Great dc-dc. It gives approximately 500ma, If you try to increase the current consumption - the voltage drops. Efficiency is 82% (calculated by me) when supplying 500ma, and Vin=3.8V. You can put 2 or more of these in parallel to get very fast and efficient phone charger. Requires knowledge of electronics :).
Also cannot turn off a led when there is ... Read more
I've tested this module with a few devices and can confirm it works with the following:
Most android phones
Most non smart phones
Most USB devices I've ran it for over an hour during tests. My phone pulls about 1A while charging and the module was only slightly warm. It could probably handle 1.5A if you pushed it. It does not charge any Apple devices ... Read more
-Fairly solid build quality
-Red LED confirms circuit is working
-All solders look good to me
-Works with many different batteries
-Delivered a good 4.9-5v
-Solid USB connector -Wasn't powerful enough to charge my ipod touch (4th gen) or Nexus 4, however was able to charge my iPod video (5th gen) Mine came in it's bag with a little black ... Read more
- Small, easy to use
- Stays cool enough to put in an enclosure without worrying about overheating - LED is on as long as power is applied; cannot be used to indicate charging is active. This may or may not be a bad thing.
- The top of the coil chips easily, however this does not appear to affect the operation. One of three arrived chipped, with a small ... Read more
- Really works; - Fine regulated out, it's pretty accurate 5v; - You can recharge your phone or whatever from a single AA battery or any other supply, like a solar panel; - It's small; - Fits everywhere, seems great to embedded projects; - It's hard to attach it to a box or anything like this, because it doesn't have screw holes; - Bad finish, you can ... Read more
- It's cheap. - It has good build quality. - It's small. - Voltage drops when heavy load is applied. - The LED mounted on the board cannot be switched off to save precious milliamps when needed. I bought this for my solar panel (3.4 volts at 40mA) to experiment. My expectations were this thing to supply solid 5V no matter the load. This is not what ... Read more
Very good dc-dc step-up converter. I use it for powering my smartphone when use hiking navigating software. I bought a 18650 battery holder case to power this module.
It is possible to power module from any battery, but then input current will be higher.
Usefull as a DIY emergency battery for USB powered devices. To use it as a dedicated USB power source ... Read more
Great gadget for a very reasonable price.
I use this step-up booster to transform the voltage of 3 solar panels (about 1.5V) to 5V.
The current however is insuficcient to charge my smartphone. Most other devices charged well. (I think maximum current at 1.5V input is about 500mA) Difficult to attach to something, since there are no holes in the PCB.... Read more
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