the best variable voltage e cig?
i want a variable voltage e cigarette with easy (no tools needed) voltage change atleast up to 5 volts and good battery life. what is the best option out there right now? i dont like boxy shaped mods.

Best answer:

Answer by gabriela
I Think the ProVari is just what you are looking for. It’s tube shaped, can do voltages between 3.3 and 6 and uses only a single battery. It has a display which you can use to change the voltage. It’s very easy, just a few button presses. This mod has received almost perfect reviews everywhere including the ecigarette mod database site (8 perfect reviews!). Read the reviews here:

http://ECigarettesStarterKits.com/go/free-trial

Other variable voltage mods you might be interested are Saber Touch VariVolt, Infinity and Buzz but personally I think ProVari is superior.

Give your answer to this question below!

Linear Variable Displacement Transducer

Principle

LVDT works under the principle of mutual induction, and the displacement which is a non-electrical energy is converted into an electrical energy. And the way how the energy is getting converted is described in working of LVDT in a detailed manner.

Construction

LVDT consists of a cylindrical former where it is surrounded by one primary winding in the center of the former and the two secondary windings at the sides. The number of turns in both the secondary windings are equal, but they are opposite to each other, i.e., if the left secondary windings is in the clockwise direction, the right secondary windings will be in the anti-clockwise direction, hence the net output voltages will be the difference in voltages between the two secondary coil. The two secondary coil is represented as S1 and S2. Esteem iron core is placed in the center of the cylindrical former which can move in to and fro motion. The AC excitation voltage is 5 to 12V and the operating frequency is given by 50 to 400 HZ.

Working :

Let’s study the working of LVDT by splitting the cases into 3 based on the iron core position inside the insulated former.

Case 1:

On applying an external force which is the displacement, if the core reminds in the null position itself without providing any movement then the voltage induced in both the secondary windings are equal which results in net output is equal to zero

i.e., Esec1-Esec2=0

Case 2:

When an external force is applied and if the steel iron core tends to move in the left hand side direction then the emf voltage induced in the secondary coil is greater when compared to the emf induced in the secondary coil 2.

Therefore the net output will be Esec1-Esec2

Case 3:

When an external force is applied and if the steel iron core moves in the right hand side direction then the emf induced in the secondary coil 2 is greater when compared to the emf voltage induced in the secondary coil 1. therefore the net output voltage will be Esec2-Esec1

Advantages:

* Infinite resolution 
* High output 
* High sensitivity 
* Very good linearity 
* Ruggedness 
* Less friction 
* Low hysteresis 
* Low power consumption.

Disadvantages:

* Very high displacement is required for generating high voltages. 
* Shielding is required since it is sensitive to magnetic field. 
* The performance of the transducer gets affected by vibrations 
* Its is greatly affected by temperature changes.

Applications:

Its used to measure displacement ranging from fraction millimeter to centimeter.

Acting as a secondary transducer, it can be used as a device to measure force, weight and pressure, etc..

 

To Understand more about Linear Variable Displacement Transducers read the post written by me with construction images in my blog about LVDT.

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