EverCool Variable Voltage Mod

[Budjiman1]

Or...does anyone know where I can but most of the parts needed in one place? I have the TI chip... I just need the pot, caps and resistors... any suggestions guys?

BTW...AWESOME POSTS!!!!!!!!!!!!! you all are very helpful!

 

[o4_srt]

Or...does anyone know where I can but most of the parts needed in one place? I have the TI chip... I just need the pot, caps and resistors... any suggestions guys?

BTW...AWESOME POSTS!!!!!!!!!!!!! you all are very helpful!

everything should be available from Mouser

 

[Java_Az]

Digi-Key is also another good place for parts pretty comparable to Mouser prices

 

[o4_srt]

Digi-Key is also another good place for parts pretty comparable to Mouser prices

their website isn't as pretty though

 

[Budjiman1]

Placed an order with mouser yesterday... can't wait to get my parts. I grabbed a thumb wheel pot, a " one" turn pot and the pots that big blue used...(I think)...lol.

 

[Emris]

Placed an order with mouser yesterday... can't wait to get my parts. I grabbed a thumb wheel pot, a " one" turn pot and the pots that big blue used...(I think)...lol.

Got a part number on that pot? I have everything on order, just cant find the cap!
As far as the CAPS go, do they have to be 16V? Seems a bit over kill, just wondering if
it would be OK to use a smaller voltage CAP that is easyer to find!

 

[grantemsley]

Got a part number on that pot? I have everything on order, just cant find the cap!
As far as the CAPS go, do they have to be 16V? Seems a bit over kill, just wondering if
it would be OK to use a smaller voltage CAP that is easyer to find!

It is typical to use capacitors that are around twice the maximum voltage you will be putting into it. The input side will get around 8v from 2 freshly charged batteryes, so 16V is a good spec to go with. Running them right at their rated spec can cause them to fail.

 

[Emris]

I just built one of these and it vaped great for about a min, Then it would shut down. Popped in some fresh batts and it did the same thing. I didnt have a vari resistor, I just used a 100ohm. Im lost on this one now. I am wondering if the chip is shutting down for some reason!

 

[grantemsley]

I just built one of these and it vaped great for about a min, Then it would shut down. Popped in some fresh batts and it did the same thing. I didnt have a vari resistor, I just used a 100ohm. Im lost on this one now. I am wondering if the chip is shutting down for some reason!

100 Ohms is much too low. According to the datasheet, "The VOAdjust pin must never be connected directly to GND. The minimum resistance between VOAdjust and GND is limited to 240 Ω." You are probably triggering a self protection mode of the chip. Or damaging it. Not sure which. The minimum of 240 Ohms should give you about 5.5v.

That's almost certainly the problem, but if it's not, it could also be shorting the output (with some connectors if you screw the atty on too tightly you can short it out). This will put the regulator into overcurrent protection mode where it tries to turn on several times a second but never fully turns on. It makes a weird noise if you do that (at least mine does)
-

 

[harpo]

Is it possible to make this with a mechanical switch? I have a Reo Grand and I'm considering converting it to VV.

 

[grantemsley]

Yes you use a mechanical switch. But it has to be a NO (Normally Open) switch. Most are normally closed. Switches with 3 legs usually offer both.

 

[WillyB]

100 Ohms is much too low. According to the datasheet, "The VOAdjust pin must never be connected directly to GND. The minimum resistance between VOAdjust and GND is limited to 240 Ω." You are probably triggering a self protection mode of the chip. Or damaging it. Not sure which. The minimum of 240 Ohms should give you about 5.5v.

That's almost certainly the problem

Substituting a 100Ω resistor for the "vari resistor" is not too low, it will work fine. After all in adjusting the 200Ω trimmer at some point it will end up at 100Ω for a rather sweet 4.3V. The circuit uses a 220Ω static resistor plus the 200Ω variable. You are making the assumption that he made 2 changes to the circuit.

I didnt have a vari resistor, I just used a 100ohm

If he followed the the schematic and substituted a 100Ω static for the 'vari resistor' he is now at 320Ω total, which should provide 4.3V.

harpo

Is it possible to make this with a mechanical switch? I have a Reo Grand and I'm considering converting it to VV.

Yes, any REO switch will work.

 

[givesuhe11]

Ive been lurking here and there for weeks practicing and studying mods and such n such... That being said... BIG BLUE WHERE ARE YOU!?! I have some technical questions for BigBlue about the EverCool mod... Ive made several other mods before this (experimenting) and now I have made this advanced one several times... I love this mod!

