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Breaktru Forum  |  eCigarette Forum  |  Modding  |  Topic: Potentiometer and Usb Charging Board Help
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Author Topic: Potentiometer and Usb Charging Board Help  (Read 6994 times)

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Offline vapetech334

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Potentiometer and Usb Charging Board Help
« on: September 15, 2015, 05:37:35 PM »
It's come to my attention that no one in the United States stocks d Vishay p 16 200 ohm potentiometers both Mouser and digikey only carry the 100 and then the next reading is 470 I currently have a 470 is there any way to add something to make the 470 perform like or @ 220 or 200 Ms or does anybody have a suggestion for a nice 200 or 2:20 pot I'm currently working on a Raptor 20 amp PCB mod with a carbon fiber enclosure and the mod meter..
Edit:
The Pot should lower the min voltage, so it shouldnt make a huge difference right?



 also does anybody have any suggestions on a good one amp micro or mini USB charging board

do any of these usb charging boards seem good enough
http://www.ebay.com/itm/5V-Mini-USB-1A-Lithium-Battery-Charging-Board-Charger-Module-Box-Mods-Free-Ship-/231545775327?hash=item35e93424df

or
http://www.ebay.com/itm/Micro-USB-1A-Li-ion-Charger-Board-18650-Lithium-Battery-Charging-Module-protect-/231677358928?hash=item35f10bf350

or
http://www.ebay.com/itm/Mini-USB-TP4056-1A-lithium-battery-charging-charging-module-form-AZ-USA-/181812476805?hash=item2a54de3b85

is reverse polarity protection really that important?


Thanks in advance guys
« Last Edit: September 15, 2015, 07:30:51 PM by vapetech334 »

Offline MonkeyTokes

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Re: Potentiometer and Usb Charging Board Help
« Reply #1 on: September 16, 2015, 12:04:30 PM »
As far as a charging board goes any one will do as long as its the size you need. I get mine from fast tech, they have a ton go choose from and are super cheap.
As long as your confident you won't put the batteries in backwards there's no need for reverse polarity protection. I dont use it. Then again I've had two idiots fry the OKL by putting their batteries in wrong so in the end its pretty much up to you and your confidence in getting it right every time.
« Last Edit: September 16, 2015, 04:47:24 PM by MonkeyTokes »

Offline iusedtoanalog

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Re: Potentiometer and Usb Charging Board Help
« Reply #2 on: September 16, 2015, 01:46:16 PM »
Hi Vapetech,
As far as modding the 470pot you have there you could parallel another 470 to the two legs of the pot to give you a final high resistance of 235...... but when you are adjusting the pot you will notice that the response curve is different than it should be..... In my opinion you should just get the correct pot. I have tried the above and it did work but the output was noticeably wrong so I pulled it out and waited a couple days for the correct parts to arrive. This is the one I have been using for a few years worth of Raptor builds : 3352W-201LF from Bourns, Its is much more space friendly than the volume knob you have listed, and can be turned without having a tool.

None of those chargers you have listed will work unless you are going to build a separate circuit to parallel the batteries in the mod just for charging. The Raptor mods use the two+ batteries in series, so you will want a balance charger or to remove the batteries from the mod for charging on a desk charger.... This is also and option if you want an onboard charger for the two batteries in the mod : http://www.varitube.com/YiHi-9V-Balancing-Charger-Board_p_179.html but I have never used it so I cant say how well it does or does not function, or how safe it may or may not be.

Reverse protection IS not hard to achieve, for fool proof reverse you just need a small mosfet. This is the one I have used for quite some time :  IPD042P03L3 G from Infineon Technologies. It is very small and works flawless. I have destroyed 3 different mods by inserting batteries in reverse, until I began wiring this simple little mosfet into my builds....... Never had another issue after that.

Offline vapetech334

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Re: Potentiometer and Usb Charging Board Help
« Reply #3 on: September 16, 2015, 08:52:33 PM »
I don't suppose running two positive and two negative leads one pair to each battery would work would it? Otherwise I'll be getting the varitube yihi balancing charger....I didn't check but does that support lipos

Offline doobedoobedo

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Re: Potentiometer and Usb Charging Board Help
« Reply #4 on: September 16, 2015, 09:05:05 PM »
Almost all lithium cells use the same charge algorithm, so if it charges round cells it'll charge LiPos too.

Offline david4500

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Re: Potentiometer and Usb Charging Board Help
« Reply #5 on: September 16, 2015, 11:52:48 PM »
470 pot + 220 ohm trim resistor low output voltage would be 2.3v

http://www.wolframalpha.com/input/?i=470%2B220%3D1182%2F%28V-0.591%29

Offline vapetech334

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Re: Potentiometer and Usb Charging Board Help
« Reply #6 on: September 17, 2015, 08:49:17 AM »
Ok so my low end of my pot would just be super low but my high end would be ok right? That's what the guy that sold me the pot told me.
Where do you get the 1182 and 0.591 figures
Also could anyone point me to a good 200 or 220 ohm pot that has a knob or a pot and compatible shaft and knob.. I'm having the hardest time find them

Also no one answered as to wether or not I could take two positive and two negative leads off the usb charger to recharge
 
Thanks
« Last Edit: September 17, 2015, 08:52:51 AM by vapetech334 »

Offline david4500

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Re: Potentiometer and Usb Charging Board Help
« Reply #7 on: September 17, 2015, 08:18:58 PM »
High end output voltage would not be changed by a different pot value. The value of the trim resistor, 220 ohm typically, sets the high end.

220 ohm trim resistor you get 5.96v for your high output voltage.

http://www.wolframalpha.com/input/?i=220%3D1182%2F%28V-0.591%29

Ge Raptor NSR020 data sheet page 14 has the trim formula

http://apps.geindustrial.com/publibrary/checkout/Data%20Sheets%7CNSR020A0X%7Cgeneric

Offline david4500

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Re: Potentiometer and Usb Charging Board Help
« Reply #8 on: September 17, 2015, 08:35:43 PM »
Also no one answered as to wether or not I could take two positive and two negative leads off the usb charger to recharge

No for batteries configured in series.

Offline david4500

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Re: Potentiometer and Usb Charging Board Help
« Reply #9 on: September 18, 2015, 11:34:46 AM »
For a pot with a knob, check out what I have posted here: http://breaktru.com/smf/index.php/topic,907.msg16973.html#msg16973

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