A Bluetooth speaker

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Thermionic Idler
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A Bluetooth speaker

Post by Thermionic Idler » Fri Dec 28, 2018 6:33 pm

We spent Christmas in a remote holiday cottage and very fine it was too. Although there was a TV, we spent each evening listening to music, as there was a Bush Bluetooth speaker and an internet connection. A smartphone with Qobuz provided the missing link.

I’ve often explored possibilities for music when on holiday, which have often involved how to play vinyl, horribly impractical when travelling. However, on this trip my thoughts have returned to the concept.

I am basically after a one box plug and play solution - unpack, plonk down, connect an IEC cable, pair a phone, music.

So how about this - the box incorporates micro-Fonken enclosures each side (which we heard a couple of Owstons ago). Each enclosure houses the OPT as well as the Fostex driver. In the middle, a very simple EL84 single ended amplifier. Tube-rectified, that way the 5v rectifier heater winding could also power the Bluetooth board, which seems to be a standard.

Any thoughts/ideas much appreciated, particularly around the Bluetooth board which I have little experience of.
Deck: Garrard 301
Audio Origami PU7
Van Den Hul Black Beauty
Phono: Whest PS30RDT
Pre-amp - Scratch built AMB α24/LCDuino
Amp - Transcendent "Son of Beast" 15W OTL
Speakers - FF225WK Metronomes

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The Stratmangler
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Re: A Bluetooth speaker

Post by The Stratmangler » Fri Dec 28, 2018 8:57 pm

Incorporate a Raspberry Pi loaded with piCorePlayer (which can operate as both server and client simultaneously) with the relevant LMS plugins installed.
piCorePlayer will announce itself over the network, and a smartphone app can control it all over WiFi.
You could have it fronting up a valve amped setup, or you could add an amplifier HAT on the RasPi (DtB has already done the latter a year or three back, and run the lot in his glass lean to, aka the conservatory).

The later RasPi boards also have Bluetooth, but it's a whole different bunch of software that you need to play with.
Chris :happy3:

gninnam
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Re: A Bluetooth speaker

Post by gninnam » Fri Dec 28, 2018 9:37 pm

The Stratmangler wrote:
Fri Dec 28, 2018 8:57 pm
Incorporate a Raspberry Pi loaded with piCorePlayer (which can operate as both server and client simultaneously) with the relevant LMS plugins installed.
piCorePlayer will announce itself over the network, and a smartphone app can control it all over WiFi.
You could have it fronting up a valve amped setup, or you could add an amplifier HAT on the RasPi (DtB has already done the latter a year or three back, and run the lot in his glass lean to, aka the conservatory).

The later RasPi boards also have Bluetooth, but it's a whole different bunch of software that you need to play with.
I believe the same software will still work but with extra drivers etc - all documented :D

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The Stratmangler
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Re: A Bluetooth speaker

Post by The Stratmangler » Fri Dec 28, 2018 9:44 pm

gninnam wrote:
Fri Dec 28, 2018 9:37 pm
I believe the same software will still work but with extra drivers etc - all documented :D
You're right - I remember reading about pushing files to a device in LMS, and it was a simple plugin that was required.
I seem to recollect that the push through was performed over Wi-Fi.
..
Chris :happy3:

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Ray P
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Re: A Bluetooth speaker

Post by Ray P » Wed Jan 02, 2019 6:59 pm

Going to the lengths of incorporating a RPi etc. seems like over-complication to me, given that you already potentially have a device capable of high quality playback in the shape of your smartphone; Assuming its an Android phone, get youself the USB Audio Pro player app from the Google store;

http://www.extreamsd.com/index.php/prod ... player-pro

and, by using a USB OTG cable, you'll be able to feed excellent quality digital to whatever device you decide to build and you'll transform the playback capability of your smartphone for use with headphones at the same time. A number of streaming services are supported as sources for USB Audio Pro, including quboz.

If you go the valve amplifier route you'll need a USB DAC of some sort but then you'll still need a DAC with the RPi route. If this is your preferred approach I recommend having a look at the JL Sounds products, which'll give you great sound quality via USB or I2S to feed into your amplifier. However, if you're prepare to compromise with added convenience/simplicity against a purist audio approach, you might want to look at some of the Class D amps available on ebay as they'll take a direct USB input - I found this one very quickly on ebay but you may find something better if you search more diligently.

https://www.ebay.co.uk/itm/TPA3116-100W ... :rk:3:pf:0

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Ray P
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Re: A Bluetooth speaker

Post by Ray P » Wed Jan 02, 2019 7:07 pm

Maybe an even simpler Class D amp module;

https://www.ebay.co.uk/itm/Digital-15V- ... :rk:5:pf:0

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Mike H
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Re: A Bluetooth speaker

Post by Mike H » Thu Jan 03, 2019 3:10 pm

FWIW I've been using little Chinese Bluetooth receivers I got off eBay for the past 3 years. They're so good I can't tell any difference between them and a straight cable connection. I use my laptop as the "transmitter", or could be the iPhone. First one I got was the bare board version:
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Blutooth Adaptor_2327.jpg
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Then later, two more encased (so got 3 of the things - 1 as a spare):
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Blutooth Adaptor_2325.jpg
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Note they need a 12V adapter, also cheap as chips off eBay. Easy-peasy lemon squeezy. Image

These aren't made anymore I don't think, but lots on eBay, couple of quick examples:

Bluetooth-4-2-Audio-Receivers

UGREEN-Wireless-Bluetooth-4-1-Receiver

HTH
 
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Thermionic Idler
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Re: A Bluetooth speaker

Post by Thermionic Idler » Thu Jan 10, 2019 1:00 am

Thanks very much for the input everyone - certainly something to chew on. My inclination is to go for the simpler Bluetooth boards I think. But many things need to be done before I get to this.
Deck: Garrard 301
Audio Origami PU7
Van Den Hul Black Beauty
Phono: Whest PS30RDT
Pre-amp - Scratch built AMB α24/LCDuino
Amp - Transcendent "Son of Beast" 15W OTL
Speakers - FF225WK Metronomes

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