DIY Bluetooth-Compatible Speaker Kit, DIY FM Radio Soldering Project USB Mini Home Sound Amplifier DIY Electronics Kit with Digital Display and Co...

The media could not be loaded. This is an interesting little project. Its sold as a Bluetooth speaker, MP3 player, FM radio, auxiliary audio amplifier kit. But that part isnt the kit part at all. The real brains of the operation are very complex, so that part comes prefabricated. The part that you build is the audio bargraph display, as well as the acrylic box that houses it all. Its really two independent circuits in one, with you building half, and leaving the other to factory assembly line. The construction guide is excellent. Every step has photographs to keep you going. My 11-year-old daughter and I built it over the course of a few evenings. If you just sit down and get to work by yourself, it will probably only take a couple of hours. A little hint for assembling the acrylic box is to use a small magnet to hold the nuts but the edge in location while you turn the screw with the other hand. It is powered by USB and has no internal battery. If you need it to be portable, you can use a USB battery bank, but test yours with it a bit in advance. I have several, and some work great, but this speaker doesnt draw enough continual power to keep some of my other ones powered up. They think that they can shut down because nothing needs much power. Pairing with Bluetooth could not be easier. Put it in Bluetooth mode, and youll see it on your phone. Its a cinch. Its not going to rival a Bose, but its plenty loud and the sound quality is not lacking. Load some music onto a MicroSD card (the manual says TF card, but MiscroSD works just great) and it just starts playing. Same with a USB thumb drive. The FM radio took a little figuring out. Put it into FM mode, and hit the Play/Pause button. That will get it scanning through the whole FM band, remembering stations that were strong enough to hear. Let it finish. After that, you can use the Volume Up/Down buttons to switch between the stations that it found. Hold the volume buttons to change the volume. After that, use the remote to shut it off, not the power switch on the back, and it will keep the scanned stations in memory for quick use next time. Now heres the neat part: if you shut it off with the remote, the amplifier/Bluetooth/MP3 unit shuts down and the screen goes dark. But the bargraph circuit that you built is still powered, and heres the kicker: the bargraph is not connected to the player circuit to know what to display. It has a microphone that just listens to the speakers, processes it, and displays the lights on the bargraph. So, when you power the main unit off with the remote, the microphone and bargraph is still listening, so it flashes and lights when people talk, or when the phone rings, or whatever. Its a lot of fun. If you dont want that to work, just flip the power switch on the back, but were having a ball with this! You will too!

Very easy to build! The PCB is good quality. It's multi layer so be careful soldering as a mistake may result in a blocked via. Don't ask how I know. Works great! My kids love it.

Great kit well organized good directions to follow but when you get to soldering in the 12 LEDs pink blue green, you will need to use Google translate the three packages of four leds are in Chinese language but we can figure this out. Just use Google translate. All good.

Nice little radio kit for someone with ZERO electrical engineering knowledge. The instructions arent great the parts are slightly different and the power is not enough for the speakers. If i use just one speaker no issues, both hooked up volume cant go past 20 without shutting down the radio.