MiOYOOW DIY Calculator Soldering Practice Kit, 7 Digits Desk Calculator Kit with 1602 LCD Display, DIY Soldering Electronic Project Kits for School Learning and Home Office Daily Use

I had fun putting this kit together. I've soldered many little kits like this and im happy to say I have been using the calculator on my desk for small calculations. To make something functional and useful and then actually use it in your daily life is a cool feeling. While this is no TI-84 the backlit screen and bonus functions make this a lot better than store bought calculators in the same price range ($10). The only downside is the batteries are really hard to access if they need to be changed - you need to take the back off and screen out to change them. I am thinking of soldering some wire to the leads of the battery connectors to move the batteries to a more accessible place. Overall, its a fun kit but I do recommend you have soldering experience before attempting.

This was mostly easy to assemble and works as advertised (including calculating resistor values by color codes). The final result is far from a quality calculator, but neat nonetheless. All components are thru-hole and soldered easily.Assembly into the provided clear casing can be fiddley as the nuts and screws are tiny. You need to loosely attach the PCB to the bottom shell, then place the case sides before finally securing the PCB fully. If you tighten down the PCB before attaching at least the USB port case side, you won't be able to get it on.The biggest negative for me is lack of instructions. It wasn't complicated to complete, but not knowing the case assembly steps made me have to back up a few steps to complete assembly. The QR code on the provided sheet (a parts list and basic electrical diagram) takes you to their Amazon store, not a "detailed manual" as the text notes. If you're even slightly familiar with PCB kit assembly (or watch a couple of YT vids), the lack of instructions shouldn't be an issue. The only directional components are the MCU/IC socket and led digit displays. Both of which are easy to figure out (the decimal dot on the LCD displays is oriented towards the bottom, the IC socket notch should match the silkscreen on the PCB).

Funcionó perfectamente, buena calidad

I've done a few kits with my kid since getting him into DIY electronics, so he's not a complete beginner, but despite this we both had a little difficulty getting this put together; it's a nice concept, and the resistor calculator is great for future projects, but I can see where someone newer to soldering might end up having a much harder time...Like other reviewers, the first thing I noticed was that the key labels are just paper and part of the instructions themselves that need to be cut out at just the right size to fit (after having read all the instructions themselves of course). This could've been a sticker sheet or something similar instead, and would be much less trial and error. The components themselves are cheaper, but don't hurt the overall assembly for the most part, with the exception of the keys themselves, which need to be perfectly centered with enough freedom to allow for a full keypress - much easier in theory without having to hold multiple pieces steady while upside down and solder at the same time. You'll almost definitely want a helping hands or similar to keep everything in place as much as possible.I don't know if id really recommend this set to total beginners, or at least not without the supervision of someone who knows a good deal themselves - and the patience to go back over cold joins and the like!

These days, who needs a calculator when you've got one built into every smartphone? This one, however, does something no other pocket calculator does (at least not any I've seen): punch in the color bands on an electronic resistor and it will tell you the resistance value and tolerance. If you're an electronics hobbyist with a box of random resistors on hand, this thing is great. Assembly is a tedious process (since all of the key switches have to be soldered to the board in addition to the other components) but other than a minor bobble in soldering (bridged two pins on the IC socket, had to fix that) it went smoothly.

My review is different from the others because I actually put the kit together.Everything looked great until the last step which is fitting the soldered components and PCB into the black ABS case. This is when everything went sideways. No matter what I tried the key caps would not fit correctly into the grid allowing me to close the case.There are 20 momentary switches that act as the keypads. Each switch has four legs that are simply soldered via through holes. There is very little tolerance when soldering this into the PCB. I tried desoldering and resoldering them to get the grid to line up. No dice! At least three of the switch key caps would get pinched in and not sit correctly in the grid. This would result in a pad being permanently pressed. They all have to be free to move or it shows an error.I ended up cutting out the grid with side cutters and it still wouldn't free up the caps. The only thing that worked was to dremel the four corners. By now the case looked terrible.I will most likely not use this for anything other than a novelty. It will be displayed WITHOUT the plastic top case.Another shortcoming is that you have to cut out the numbers and symbols that go under the clear key caps. This is step 13 & 14. They cheaped out and are simply printed on the back side of instruction sheet. Cutting these out removes steps 16 & 20 from the front side. A nice set of pre-scored card stock numbers would have been great!The componentry is very well done and is a great tool for teaching someone to solder. However, I can't recommend this for the other shortcomings.

I ordered this kit to learn how to solder and at the end I have a working calculator. There are a few spare parts and because some of my solder joints were not great it was hard to put together, but I would say it is exactly as advertised.