Read What Others Are Saying

This item is very cheap, and the quality is good, I like it.

This is a great kit for the price, and a nice way to practice surface-mounted soldering skills. Pros: 1) If you want to have multiple displays aligned vertically, then this is the kit for you. The circuit board is the same size as the display, so you can place the displays side-by-side with no gap. 2) The jumpers used to chain multiple displays are much easier to work with than cables 3) The downloadable documentation is excellent. Cons: 1) There are no mounting holes in the circuit board, so you'll have to be creative when hanging these on a wall. 2) The pins used to connect multiple displays with the jumpers are intended for vertical alignment, not horizontal. In other words, if you want to display text vertically on multiple displays, you'll either have to connect them with cables, or change the software to rotate the text. 3) The solder pads for the SMT chips are a little too tight, making it challenging to solder. So, there is some room for improvement, but overall this is a high quality kit for a very good price.

This cube is amazingly good, works perfect. If you want to buy this, you NEED to have good soldering skills! Please look on the yellow cube's page to get the instructions on how to make the cube!

First off, the shipping was very fast and accurate. I just received these yesterday. I couldn't wait to play with them. I was able to assemble them in just a couple of minutes. They are awesome and work just as described. Also the price is pretty much the best I have found.

Very good product! You can get almost any voltage in range above input. for example from 5V you can get any of 5-25V. Actual size of module: 37mmx17mmx8mm (LxWxH)

What a great device! I bought 3 of them but I was concerned about the 2X voltage comments before the modules arrived. I needed 9V at 100 mA current out of a 3.7 Volt Lion battery on the input. First, the quiescent current is only 450 microAmp at 3.7V, just amazing for a switching supply. Next, the the output did not vary with an input voltage change from 3.7V to 6V. From no load on the module output to 75mA load, the device only dropped 5 millivolts... I didn't really try to fully characterize the device but was pleased to see when I cranked up the pot, the voltage went well above 12V using the 3.7V battery. I could not ask any better performance than that for my application!

Bought two devices. Nifty controller for moderate current requirements. I used it to drop 12VDC to 9V at 2 Amp and the switch got hot - well above 50C. Seemed to allow 1 Amp with no heat sinking and remained under 50 C. The switch IC uses 42 small (30mil?), copper foil dots on backside as a heatsink. You need to get a heatsink onto the device tab which is hard to do to run moderate current. The module is nice in that the quiescent current is about 5 mA.

The input/output capacitors look too small to be 22uF/35V. My guess is that in order to reach maximum current you would have to connect good low ESR capacitors (at least 22uF - as in datasheet) in the input and output

For this module, the dc output is about 2 times that of the dc input, i.e. if you input 2V dc, you can get a maximum of about 4V dc output and don't expect to get 5V or more no matter how the onboard potentiometer is adjusted.. Furthermore there is no heatsink for the small IC which gets hot with an output current of about 400mA only. As it gets hot the output is unstable. Definitely this module would not produce a maximum output of 2A as specified in the electrical characteristics of its description. Also the efficiency is about 80% and not as high as 93% as stated. All in all, for a light load of about 250mA and with a dc input of about 2X, this module may suit its purpose.

Thanks, the goods have to hand. In accordance with the booking, but a little unfortunate, there is one item (ic A3967 / A1013) is not the same as the other 4 ic goods. If it's worth the MAX7219 is not a problem for me. Thank you very much