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Old 01-08-2013, 09:00 PM #1249
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Default Re: FREE DIY open source BOOST driver!!! Tested & working!!

The mosfet disconnects the circuit if the battery is inserted the wrong way.

Unfortunately switch current is not equal to output current. The switch current is the input current. The lm3410 has an average of 2.8 max switch, a lot of times it is higher but it can be lower too. With 2.8A max input, 3.7v supply, and assuming 80% efficiency we have 2.8 * 3.7 = 10.36W input, and 10.36 * 0.8 = 8.29W max output. An m140 has a Vf of 4.5v, so our theoretical max into an m140 is 8.29 / 4.5 = 1.84A. The max current changes with heat though. Cold the efficiency can be a lot better than 80%, and a lot worse hot. Heat increases resistances, which drops more voltage, and makes more heat. Also heat increases your set resistors making the regulated current go down.

So that's why the mini design was so focused on being effectively heatsinked, and why it ended up being so much more capable than the original. I feel like they should all do 1.6A with good heatsinking.


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Old 01-09-2013, 03:32 AM #1250
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Default Re: FREE DIY open source BOOST driver!!! Tested & working!!

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Originally Posted by Mohrenberg View Post
just go to oshpark and upload the .brd file, follow the instructions and place the order.
Oh, duh! I have always used Gerber CAM Zips. EDITED I have been told that I am really good at soldering SMD and just soldering in general, so is anyone "mass producing" these? If not, I would be willing to, provided that I can get a sure client base.

Thank you!

Last edited by saleenman; 01-09-2013 at 03:36 AM. Reason: My own stupidity...
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Old 01-09-2013, 04:06 AM #1251
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Default Re: FREE DIY open source BOOST driver!!! Tested & working!!

Thats been taken care of.

Matt is getting parts for 500 boards!
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Old 01-09-2013, 11:07 AM #1252
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Default Re: FREE DIY open source BOOST driver!!! Tested & working!!

Awesome!
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Old 01-10-2013, 02:51 PM #1253
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Default Re: FREE DIY open source BOOST driver!!! Tested & working!!

My advice is keep the cost down Osmosis. Ben Is right . Don't ever try tin can and propane.
If your skillet is well trusted, use it don't spend 1 K for the plastic welder. You have to watch out for the cooling curve that has been discussed.
Mass production , well leave it to the professionals. The have invested a lot of cash on their equipments, which is out of range for us. But if you want to go the professional way be prepared to spend.
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Old 01-10-2013, 03:25 PM #1254
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Default Re: FREE DIY open source BOOST driver!!! Tested & working!!

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Don't ever try tin can and propane.
Jeez, you people are picky!
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Old 01-11-2013, 11:58 PM #1255
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Default Re: FREE DIY open source BOOST driver!!! Tested & working!!

Hi could you please tell me from which device I can salvage the lm3410
IC cause i can't order it online and it's not found in my country
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Old 01-12-2013, 02:45 AM #1256
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Default Re: FREE DIY open source BOOST driver!!! Tested & working!!

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Hi could you please tell me from which device I can salvage the lm3410
IC cause i can't order it online and it's not found in my country
pfft good luck with that!

Tell you what, I'm planning to order some parts fairly soon. I could order a few extras for you if you send me your address plus my costs. PM me if interested.
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Old 01-12-2013, 03:55 AM #1257
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Default Re: FREE DIY open source BOOST driver!!! Tested & working!!

Sure give me one second, ill just pull up every customer that has ordered one from digikey or mouser, find out which ones manufacture products for sale to the public, buy every product they make and 1 by 1 disassemble them until I find a lm3410.
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Old 01-12-2013, 04:04 AM #1258
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Default Re: FREE DIY open source BOOST driver!!! Tested & working!!

LOL.

You can find some useful stuff for drivers in random things though. Back when I was a noob i found an sot89 lm1117 in a broken DVD player and used it to make my first driver for a DVD burner diode.
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Old 01-12-2013, 04:16 AM #1259
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Default Re: FREE DIY open source BOOST driver!!! Tested & working!!

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Sure give me one second, ill just pull up every customer that has ordered one from digikey or mouser, find out which ones manufacture products for sale to the public, buy every product they make and 1 by 1 disassemble them until I find a lm3410.
don't forget to use a tin can and propane torch.
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Old 01-12-2013, 10:49 AM #1260
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Default Re: FREE DIY open source BOOST driver!!! Tested & working!!

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pfft good luck with that!

Tell you what, I'm planning to order some parts fairly soon. I could order a few extras for you if you send me your address plus my costs. PM me if interested.
I live in Iraq so the shipping would be too much...I found an op-amp in an old pc motherboard and found lots of lm1117 and made drivers with them but I don't like the power loss and the pot is getting burning hot when I use it don't know why I'm not good with electronics
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Old 01-12-2013, 07:25 PM #1261
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Default Re: FREE DIY open source BOOST driver!!! Tested & working!!

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.I found an op-amp in an old pc motherboard and found lots of lm1117 and made drivers with them but I don't like the power loss and the pot is getting burning hot when I use it don't know why I'm not good with electronics
P=IV. You must be pushing lots of current through the pot. A trimpot isn't designed for carrying a large load, it's for small signals. If you need to control current like that, use a transistor or MOSFET amplifier.
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Old 01-16-2013, 09:18 PM #1262
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Default Re: FREE DIY open source BOOST driver!!! Tested & working!!

http://laserpointerforums.com/f55/gb...ini-79658.html

Doing a group buy sort of thing for the benboost mini V5.
If you're just looking for the parts and board, there is a kit option, which is cheaper than buying the parts yourself.

we need to get around 100.
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Old 01-23-2013, 02:42 PM #1263
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Default Re: FREE DIY open source BOOST driver!!! Tested & working!!

Osmosis.

The reason behind tin can and propane is you have no way of knowing and controlling the temperature.
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Old 01-23-2013, 04:29 PM #1264
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Default Re: FREE DIY open source BOOST driver!!! Tested & working!!

uhm it was a joke.
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