EverCool Variable Voltage Mod
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It looks like I might have a little time this weekend to put together the okr regulator, I will put it together on my variable power supply first and run some numbers for you so we can see how it compares to the TI.
Ok, it happened again today. It was the "Everhot" this time and the rear battery again! On my way to work I took a few pulls off of it at 4.5v with a 3.2 ohm 510 carto. When I was walking in to work I went to take another drag....nothing. Check the carto to see if screwed in all the way.. check. Check the wiring... nothing's come loose. When I got in I checked the battery voltage with a multimeter. The front battery was at 4.01 volts and the back battery(negative) showed 0.00 volts! WTF! I got it to hit once when I went to lunch, but no more after that. I just got home and the back battery is still showing 0.00 volts so I marked it and put it on the charger. Red light! It's charging! So I took it off and checked the voltage again... 3.24 volts. WTH is going on here? This has happened on both my Evercool and Everhot now. Is it just that trustfire 14500s suck when stacked? I'm at a total loss here. These are the regular blue protected trustfires that everybody uses, so why are they giving me fits? LOL!
Trustfires + the only thing you can trust is they lie like hell on their mah ratings. Could just be you got a bad batch of batteries. Personally i have made the decision to not use China made batteries anymore and will only buy Japan or Korean made ones by a reputable company like Panosonic. Really to get a true reading on the batteries after a charge you need to load test them. Just putting a volt meter on wont tell you if they are good or not. A bad battery can show 4.2 volts all day long without a load on it. Other then that outside chance the charger could be a culprit. Not sure what you can do without a battery load tester besides buy some new batteries and see what happens.
Pretty sure the 0 volts just means the protection circuit kicked in. After you charged it for a bit it reset itself.
Pretty sure the 0 volts just means the protection circuit kicked in. After you charged it for a bit it reset itself.
This is the efficiency run for the OKR-T10
View attachment OKR-Tslash10-w12 efficiency run.pdf
Hope this helps with the decisions.
View attachment OKR-Tslash10-w12 efficiency run.pdf
Hope this helps with the decisions.
Yay, Today I get to actually build my evercools. I am building a no battery 12 V input passthrough evercool to use at my desk and in my truck, and a battery evercool for use when away from that one.
When I used the setup with the OKR T10 on the breadboard yesterday, it rocked.
When I used the setup with the OKR T10 on the breadboard yesterday, it rocked.
Here is the 12 Volt passthrough. It is awesome. Great vapor, great throat hit, lousy soldering (I am getting shaky in my old age). 
I just want to give many thanks to BigBlue30 for the idea, WillyB for all of his comments throughout the thread which helped to clarify things, CapeCad for all his awesomeness and Warp1900 for his ideas for using RCA jacks.
I will work on the battery powered one next weekend, my granddaughter wants more of my time tomorrow.
BTW, that is a NC switch for the inhibit, didn't have a tactile switch yet, but had about 50 of these lying around.
I just want to give many thanks to BigBlue30 for the idea, WillyB for all of his comments throughout the thread which helped to clarify things, CapeCad for all his awesomeness and Warp1900 for his ideas for using RCA jacks.
I will work on the battery powered one next weekend, my granddaughter wants more of my time tomorrow.
BTW, that is a NC switch for the inhibit, didn't have a tactile switch yet, but had about 50 of these lying around.
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These mods are getting easier and easier for me to build now. With a pot of flux, a tin of cleaner/tinner, I am rockin solder like a kid rocks play-dough. This stuff is much easier to work with when using flux.
A couple nights ago I decided to clock how fast I can build one. Got it down to under an hour. If I can build mods as fast as I can build computers, I'll be set
A couple nights ago I decided to clock how fast I can build one. Got it down to under an hour. If I can build mods as fast as I can build computers, I'll be set
I'm embarrassed to say I have no clue as how to interpret your chart.
Here is one line. Are we looking at some volts, amps, watts?
I'm embarrassed to say I have no clue as how to interpret your chart.
Here is one line. Are we looking at some volts, amps, watts?
I reordered tlocke's results and calculated resistive load so I could understand them better.
Vin Unloaded
Vout Unloaded
Vin Loaded
Vout Loaded
Iin Loaded (Amps)
Iout Loaded (Amps)
Pin Loaded (Watts)
Pout Loaded (Watts)
Efficiency
Page 2
V out L/V in L
V in L - V out L
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That looks like a fairly efficient regulator, but isn't the TI PTR08100W a little more efficient?
How did you come up with that conclusion? I have not seen results of similar load, input voltage, and output voltage under similar test setup.
Sorry about that guys, I was so used to it by the time I got done with the results that I didn't think to format it. That run was actually done .05 v at a time from top to bottom, I just decided it was way too much info to leave it all in.