I got one of the Texas Instrument circuits listed in this thread, made the mod, it works great, so I got another and another and another(TI circuits)... I also ordered some of the other similar circuits they have for variable voltage applications and I now have almost 20 different circuits to make mods with... its vaping NIRVANA!! Im re-discovering flavors because they are so much more robust and rich with this mod. I have upwards of 40 flavors and they are all almost new to me when using this mod. Hope this isnt considered spamming... I really need to talk to BigBlue... or anyone that might answer at least this question:

My biggest question is this: I have this circuit from TI (http://focus.ti.com/lit/ds/symlink/pth08080w.pdf) and I cant figure out what potentionmeter to use for it... I know BigBlue would know if he would only look at the spec sheet there... and maybe he would even tell me the formula to use in the future should I find any new circuits to utilize... so I will know what pot goes to what circuit... I will post pics of the mods I have already built with Texas Instruments amazing circuits soon! well heres one, I hope this works and y'all can see this

firstrow board from madvapes, then topview, all components soldered

This is the ptr08060 in a 4xAAA (twin 10440's) 510 CE2 v4 3ohm cartomizer

This is ptr08100 in a 4xAA box (twin 14500's) same carto


Ok... here is my setups... I use the TI ptr08100 circuit in a 4xAA box, (twin 14500 batts), and a ptr08060 circuit in a 4xAAA box, (10440 batts), with Bigblues Evercool mod... with a couple modifications of my own, I use a mosfet for the switch so I can use a tactile and I wire the potentionmeter to a different spot in the box to have access to the adjusting screw with the cover on, notice on the AAA box the adj screw is on the bottom, on tht AA box its on the side. I also have pth08080 circuit but I'm looking for the perfect box to put that in and like my orginal post stated, I need to find out what pot/adj to use with it. Since they came out, I exclusively use 510 CE2 v4 cartomizers... 3.0ohm only with high voltage... Ive used 510 LR atty's and cartomizers but on the LR atty, on voltage over 4v, I have to keep it soaked (and I mean bubbly soaked)or it will taste burned and on the LR cartomizers I cant go over 4.2v or it will taste nasty burned. with the v4 cartos, I take out all the silicon plugs... and u cant lay it down on its side or it will leak all over. but my mods all stand up so its not too big a deal.
(I think I just plagerized myself... lol)

 

[Emris]

Substituting a 100Ω resistor for the "vari resistor" is not too low, it will work fine. After all in adjusting the 200Ω trimmer at some point it will end up at 100Ω for a rather sweet 4.3V. The circuit uses a 220Ω static resistor plus the 200Ω variable. You are making the assumption that he made 2 changes to the circuit.

If he followed the the schematic and substituted a 100Ω static for the 'vari resistor' he is now at 320Ω total, which should provide 4.3V.


Yes, any REO switch will work.

Yes, I am exactly at 4.3 Volts. I was wondering if the batteries are clipping on me for some reason! That is what it acts like. At first every thign is fine, vape for a fer sec and nada. The led gets super dim until I turn it off and back on then the led is bright again. I can get about a 1 to 2 sec vape the it stops!

 

[Emris]

I got it fixed. It had nothing to do with my batts or my soldering skills. It was the carto! Both of my 5V mods have been doing the same thing. As soon as I changed the catro out all was good. I think I like 4.3v way more than a straight 5V!

 

[bigblue30]

100 Ohms is much too low. According to the datasheet, "The VOAdjust pin must never be connected directly to GND. The minimum resistance between VOAdjust and GND is limited to 240 Ω." You are probably triggering a self protection mode of the chip. Or damaging it. Not sure which. The minimum of 240 Ohms should give you about 5.5v.

That's almost certainly the problem, but if it's not, it could also be shorting the output (with some connectors if you screw the atty on too tightly you can short it out). This will put the regulator into overcurrent protection mode where it tries to turn on several times a second but never fully turns on. It makes a weird noise if you do that (at least mine does)
-

Grantemsley, You are correct. 100 ohms will trigger a shutdown every time. AND thanks for filling in for me....I love my new job but it does take time away from mod'ing.

prophetz, These chips are almost built proof.....AS long as the adjust pin never goes below 240 ohms. One you "fix" it do not be surprised if the chip quits working.

