sito in costruzione, ho trovato questa rece:
DARWIN!! From EVOLVAPOR.COM – My Overview and First Impressions – Newest PRE-Production Prototype
I have had over 20 mods & devices. I have also written what I consider more to be over-views/”First Impressions”, as compared to “reviews”, on only 3 of them. I do not consider myself to be a “reviewer” but I do enjoy sharing my perceptions when I am impressed. While I do include my opinions, the simple fact that I have written/posted on only three (prior to this one) is a pretty clear indicator that these devices impress me enough to spend the time to share. I try to be thorough about all aspects I see.
I have always purchased my devices. In one instance, I did receive a discount for prototyping a device and I was clear about that in my post. This is the first time I did not pay money for a device. However, there are 2 reasons (and only 2 reasons) I have this final version pre-production prototype. 1) I have no affiliation with Evolvapor (manufacturer of Darwin) or any other vape vendor or manufacturer. When I saw this device posted here in ECF, I PM’d IcaBod (Evolv) and offered an idea. I suggested that the folding atty connector could be a Master On/Off switch. IcaBod and the Evolv team looked into the idea and decided to put it into the device. 2) After then reading my other posts, the Evolv team decided they wanted my thoughts on the device before final launch. So, while I did not pay to use this prototype, I have already committed to purchase a full production unit. The following points are 100% my observations, perceptions and opinions complimented by a few facts provided by Evolv. This post is 100% of my own volition. I have never agreed or promised to post about any device and I never will.
So, grab your favorite vape and let’s get into it.
Darwin is unlike any other device on the market (so far). There is one other “smart” device presently on the market named ProVari. Many of you may have seen my “First Impressions” post on that device and it is very clear that I am very impressed with it. As ProVari is the only other device, so far, using a Printed Circuit Board (PCB), I really have no choice other than to use it for comparison. Eclipse is another coming “smart” device using a PCB but that device is a feeder and Darwin is not; so I will stick with non-feed comparisons. But, for what it’s worth, Eclipse – while variable voltage (with many impressive features) – appears to not adjust/set to watts (heat levels).
There is just no point in trying to compare Darwin to any device that is not using a PCB. “Smart” devices are the next evolution in e-cigs – there is just no way around this point. One can try to compare an iPhone (or Android) to a basic (“calls only”) cell phone but it is really comparing apples and oranges. I have many other non-“smart” devices and like them very much. There will always be those who enjoy non-“smart” ecigs but Evolv has taken the e-cig device to the next evolutionary step - beyond anything existing.
The device looks different because it IS different. As I mentioned, the atty connector swivels to an “up” (on) position, a “down” (off”) position and is “on” pretty much everywhere in between. This allows vaping with the atty at various angles. On the prototype, the power on/off connection is not in its final design so the atty needs to be in the full up position for consistent vaping. But, the design for production units has already been improved to allow us to vape with the atty at any angle above the full down position (can’t wait to use this).
The LCD display provides readouts of the Watts (heat) setting, currently vaping volts, currently vaping amps, the current Ohms reading of the atty, and a battery level indicator (with bars – similar to a cell phone). The prototype I am using, being a pre-production unit, does not yet display the current Ohms but the final production devices will show this. The display also lights up when the button is activated.
There are two controls: the activation button, which only activates the atty for vaping, and an adjustment “wheel” (see pics). To make a change in the watts (heat) setting, just turn the wheel and see the setting change on the display. The range of settable watts is from 4.2 watts up to 12.7 watts. There is a sort of center stopping spot on the wheel at 8.5 watts (very convenient). The volts and amps indicators show “0.0V” and “0.0A” when the button is not pressed for vape activation. Right now, I have this one set at 8.5 Watts using a Joye 302 atty rated at 3.1 Ohms. When I press the activation button, the display reads “5.2V” and “1.6A”. If I turn the watts setting up to 10 watts and press the vape activation button, the display reads: “5.5V” and “1.8A”. On the production unit, the display will show Ohms reading consistent with the others ("0.0" until activated and then readout actual ohms).
We CAN change the watts (heat) setting during activation (while drawing vapor).
Darwin’s voltage range is from 3.7 thru 12.9 volts and Darwin’s batts are high “C” rated with the ability to push up to 3 Amps, possibly more.
I am told the final button is being custom molded and will the same size but solid, not the flat brass band you see on this prototype.
To be very clear, I am Not an Electrical Engineer (EE) and make absolutely no claims to having any engineering credentials or qualifications. So, while I know there are several EEs who have been monitoring the threads and posting about this device (and they have definite positions about what is possible according to Ohms Law), I am not qualified to engage in those discussions. While I do have an elementary appreciation for some of the underlying principles of Ohms Law, it would at least appear that this device does (as it HAS TO) completely apply ALL aspects of Ohms Law. So, while I cannot address the “how” (as this device incorporates proprietary designs, programming and engineering - to which I am not privy), it is very clear that the device does do certain things differently from any other e-cig/mod/device.
Volts are variable but the device’s microprocessor does the controlling (voltage changes) automatically. The device constantly monitors the Ohms of the atty and constantly makes changes to the volts (even during a hit) in order to maintain constant watts (heat level). As the EEs have already posted, Amps are also part of the overall Ohms law equation. When we activate the device, we can see that the Amps level is also changing. While it seems to me that if Ohms are at a certain level and the device changes the volts to maintain a constant heat level, in compliance with Ohms Law - the amps have to change accordingly (as needed). But, the power management (microprocessor programming and functions) are part of the manufacturer’s proprietary design and, as I said, I do not have that information.
Those of us who have been vaping for a while know there are MANY variables contributing to the overall vape experience. Various batts have different voltages and max amps output levels, attys have different Ohms ratings (which can vary up to +/- .3 ohms), the various wiring and connections in each device, and even the components within the attys themselves can create variances between two of the same size/model attys. Airflow and juices are also variables. But, ultimately, as many know, heat (watts) is the primary factor in creating vapor. Variable volt devices, which allow us to set a fixed voltage at various set levels, was obviously the first step in trying to control the various heat levels. However, even though some devices can set various fixed voltage points (and some more accurately than others), the issue of ohms changing makes maintaining consistent heat level more difficult.
If we look at the only other digitally controlled (PCB) device, like ProVari, ProVari sets voltage points very accurately in .1 volt increments and digitally holds that voltage point stable. The engineers present, if I understand their points, atty ohms may vary during activation but the variations are very small. However, Ohms also appear to fluctuate in an attys resistance over the life of the atty. I have been using the Joye 302 (and other 801 series) attys primarily for a long time now so I have much less experience with the various 510s, 306s and 901s anymore. But, I have often put a brand new 3.1 ohms 302 atty on devices at 5-ish volts and seen the ohms reading drop to the 2.6 range in periods between 4 hours and 4 days. So, when this happens I start noticing my vape getting hotter and hotter and eventually getting a burnt taste. This happens because as the ohms start dropping, and the volts remain the same, the heat level (watts) increases.