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LTC1871 board testing
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thejewk Offline
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Post: #1
LTC1871 board testing
http://www.ebay.co.uk/itm/3-5-to-30V-100...3a8ef2c043

Got one of these out of curiosity a month or two back and it has been sat waiting for me to get the soldering iron out.

It is a boost board, and has no buck feature, so VV from 4.2 volts up.

It has a 6 amp limit, 100 watt max output, all components on board, voltmeter that reads input and output voltage and an onboard potentiometer.

The 100 watt is clearly for very high voltage inputs coupled with very high resistance coils, so not really good for the things we are looking at.  Also it's not for sub ohming.  I haven't yet tested what the lowest coil it fires at is, but I don't think I will bother to be honest.

I quickly wired it up with a single 18650 battery cradle, pos to a switch and then the pos in of the board, and negative to the neg in on the board.  Then I just connected board outs to the pos and neg of the 510 connection.

It was set to 20 volts on startup so I test fired my Atomic coiled at 1.2 ohms and it switched down to 7.2 volts, exactly what I expected for the 6 amp limit.

I was concerned about how hot it would get after looking at the giant heat sink fitted on it, but after a good session it only had a little faint heat, nothing to be concerned about.  The only real heat was from the atty, which you would expect from vaping at 30 watts.

There are obvious negatives, the size being one and the form factor of it being another.  You can't easily mount it and get external access to the screen, mode button for selecting voltage in and out, and the pot.

This is going into a tobacco tin with USB charging, but I think I will look for a 1oz tin and see if it will fit in that before I put it in the pound shop Rizla 2oz tin I have knocking about.

Either way for £6, and based on first impressions, it seems a bloody good board that should be easily capable of 50 watt vaping on a 1.4 ohm build.

In fact, not including tools, you can make a single 18650 USB charging powerful mod for less than £30.

Obviously I am going to be testing this over the coming weeks, and will let you know if any cracks appear.
05-05-2014 06:25 PM
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gords1001 Offline
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Post: #2
RE: LTC1871 board testing
Nice report bud. Seen our kid today, he mentioned (endlessly) that you had some new toys.

I'm hoping to get some bits together next month to start playing, I've picked my timber up from my dads this weekend though, I'm hoping to get one of those sx350 boards to play with soon. Got high hopes of that board.
05-05-2014 08:55 PM
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JohnnyMac Offline
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Post: #3
RE: LTC1871 board testing
Really, really cool, jewk!  Looking forward to more  word as you get more experience with it.  Seems pretty unreal for the price. Smile
06-05-2014 12:51 AM
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Spasmod Offline
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Post: #4
RE: LTC1871 board testing
Pretty cool actually, I'm looking forward to seeing how it turns out in a build.

I doubt you could move the Pot due to wire resistance but the display and the switch could be moved easily enough to better fit your application most likely ?
06-05-2014 11:45 AM
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18sixfifty Offline
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Post: #5
RE: LTC1871 board testing
Good stuff, I'll also be checking back in to see how this goes. 

If the natural tendencies of mankind are so bad that it is not safe to permit people to be free, how is it that the tendencies of these organizers are always good? Do not the legislators and their appointed agents also belong to the human race? Or do they believe that they themselves are made of a finer clay than the rest of mankind?
06-05-2014 05:06 PM
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thejewk Offline
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Post: #6
RE: LTC1871 board testing
Unfortunate news. I think the board is unnecessarily stressing the batteries and causing an ass load of drop on a perfectly fine cell under load. A lightly used sony vtc4 which shows very little drop in most applications was just dropping to 3.1 volts from 4 firing a 4 ish amp test situation. The display started to blink and give less consistent results. 

Worth a try. 
07-05-2014 06:22 PM
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Spasmod Offline
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Post: #7
RE: LTC1871 board testing
That's a shame. There's usually some loss in a boost circuit due to inefficient design and some loss that can't be avoided but that does really seem excessive.

Thanks for taking the plunge and trying something new though. We appreciate the feedback Smile
07-05-2014 11:40 PM
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thejewk Offline
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Post: #8
RE: LTC1871 board testing
I was thinking about this a bit more and can't help feeling that it might be decent if used with lipos or the like at 4.2 volts. It takes a lot more to stress those out and you could end up with something rather tasty. Unfortunately I don't have the required gear. 

Graham, you want the board to have a play with? 
09-05-2014 05:27 PM
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gords1001 Offline
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Post: #9
RE: LTC1871 board testing
Could do. I think my lipo packs are 14.4v thoughDiabloDance3
10-05-2014 03:29 AM
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