EverCool Variable Voltage Mod
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Frack, that does make one cringebut does it HIT like a hammer
Oh yeah, it hits great!! I need to use a different pot on the next one to make it easier to change voltage.. The Infinity Pro has me spoiled for VV. This was so much fun to build, I cant wait to build a million more
I'm just going to go out on a limb, maybe the batteries would have fit if it weren't for the meter? Tough call from these pics, can't tell about depth.
The batts could have fit inside, but with my huge 3amp switch, volt meter, a odd sized 1k pot and the caps I had originally planned on using were 35v electroltic (huge) It was too much to get it all in there. Being my first VV mod with the TI chip setup it was a big time learning experience. My next mod will definitely be a lot less awkward and more professional looking.
Oh yeah, it hits great!! I need to use a different pot on the next one to make it easier to change voltage.. The Infinity Pro has me spoiled for VV. This was so much fun to build, I cant wait to build a million more
love the enthusiasm, wish i had the time/energy to put some of my electrical engineering degree to use like this
Yeah, definitely respect for seeing it through and for creativity. If it hits right, looks are a moot point.
Awesome jimbalny! I was wondering about how to do an n/c on the inhibit. Thanks for posting that. If I can finish up this first project without screwing up too bad, maybe I'll give your design a go.
Try it out on a breadboard, take two wires with stripped ends, touch em together from the inhibit and the ground. When u pull them apart u get voltage. I am working on making a normally closed mechanical switch, shouldn't be too hard to make it so it BREAKS a connection on button press. I actually have a few 120/277v rated nc switches from emergency light/ballast test switches (think, it normally has power and when u press the button it cuts it like the power went out hence testing the backup lighting). They have a nice feel to them, nice and springy with a little clickage - just a little big though (take up a little more than double that of a horn switch).
do you need to have it be vari volt or can u just wire it straight with out the adjuster? i have the PTR08100W, but thats it n little know how, ? help
do you need to have it be vari volt or can u just wire it straight with out the adjuster? i have the PTR08100W, but thats it n little know how, ? help
If you just want to have the evercool "locked in" at 5 volts. You need to put a 268 ohm resistor from pin 3 to 5. Then you do not need the variable resistor or the resistor. On page 8 of the TI spec sheet (data sheet) you can see the other values for output voltage.
The spec sheet is here.... Plug-in Power Module - Non-Isolated POL - PTR08100W - TI.com
Okay i have a few q's? as I await my parts to arrive, still need to order more parts hence the questions.
The voltage drop out..... So when I change the batteries will I lose the volts I had it set to prior to changing them?
If yes I will, does changing the pot from say the blue one to the wheel one make a difference? Does the wheel pot keep voltage when changing batts?
Space..... Would a 4aa bat box house the chip, batts and voltage reader?
Batteries.....14500 or 18650's?
Thats about it for now thanks for the upcoming response.
The voltage drop out..... So when I change the batteries will I lose the volts I had it set to prior to changing them?
If yes I will, does changing the pot from say the blue one to the wheel one make a difference? Does the wheel pot keep voltage when changing batts?
Space..... Would a 4aa bat box house the chip, batts and voltage reader?
Batteries.....14500 or 18650's?
Thats about it for now thanks for the upcoming response.
Im still really new to these regulators but from what I have experienced is that as for changing your batteries you will still be where your voltage was set. Changing the pot wont make any difference to keeping the voltage where it was. A pot is a pot is a pot, they all function the same. A 4aa battery box will definitely house all your components. As for batteries you can use whatever you want. This chip has an input voltage range from 4.5 to 14 volts. So If your planning on using a aa sized box just use 14500's. But I wouldn't use more than 2 batteries because the undervoltage lockout might not kick in till your batts are too undercharged which could cause battery failure.
Although I could be wrong about the UVLO so someone please correct me if im wrong.
Cool thank you for your response. I was hoping I didn't have to adjust voltage every time I needed to change batteries.
I tried to stick the evercool chipset into a "puck style" mod that I made. It uses 4 AA NiMh in one box and the other box is the control. As it is .. the fire button lights the led as the atty gets power. I tried to unsuccessfully put the evercool chipset in and failed somehow. Now for round two I would like to know if I can use a wheel pot for voltage adjustment... if so what pins on the TI need to get connected to the pot... the pot is 5 pin with 2in and 2out w/ground. also can i use a pcb that isn't stripboard? I just unsoldered everything I had on my first attempt and have the parts ready to try again. As is the voltage is 4.8 with 2200mah. This should work?
The pot is connected from pin 3 to pin 5. Pin 3 is the pots wiper I believe. You'll have to test your pot with an ohms meter to figure out which 2 pins you need on the pot. As for 4.8 v in, that should work, but probably wont last long, once the voltage in the batt goes below 4.5 it will not run the chip due to the UVLO.
Thanks... Oh well time for a new build ! I know a few people that may take the one i just made off my hands... Im thinking using two old auto stick batteries (4108?) . Once I get inside I can figure out voltages etc. This could make for a small mod with li-ion batts insted. thanx again.
For unprotected battss that could be true. IF you're using protected batteries the batteries own min voltage limit should kick in. As soon as that happens the two batteries in series go to 0v overall.
The 100uf capacitors for this mod do they have to be 10v or can they be bigger like say 16v-20v? and any 200 ohm pot will work right?
The bigger the voltage rating the better. The trade off is usually size however.
Just make sure the pot is 200ohm and not 200K or 200M.
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It might be in this thread or another thread, but someone said to make sure your capacitors voltage rating is at least twice you input volts. So if you do 2 14500's which is about 8v, use 16v caps.
Nice okay starting to make sense.
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