 

[bigblue30]

I got it fixed. It had nothing to do with my batts or my soldering skills. It was the carto! Both of my 5V mods have been doing the same thing. As soon as I changed the catro out all was good. I think I like 4.3v way more than a straight 5V!

Glad you got it going.......

 

[bigblue30]

Ive been lurking here and there for weeks practicing and studying mods and such n such... That being said... BIG BLUE WHERE ARE YOU!?! I have some technical questions for BigBlue about the EverCool mod... Ive made several other mods before this (experimenting) and now I have made this advanced one several times... I love this mod!

I got one of the Texas Instrument circuits listed in this thread, made the mod, it works great, so I got another and another and another(TI circuits)... I also ordered some of the other similar circuits they have for variable voltage applications and I now have almost 20 different circuits to make mods with... its VAPING NIRVANA!! Im re-discovering flavors because they are so much more robust and rich with this mod. I have upwards of 40 flavors and they are all almost new to me when using this mod. Hope this isnt considered spamming... I really need to talk to BigBlue... or anyone that might answer at least this question:

My biggest question is this: I have this circuit from TI (http://focus.ti.com/lit/ds/symlink/pth08080w.pdf) and I cant figure out what potentionmeter to use for it... I know BigBlue would know if he would only look at the spec sheet there... and maybe he would even tell me the formula to use in the future should I find any new circuits to utilize... so I will know what pot goes to what circuit... I will post pics of the mods I have already built with Texas Instruments amazing circuits soon! well heres one, I hope this works and y'all can see this
View attachment 23335View attachment 23336View attachment 23332
firstrow board from madvapes, then topview, all components soldered

View attachment 23333 This is the ptr08060 in a 4xAAA (twin 10440's) 510 CE2 v4 3ohm cartomizer

View attachment 23334 This is ptr08100 in a 4xAA box (twin 14500's) same carto


Ok... here is my setups... I use the TI ptr08100 circuit in a 4xAA box, (twin 14500 batts), and a ptr08060 circuit in a 4xAAA box, (10440 batts), with Bigblues Evercool mod... with a couple modifications of my own, I use a mosfet for the switch so I can use a tactile and I wire the potentionmeter to a different spot in the box to have access to the adjusting screw with the cover on, notice on the AAA box the adj screw is on the bottom, on tht AA box its on the side. I also have pth08080 circuit but I'm looking for the perfect box to put that in and like my orginal post stated, I need to find out what pot/adj to use with it. Since they came out, I exclusively use 510 CE2 v4 cartomizers... 3.0ohm only with high voltage... Ive used 510 LR atty's and cartomizers but on the LR atty, on voltage over 4v, I have to keep it soaked (and I mean bubbly soaked)or it will taste burned and on the LR cartomizers I cant go over 4.2v or it will taste nasty burned. with the v4 cartos, I take out all the silicon plugs... and u cant lay it down on its side or it will leak all over. but my mods all stand up so its not too big a deal.
(I think I just plagerized myself... lol)

Sorry all.........new job leaves little time for mods....but I will try harder. Let me take a look at you questions....brb

 

[bigblue30]

My biggest question is this: I have this circuit from TI (http://focus.ti.com/lit/ds/symlink/pth08080w.pdf) and I cant figure out what potentionmeter to use for it... I know BigBlue would know if he would only look at the spec sheet there... and maybe he would even tell me the formula to use in the future should I find any new circuits to utilize... so I will know what pot goes to what circuit... I will post pics of the mods I have already built with Texas Instruments amazing circuits soon! well heres one,

For this chip the formula is R(set) =10 k ohms X (0.891 v / Vout -0.9 v) - 1.82k ohms not all chips are the same.

Or you can just look on page 7 of the link you sent. http://focus.ti.com/lit/ds/symlink/pth08080w.pdf So for use in a mod....I would use 100 ohm restistor in series with a 2k pot. that would give you 100 ohms to 2.1k ohms. and that would give you about 3.1 volts to 5.5 out

 

[Emris]

Grantemsley, You are correct. 100 ohms will trigger a shutdown every time. AND thanks for filling in for me....I love my new job but it does take time away from mod'ing.

prophetz, These chips are almost built proof.....AS long as the adjust pin never goes below 240 ohms. One you "fix" it do not be surprised if the chip quits working.

With the 220 ohm on the board and the 100 ohm that I added in place of the veri resistor that would be 320 ohms. Well within the safe limits of this chip!