OK, OK,, maybe not half but our local postage stamp with 3 day delivery is AUD$1 now.
This DC/DC up converter rated at 2 amps is US$0.49 DELIVERED!!! I just had to order 10 pieces... 
http://www.aliexpress.com/item/M...
Ross
Half the price of a local stamp
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And try and get 30c stamps to go with your stock of existing 70c stamps.
I just tear a 70 in half... they can keep the extra 5cents.
That is a great deal seeing as how the company listed on the back of the unit wants almost $3.00usd for one unit. Plus delivery
JIm
Nice. Too bad the enable pin isn't exposed.
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For US$0.49 I am willing to do some surgery on the enable pin myself.
Wonder if you can run a 12v water pump on two AA cells with one of those units? 
Jim
depends upon the water pump. The one I just rescued and tried in my water storage tank draws 5.4 amps at 12 volts.
Is this just me forming conspiracy theories, or is the trim pot saying "BONENS" in the same typeface thar "BOURNES" use?
Our normal letter just went up to 19 DKr =2.55 €
JohanEkdahl wrote:
Is this just me forming conspiracy theories, or is the trim pot saying "BONENS" in the same typeface thar "BOURNES" use?
Ah yes - the good old Chinese "equivalent part" - it's great how they can make such great quality items for such low prices.
Reminds me of a job I did last year for a company in England.
They had fitted mains-fed Dual 2.1A USB Chargers beside the bed in every room in a big hotel.
A significant number of the chargers had failed in a short time. Just no output from them. The manufacturer was a reputable UK manufacturer who had supplied many thousands of these to hotels all over the country with no significant fails.
So an argument was brewing between my client and the manufacturer. The client claiming they had been faulty, the manufacturer claiming they had been damaged in fitting.
Anyway the client sent me samples of some that had failed, and some that had not failed and I examined them all.
All the ones that had failed had ever so slightly different markings on the power diode - the same markings as the others, but just not as clear, or silk-screened instead of laser etched.
I took photos of all the diodes and sent them to the manufacturer... yes you are ahead of me now.... all the failed ones were fake, the non-failed ones were genuine.
The manufacturer had had the devices manufacturer in china for a long time, but just this one batch had some counterfeit components in just some of the devices.
The manufacturer was really very good about it an paid for an electrician to visit every single room and replace all the chargers. It worked out at about £50 per room, which was more than the chargers cost!
An all too common story unfortunately. There was a whole batch of solar inverters that were dropping like flies out here. It all came down to a 1A schottky diode failing that really shouldn't fail and it caused a cascade a destruction that rendered them uneconomic to repair. There was no happy ending - a few peole got caught with dud inverters.
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I don't see anywhere he specifies the input and output voltage ranges.
If you don't know my whole story, keep your mouth shut.
If you know my whole story, you're an accomplice. Keep your mouth shut. 
Torby wrote:
I don't see anywhere he specifies the input and output voltage ranges.
From the actual home page of the product:
1.Electrical characteristics
1). The maximum output current: 2A
2). The input voltage: 2V ~ 24V
3). The maximum output voltage: > 28V
4). Efficiency: > 93%
and...
3.How to use it?
[...]
- Adjust the potentiometer to adjust the output voltage. Please be noted that the output voltage should be higher than the input voltage.
and...
4.Notes
1). The input voltage should not exceed the maximum input voltage
2). The peak current output current should not exceed maximum output current
Point 4.1 is kind of a "Duh!"..
Last Edited: Fri. Jan 8, 2016 - 02:10 PM
Note Quantity available 999k+!!! I wonder if that was a slight manufactures overrun on production, like someone missed the "." or "," depending on where your from, on the order form.
Jim
I was going to look up the part and make some post like "I can't even buy the part for that". Google found the datasheet from Aerosemi. But put mt3608 into Octopart or Findchips and they aren't available to mere mortals.
My 10 units are on the way... will let you know how they perform when they get here... "couple of weeks"
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Might go for that myself. But then, they'd probably ship it to an address I had years ago. (Been having trouble with that.)
If you don't know my whole story, keep your mouth shut.
If you know my whole story, you're an accomplice. Keep your mouth shut.
JohanEkdahl wrote:
Yeah, I too noticed the name on the trimpot. I don't think it's an attempt to deceive the end user - I would think that anyone who cares about the quality of their trimpots will know the difference between bournes and bonens. However, I do think that bonens are trying to evoke an image of bournes-like quality. It's similar to the way nearly every multimeter comes in a yellow holster in an attempt to associate with fluke (of course, that ended in a silly kerfuffle at sparkfun a few years back).
Is this just me forming conspiracy theories, or is the trim pot saying "BONENS" in the same typeface thar "BOURNES" use?
- S