FM Radio Kits

I got this radio kit to teach my 12-year-old sister how to solder and assemble as a way to teach basic electrical engineering principles and terms. Upon unboxing the kit, I found the acrylic box was separated in its own space while the electrical components were in their own ziplock bag which is great and prevents scratching of the acrylic and losing electrical components. However, the instructions weren’t included, but I looked at the listing and found the instructions there as a PDF file. The PDF instructions were very high quality, and the English was pretty good for a kit like this and very understandable. There was also a list of materials which tell the item names and their quantities as well as a circuit schematic. The instructions even used proper engineering terms. As I was at a house without access to a soldering station, all that was available was a $3 harbor freight soldering iron and some very cheap solder. First, I explained the components and gave a brief overview of how each one works. I then taught my sister how to solder and soldered two pins of the SMD component to show her was it was like and explain. I then let her solder the rest of the pins, and amazingly, she was able to solder them correctly. She was also able to solder all the resistors, and the header pins, and the LEDs without more than 2 bridged connections which she corrected on her own without me telling her how to correct them. As this was her absolutely first time soldering and she did so well and picked it up without a problem, I was very amazed. As an electrical engineering student myself, I see a good number of college students (around half) having trouble soldering their boards of even easier difficulty and a lot of them even messing up their boards and needing to get a new one. After doing about half of the kit, my sister wanted to take a break, so I let my 16-year-old brother complete the rest of the kit which he easily did as he has been soldering for a while. I also let my brother assemble the acrylic part. As acrylic smudges with fingerprints, he made sure to not touch the inside surfaces of the acrylic as he installed the panels to prevent the final product from looking dirty. Once the product was assembled, we applied power via USB port and the product turned on. Upon changing the channels and cycling all the way through, we couldn’t get the radio to pick up any radio stations. However, the radio was tested in Japan and the FM band in Japan is about 76-90 MHz while in America, the FM band is about 88-108 MHz. Furthermore, the frequencies in Japan are in different increments for tuning than in the US. This radio supports frequencies 87-108 MHz and most radio stations in Japan also aren't going to be close to 90 MHz either. This explains why the radio doesn't pick up Japanese radio stations. While the radio doesn't pick up Japanese radio stations at all, this is not a design flaw of the radio at all and it was demonstrated that the radio does work on US frequencies when I used a radio transmitter to test. . We tested the radio by using a portable radio transmitter and set both the transmitter and this radio kit to the same channel and it picked up the sound perfectly. The sound quality was really decent for a radio. That tells that the radio kit does work. Regarding the functions of the kit, there were minor things I found awkward. The volume increase button and decrease button were “switched” in a way. Volume up was on the left and volume down was on the right. The same was done for the channel increase and channel decrease buttons. This “switching” wasn’t intuitive and goes against what you would expect and can cause confusion. The other thing was the screen said stereo on it, but this radio isn’t stereo at all as it is only one speaker and therefore mono. This isn’t a bad thing, but the screen shouldn’t mention stereo. Overall, I am pretty satisfied with this kit. For one, it has taught my 12-year-old sister to solder and allowed her to find that she could solder to a very reasonable proficiency at such a young age and at her first try which I am sure she found amazing. Now, she discovered another skill she could use later which is very useful. My brother liked soldering it up too and assembling the product and I enjoyed using it as a teaching tool and we all enjoyed testing the final product. The whole assembly process in itself was a lot of fun. While we did it in one sitting, I would highly recommend doing half the assembly, taking a break, then doing the other half. The things I would recommend improving are having the volume buttons and frequency buttons arranged so left is lower volume and up is higher volume. I would recommend also having the volume settings persist even when power is removed. I would also recommend including a headphone jack to listen with headphones and get stereo sound as well as having an audio in jack to allow the radio to also be used as a portable boombox. Otherwise, the product is really cool and functioned as intended. The LEDs were an extra cool feature that is fun to watch as the radio plays too. Overall, I am giving this product a 4.5-star review because the volume and frequency buttons were “reversed” and there isn't any stereo output as it says as well as there not being AM channels or an audio in. Since Amazon doesn't allow 4.5-star ratings, I am rounding to the nearest whole number which is 5. Overall, I am very satisfied with this product and the teaching/learning opportunity it brought.

I found the assembly very easy and straightforward. It does require soldering skills which can be found from a video or two and by the time you are done you will get ample practice. You need to either print out the user manual from Amazon or scanning the QR code. Part orientation-like polarity on electrolytic capacitors and LED and general diodes were clearly described both in words and clearly marked on the well-printed circuit board silk-screening. One cautionary note that should be added is to minimize the bending of the stranded wires soldered into PC boards and speakers. The stranded wire is made solid when the strands get filled with solder and will break after only two or three bends right where the solder-filled stranded wire turns back into all stranded. Typically, stranded wire is very flexible, but after soldering will break as described. I found the kit stocked with all the right parts and directions easy to follow. I even got help from my wife to speed things along. I hope you enjoy the project as much as we did.

I've been trying to learn to solder and needed something to practice on. I saw this and thought it would be fun! It absolutely was fun to put together. Once I found the instructions, they were clear and easy to follow aside from a couple things, and the end result is a perfectly working FM radio that sounds alright. It only does FM radio so if you're looking for AM too, you're out of luck. Overall a good time and good practice, but there are some drawbacks as well. It said it would come with a QR code to direct you to instructions, but there was nothing of the sort. I came back to the Amazon page and found a link to old outdated instructions. Eventually I just had to Google to find the right instructions. One of the acrylic panels had a defect that needed to be filed away before another piece would fit with it. The instructions also said to use screws that wouldn't fit where they said they would, but luckily there were plenty of spare longer ones. A couple hiccups, but we got there in the end! Good project, would recommend, especially if the manufacturer corrected these small issues.

日本語の取扱説明書がありませんでした。英語だらけの説明書のQRコードで英語版の作り方でやってみましたが、失敗しました。どこが悪かったのかもわかりません。初めて買う人はもっと安いやつで試したほうがいいかもしれません。買わなきゃよかった。馬鹿らしい。

This device may or may not work. I have purchased two. The first worked. The second only partially so and I am proficient with soldering techniques. I began the return process for the second unit but found that UPS ground shipment between Canada and the US overly expensive compared to the original purchase price.

Works well great kit.

Components and PCB looked to be good quality, but why such a project would not come with instructions is a bit unusual. My son and I spend hours following every step to the letter once we did eventually find instructions, but it wont work. We get a buzzing sound in the speaker, and the frequency buttons will not work. AND, the PCB had 3 extra areas not listed in the instructions, and we didnt have all the capacitors to complete it as the PCB outlines…. Very disappointed 10 year old here, for his first solder kit project.

商品到着 それも中国から 開封 部品有り 取説なし これでどうやって初心者は作ったらいいんだ・・・・・ 商品説明の欄に何も書いてない これじゃ作れない 皆さん