EverCool Variable Voltage Mod
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Madshock,
The reason TI suggests the caps is really because this chip is meant to power delicate equipment. The output cap is really there to make sure there is no AC ripple (unsteady voltage) going to the load ....something an atty really does not care about because it is acting like a resistor.
The input cap's main reason for being there is to filter out any ripple going to the chip (there is no AC in a battery). The second reason for the input cap is to take the "shock" off the chip when you first turn it on (like when you hit the fire button).
In a mod we hit the fire switch a lot. I did talk to a TI engineer and after he heard what I was using it for...... I was told that "TI still recommended that I use both chips", you understand he had to say that BUT, if I wanted to go "outside" of the specs.... The output is needed less than the input for our application.
The way we are using it in a e-cig.... the input will help to extend the "life" of the chip by taking the shock off the chip.
I just received another chip yesterday and I am going to build this one without any caps. I will see if the deletion of the chip make any difference in hit, battery life, or life of the chip.
Thanks for your reply BB!
Do let us know of the outcome of a setup without the caps. It would be fantastic if the difference in performance is minimal. honestly, i would be prepared to sacrifice the performance for a potentially smaller mod!
Do let us know of the outcome of a setup without the caps. It would be fantastic if the difference in performance is minimal. honestly, i would be prepared to sacrifice the performance for a potentially smaller mod!
I am planning on making one of these myself(ti chip should be here tomorrow). I am wondering if it is necessary to adjust the POT to maintain a constant voltage throughout the variation of the charge on the batteries.
Well that'll sure save me some time. Are you planning on doing the same thing with your second?
I do not think I will do the MOSFET yet. I have a supply of some really good N/C, N/O single package switches that I have been using. I will use one of those in my second one............ My lovely wife ordered me a digital Weller soldering station ( without me asking) and it should be here tomorrow.... I want to wait to use the new toy for my second one.
I do love that lady....
Well my madvapes order is in the mail, so my batteries and switches should be here in a few days. In the mean time I'll hook everything up to the breadboard and make sure it all works in practice the way it does in theory as my mouser and TI shipments should be here today.
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It you have any question, please ask. I do not know how many mods you have made, but I think you will really like this chip. I think it is much better than the
TI 383-adj chip.
TI 383-adj chip.
I think that's the way to go. I tried building it with the mosfet, and just adds more stuff to cram into an already small space. As much as I like the smaller switch, this mod is tough enough to build without the added difficulty.
Well one thing to consider. Most multi amp rated switches are much larger than their low amperage rated counterparts. Mosfet + low amp switch in many cases won't be much bigger than a high amp switch is on it's own. Of course there's going to be exceptions all over the place where you find bulky low amp switches and trim high amp, but just throwing that out there.
It's not the switch, it's the extra wiring that goes along with it when you add the mosfet that takes up the extra space. I'm sure someone with better electric skill than I can work it, but I found it just too much extra stuff to add into an already small space.
Waaah! How'd you get another chip?! Waaaahhh!
A thought occurs: If I'm telling TI that I'm an engineer for a small consumer electronics company using their sample chips to test in my prototypes, and they only let me get 5 of this or 1 of that, what's to stop a friend, neighbor or family member who owes me a favor, or wants a favor, or a free mod, in return, from doing the same? That's how I'm thinking I'll get 'extras' after using up my free samples...
I got my chip! 
I got my chip!- Status
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