thanks kjj, java,,,,Clears up those and other questions. I did check the data sheet out but I was unsure about reading correctly it with variable resistance inline
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EverCool Variable Voltage Mod
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I could only make it up to page 27 and I need to hit the rack now but I have a question. I hope this wasn't already answered after page 27.
It's about the TI chip: http://focus.ti.com/lit/ds/symlink/pth08080w.pdf
Is this enough output current for this mod? That's it.... that's my question.
Anyone who has an opinion about this please fire away at me.
It's about the TI chip: http://focus.ti.com/lit/ds/symlink/pth08080w.pdf
Is this enough output current for this mod? That's it.... that's my question.
Anyone who has an opinion about this please fire away at me.
The chip you have here is only good for Up to 2.25-A Output Current at 85°C or about 10 watts:
In my opinion that's a little on the low side, but would work on the lower voltage range.
The chip I used:http://focus.ti.com/lit/ds/symlink/ptr08100w.pdf
The PTR08100W is a highly integrated, low-cost switching regulator module that delivers up to 10 A of output current or about 100 watts.
Thank you for the answer BB. If my calculations are are right, off the top of my head, with a 2.2ohm atty, 5v or 4.9v is about at the limit of that 2.25A rating. I wonder what would happen if you pushed it up to the max 5.5v? would the chip cutout or just limit the current at 2.25A @4.9v?
One more question. Last I'd read pre post page 25 you were going to try your mod without the two caps. Has that worked out for you?
I'll continue reading this tread from page 25 to present later today when I can free up a bunch of time. Thanks for your great mod.
One more question. Last I'd read pre post page 25 you were going to try your mod without the two caps. Has that worked out for you?
I'll continue reading this tread from page 25 to present later today when I can free up a bunch of time. Thanks for your great mod.
I have ben sandbagging on this thread for almost a month now!!! I ordered the free sample TI PTR08100WVD. I assembled my mod with a different trim pot (A 1K pot) and I must say WOW!!! This is the best vaping experience I have had yet. The 5v mod I built is just to much with the carto's I have. Being able to fine tune the voltage for the individual carto's is priceless. I never posted on here before I built this mod and I had to hurry up and make my 5 posts in the new member thread so I could come say "THANKS BIGBLUE30" Your the man!!! I wish I could read the lowest voltage but my meter doesn't go below 2.8v but I have seen 2.64 with this mod, after that my meter craps out. The high side Is a whopping 5.8v but I haven't found a use for anything over 4.38 yet. So far I have gotten 26+ hours of heavy chain vaping Out of a set of trustfire 14500 bats and a 10ml DIY tank. TI chip is Ice Cold form start to finish. One more time Thanks BigBlue!!!
A great big 'ol thank you like that just made bigblue's day I'm sure.
Now we need pics, lots of um.
I want to thank you too BigBlue, I used your info on the 8100WVD to build it into my VV Copper Mod. Now to add the digital pot.
Heres a few with the voltage output readings Hurray my meter detects 2.57v before cutout this time, and it will still go much lower on my pot. 4.36v is what I vape at. 5.8v is max on my pot. Hey breaktru Love your calc I use it almost daily.
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breaktru, you are welcome too. When I found this chip and posted it on the board I never thought it would take off like it did.
so, you used a 1k pot...I can basically use any pot I want? I am trying to find a knob for mine so i dont have to do the screwdriver thing. they dont seem to make surface mount trimmers at 200 ohm .25 watt!
I guess i'm just too uneducated to figure this one out
dont think I can glue a knob to these tiny trimmers and the thumbwheel one I got is only rated at 200 cycles.
anyone have any experience with this dilemma?
I mean i dont really plan on adjusting that much just would like to not have to carry around a screwdriver.
I guess i'm just too uneducated to figure this one out
dont think I can glue a knob to these tiny trimmers and the thumbwheel one I got is only rated at 200 cycles.
anyone have any experience with this dilemma?
I mean i dont really plan on adjusting that much just would like to not have to carry around a screwdriver.
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You dont want to slap just any old pot on this chip. Really 200 ohms with a 240 resistor is pretty ideal. That set up will give you a voltage range of 5.5 volts to 3.4 volts. A 1k pot will take the voltage swing lower , 1.6 to 5.5 volts . No one is going to vape @ 1.6 volts so it is a bit of a waste. 3.4 to 5.5 volts is more of a usable voltage range as far as powering atomizers go.
I only used a 1k pot because jameco uses ups and they take almost a lifetime to ship, its ben over a week now and I still don't have my 200ohm pots. On that note I will say I have a few 2.4-2.6 xl clearomizers that are loving 2.9-3.1v with my watermelon and banana waffle liquid. Any higher on the voltage and and the wicking cannot keep up. 3 hits and burn/cough/spit. I prolly could mod the clearomizers but why if I can just adjust the voltage and vape away without a dry hit. The versatility of this mod is incredible. So far anything under 2.9v and over 4.4v has ben a waste for me but hey who knows what the next cartomizer will want.
Hey Woodsmith,
In picture 23 you can see the adjuster knob I made from a plastic pc thumb screw sitting on the desk. If you look at picture 21 you can see the adjuster knob in the upper left corner of my box. It just snaps into a slot in the box, when I need to adjust I just pull it out and dial in the best vape for my situation. I can't thank BigBlue enough for this info, I went from carrying 3 pv's to just one now, totally friggin awesome.
Hey Woodsmith,
In picture 23 you can see the adjuster knob I made from a plastic pc thumb screw sitting on the desk. If you look at picture 21 you can see the adjuster knob in the upper left corner of my box. It just snaps into a slot in the box, when I need to adjust I just pull it out and dial in the best vape for my situation. I can't thank BigBlue enough for this info, I went from carrying 3 pv's to just one now, totally friggin awesome.
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I bought 2 packages of 5 at Electonic Goldmine for $1 for 5. 200 ohm trimmer resistors that were perfect for my tube mod. With the 200 ohm trimmer and a 220 ohm fixed resistor in series you will get better selectivity of your 3.4v to 6.1volts in a 360 degree radius.
K, I poked through a bunch of this thread and could not find the answer...
WHERE the hell did you guys get that PCB with just the straight lines connected (like a breadboard)?!?! When I first scanned through the thread, I just grabbed the diagrams, schematics, etc.
I've been messing with this for about a week now and going nuts just trying to make due with what I found at RatShack, but it was not pretty.
WHERE the hell did you guys get that PCB with just the straight lines connected (like a breadboard)?!?! When I first scanned through the thread, I just grabbed the diagrams, schematics, etc.
I've been messing with this for about a week now and going nuts just trying to make due with what I found at RatShack, but it was not pretty.
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The "Mini Pre cut Interconnect Circuit Board"? Are you friggin kidding me?! That's one of the first places that I looked, but there are no pics of the backside so I just assumed it was just prepunched.
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