I want to build a stereo bluetooth speaker. Something that doesn't shout loudly when it turns on or connects. Which has good sound quality, range, and preferably cheap.
The BT receiver and decoder Stands on a thumb..or a stamp. Needs 5V supply or less (the 3.7 V potential provided by a lithyum Cell)
Just attach It to anything that has line-in and two channels.
If the sounds at start up are annoying Just provide a switch to mute
Just attach It to anything that has line-in and two channels.
If the sounds at start up are annoying Just provide a switch to mute
If noise at start up Is problem and a volume potentiometer Is not in the circuit, a switch might be substitited by a relay, so It can be 'programmed' to open contacts (or close them: if you put It at line level and use It to put to ground the signal) for the necessary time
Probably cheaper will be to buy Bluetooth speaker at Aliexpress.
Unless you want to gain experience in designing, soldering, drilling, sawing, planing, painting.
IMHO, the electronics will be the easiest and not the most expensive part of this project.
The cabinet and other mechanics will be more difficult.
I'd simply take something like this
It has more features than you'd want, but I find 'em all useful.
The cigar-lighter pod can be milled, anyway...
...you have the access to the 12-16 V terminals and if, as I think, the thing is mobile, it should be running with batteries.
Edit- whoops! it has no line out jack! It just connects via FM radio, as it's made for cars without 'wired' input
It has more features than you'd want, but I find 'em all useful.
The cigar-lighter pod can be milled, anyway...
...you have the access to the 12-16 V terminals and if, as I think, the thing is mobile, it should be running with batteries.
Edit- whoops! it has no line out jack! It just connects via FM radio, as it's made for cars without 'wired' input
You are really interesting of SNR and THD in device with lossy data compression (as any Bluetooth) ? 🙂
