This Bluetooth Audio Adapter is meant to connect a Bluetooth audio source (like a smartphone or tablet) to a speaker system with a plain old line-in connection. It has the ability to automatically connection when the Bluetooth device comes into range. Sounds convenient until [Andreas Pösch] points out that he still has to switch the speakers on and off manually. This hack automates the entire thing using a bit of additional hardware.
If you look closely you’ll see that the black cables have barrel jacks. This is a power pass-through rig that he whipped up. The protoboard includes a 7805 linear regulator which feeds power to the green circuit board in lieu of it’s original power adapter. A MOSFET switches outbound power headed for the speakers. All of it fits inside of the original enclosure, and he only had to add one port for the AC adapter.
This would be absolutely perfect for an antique radio retrofit. One of these adapters can be had for just over thirty bucks!
30 Bucks? Mine in a USB Stick shape was 5 Bucks and works like a charm both with Apple and Android Devices.
@kommune78 Where did you get your adapter?
Good ol ebay. http://www.ebay.com/itm/USB-Bluetooth-Music-Receiver-Adapter-3-5mm-Stereo-Audio-Cable-iPhone-Mp3-Speaker-/200829891428?pt=US_USB_Bluetooth_Adapters_Dongles&hash=item2ec264f364
I have connected it to my vintage WEGA Amplifier, and as said, it really has a rock solid and clear connection.
Out of curiosity, which name does the device show when you pair the Bluetooth-connection ? I wonder if it uses the OVC3860-chipset, which has a pretty good sound.
It pairs as “DMZ-Music”, which by googling reveals that the “offcial” Modelnumber is “DMZmusic MZ-301” – I couldn’t find anything out about the Chipset however.
Or just build an audio activated switch. when audio is present close relay, ~30 seconds after audio goes away open relay. pretty darn easy with analog only components, even easier with a picaxe. And then it would work with any device.
Thats a bit more complicated that a single transistor as the guy has used. The BT device has an LED ‘connected’ light so linking that makes more sense (binary on/off when you want the amp on/off). I think that if you had to take the time to physically plug in your device to the aux, the power button ~1m away from it isn’t worth the effort of automating.. i would imagine that most wireless audio devices have a status led of sorts (certainly ‘connected’ is require to know your device is connected anyway!)
Won’t stop the speakers from buzzing.
“This is a power pass-through rig that he whipped up.”
Why are you putting so much emphasis on the “H”?
;)
is the regulator really necessary?
oh nevermind it powers the PCB not the fet … duh
That’s actually a valid question to ask as there is what appears to be a
regulator (U3) on the module itself. The input voltage would be limited
to the lowest of 10V rated bulk capacitor, regulator and/if any other
circuits uses make use of the input voltage directly.
how to amplify the sound (voice in headset) of Bluetooth headset
I got this dmzmusic wz301 usb bluetooth reciever and it works like crap with windows 8. It has connection problems and will distort sound after some time.
sorry mz301
Just wondering if your solution was for a single speaker or a pair. I have been looking for a solution which I could hook up to two identical active speakers which could be paired with BT as a single stereo Left right. Most of the solutions have a single L/R mini-jack so that I would have to run a wire across the room to the second speaker. This is obviously not good. The best sounding active speakers have seperate inputs. I am wondering if there is something out there to connect and still retain sync and stereo?
Hi Mic and others, I have ordered this receiver thinking I will use it in my car for streaming phone call audio to car speakers and use the phone microphone just like i do with aux cable. but have found out that when Bluetooth is on, the phone microphone will be switched off. Have tried to read settings in soundabout android app (https://play.google.com/store/apps/details?id=com.woodslink.android.wiredheadphoneroutingfix&hl=en) whether it contains any setting so i can enable phone microphone with the receiver. Can anybody help me with this? Will be highly appreciated. Thanks in advance.
I have the DMZmusic MZ-301and it pairs as dmzmusic, is it possible to change that pair name? Tks
On some chipsets you can connect a serial interface (UART RX/TX) and give AT#-like commands, i.e. AT#MMnewname would change the name to newname. Didn’t succeed with the mz301 though :(
Someone has mz301 linux driver ?
Mike, What bluetooth adapter did you use?? I’m lookig for some adapter with good frequecy response and good quality sound.