Lord of the Tools 4Pcs MP3 Bluetooth 5.0 Receiver Board Car Speaker Audio Amplifier 3.7V-5V Bluetooth Audio Receiver Decoding Board 3x3cm/ 1.18x1.18inch

This is Bluetooth receiver module; it supports Bluetooth 5 and has onboard decoding of mp3, AAC and FLAC, etc (it uses a Jieli AC65 series chip or a clone of it). Note, though, that it provides line-level output only; the "car speaker, audio amplifier" statement is not really true. You can probably drive some small speakers off of this, but realistically, you should take the line-level signal and feed it into an amp. As such, it is perfect for adding a new BT input to an ageing radio or other audio device or simply connecting to an Aux-In port on a car radio to get BT support in your car. These cards are very common, but most have a single frustrating issue that makes them all but useless if you wish to have a good long-term experience. The terrible power-on/connected and pairing "signals"; after trying various suppliers from various platforms and getting a range of different low-quality Chinese-english voice announcements, this one is actually a usable product that is not going to annoy the owner after a day or two. Rather than the "Blow toof dewice ees connecteder" screamed at you at full volume, you get a subtle "bloop-bloop" signal that has seemingly been lifted directly from the windows USB device connected prompts. I use these within a repair café where we are breathing new life into old equipment to save them from land-fill and/or extend the life of an old piece of equipment that may have sentimental value to the owner.The modules work nicely, but again, there's a lot of misinformation about these little boards. You can power directly from the +/- pads or via the USB (these are micro, not C, but you can't win them all). When the USB is connected, you get a stable 5V supply at the +/- pads that will top up the battery. The Jieli chip has a charging capability, so it should provide the correct protection on the charger; it is only really a top-up charge rated at about 100mA. I've not yet tested extensively as I tend to wire them directly from another supply, which has its own charging circuitry, and not use the USB at all.The output is through the 3.5mm jack or the three solder pads between the jack and the USB port (Right, Ground and Left). I've noticed that some people complain of hum. They are likely experiencing a ground loop, which is easy to do if you tap into an existing supply shared with the host device's circuitry. Use a cheap 5v-5v DC isolator, such as the B0505S-1W, and you should be good. Based on my tests, the board does not draw much power (around 12mA when pairing and 15mA during playback) so the 1W models are fine. I'll add a couple of photos showing the supply via a single 18650 cell, through the isolator, its just a dummy setup, though the isolator would be required if, for example, you took a 5V supply from the same battery pack as you were powering the amplifier/radio, such that they shared the common ground.Great little devices; thank you to the previous purchaser who quickly confirmed the "beep, not voice" status, and I hope this review pays that forward for some others.(The video shows the operation using USB and LineOut. The power supply is from a simple bench-top USB supply, and the output goes into the Aux-In of a pair of Ruark MR1-Mk2 speakers. You don't get a good measure of the quality as the recording is on my phone, and we're in my - far from ideal - office/workshop.)

Very happy with these - will buy more.

Thank you

adapté sur un amplificateur de sonorisation , ça fonctionne très bien.

la qualità del suono è molto buona per il prezzo, anche se alcune volte potrebbero esserci dei disturbi derivanti dal bluetooth (piccoli fischi)L’output audio è molto potente, equivale a quello di un pc e non c’è distorsione.Inoltre produce dei suoni che non danno fastidio quando lo si accende, si connette o disconnette al telefono. Per le chiamate non c’è il vivavoce perché non ha un microfono e nè alcun controllo per il volume/play/pausa sulla scheda.

L'ho messo in auto e funziona bene, si accende quando accendo l'auto e si collega subito al telefono.Uno dei quattro è arrivato con la porta micro USB saldata male.

Identifié sous la réf "JQ-BT" sur mon Bluetooth (ça doit dépendre des séries de fabrication). Fonctionne nickel avec la sortie casque intégrée ou sur un ampli externe en y soudant un câble blindé stéréo. Utilisé pour faire la liaison entre un smartphone moderne (sans prise casque jack) vers des enceintes amplifiées de bureau

Super produit, simple, efficace et compact ! Rien de plus simple pour la connexion d'appareil ! Toutefois, il faut un bon coup de fer à souder pour les petites soudure droite/gauche et masse ! Cela dit, Je recommande !