2 of the things I found funniest about doing the run was the Resistance changes, it is a perfect example for me to use with my guys when it comes to explaining how temperature changes resistance, the actual resistance on that run was a 2.8 Ohm resistor bank. I started the run using an actual atty, but... I burned it up. LOL, so I used the same resistance for the run that that atty was, but started from the beginning.
The other thing was how in a few situations I saw the numbers not stay linear, just goes to show that there are sweet spots in most transistor type circuits.
The stated efficiency for the TI is significantly higher than this, however, the stated efficiency for this is between 1.5 to 2% greater than what I found also. Part of the problem is the entire run was done at max voltage output vs minimum voltage input since that is the greatest stress point on a Voltage Regulator.
If we use the stated numbers for efficiency from TI and from Murata (this one) then we can assume about a 4% difference in efficiency. Since I will build a bunch of these for friends and family who will only be able to pay a little at a time for the parts or maybe never, (I hope they can since they are spending way less on ecigs than they did on analogs) I would like to keep the cost down. The TI is 16.72 from my supplier, this one is only 11.48.
So, if anyone would like to send me a TI for testing, PM me and I will put it on the same board layout and we will see. But 4% to me seems a small price to pay for lower cost and no caps required or even recommended by the manufacturer for our application (which lowers the price even more).
The major reason for this run was the voltage difference portion which was a concern of WillyBs. I wanted to run real world numbers for him and not just state "I don't see a problem with mine" LOL He has been very helpful on here and if I have a chance to answer up a concern of his, I will do so.
2 of the things I found funniest about doing the run was the Resistance changes, it is a perfect example for me to use with my guys when it comes to explaining how temperature changes resistance, the actual resistance on that run was a 2.8 Ohm resistor bank. I started the run using an actual atty, but... I burned it up. LOL, so I used the same resistance for the run that that atty was, but started from the beginning.
The other thing was how in a few situations I saw the numbers not stay linear, just goes to show that there are sweet spots in most transistor type circuits.
The stated efficiency for the TI is significantly higher than this, however, the stated efficiency for this is between 1.5 to 2% greater than what I found also. Part of the problem is the entire run was done at max voltage output vs minimum voltage input since that is the greatest stress point on a Voltage Regulator.
If we use the stated numbers for efficiency from TI and from Murata (this one) then we can assume about a 4% difference in efficiency. Since I will build a bunch of these for friends and family who will only be able to pay a little at a time for the parts or maybe never, (I hope they can since they are spending way less on ecigs than they did on analogs) I would like to keep the cost down. The TI is 16.72 from my supplier, this one is only 11.48.
So, if anyone would like to send me a TI for testing, PM me and I will put it on the same board layout and we will see. But 4% to me seems a small price to pay for lower cost and no caps required or even recommended by the manufacturer for our application (which lowers the price even more).
The major reason for this run was the voltage difference portion which was a concern of WillyBs. I wanted to run real world numbers for him and not just state "I don't see a problem with mine" LOL He has been very helpful on here and if I have a chance to answer up a concern of his, I will do so.
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The efficiency of both converters is stated with different conditions, although neither states efficiency of these conditions. You can't compare directly from the data sheets.
Efficiency is a direct result of input voltage, output voltage, output current, and duty cycle. Based on the duty cycle you measured, the TI should not be any more efficient.
Efficiency is a direct result of input voltage, output voltage, output current, and duty cycle. Based on the duty cycle you measured, the TI should not be any more efficient.
Shouldn't be, but it is possible, the only way I can really answer it is to do an identical run.
Don't you just luv these two?
As far as price there is also the kid brother 6A (way more than enough) PTR08060W @ $12.39 at Mouser.
PTR08060WVD Texas Instruments Switching Converters, Regulators & Controllers
Great price here, $8.38.
Texas Instruments PTR08060WVD,5SIP Module,Step Down,6 A,0.6 to 5.5 V -
As far as price there is also the kid brother 6A (way more than enough) PTR08060W @ $12.39 at Mouser.
PTR08060WVD Texas Instruments Switching Converters, Regulators & Controllers
Great price here, $8.38.
Texas Instruments PTR08060WVD,5SIP Module,Step Down,6 A,0.6 to 5.5 V -
Don't you just luv these two?
As far as price there is also the kid brother 6A (way more than enough) PTR08060W @ $12.39 at Mouser.
PTR08060WVD Texas Instruments Switching Converters, Regulators & Controllers
Th
Great price here, $8.38.
Texas Instruments PTR08060WVD,5SIP Module,Step Down,6 A,0.6 to 5.5 V -
Absolutely.... Willie...remember back in the day...when this was a Evercool thread....lol
LOL, sorry guys, I get so excited about trying new things. It is definitely the Evercool thread, I love this mod, and am sorry if I hijacked it for strange electronic discussions.
Sorry, didn't know the Evercool could only be made with the TI converter. We have a restriction on the other components?
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