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Sherwood BT-R7 Bluetooth Receiver replacement.

Aftermarket bluetooth device to work in place of disconnected OEM version.

royrussellroyrussell
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Having acquired a Sherwood amplifier some time back i was curious about the Bluetooth interface on the front that requires a propriety Sherwood Bluetooth dongle to utilise.

Unfortunately this item in "Discontinued" and any old stock i had been able to find is ridiculously expensive, ( about the price i paid second hand for that amp).

After discovering the tech details of the interface i was able to acquire a few bits and knock one up myself and reasonably affordably.

Literature,

Sherwood Bluetooth schematic interface.

See attached schematic for connections.

Anyone want to volunteer to make up a 3d printed case for the home brew dongle???

  • 1
    Step 1

    Aquire Parts,

  • 2
    Step 2

    solder connector to breakout board,

    buzz out all adjacent pins and then do a continuity test on all pins.

  • 3
    Step 3

    Interface to the board removed from a generic BT audio receiver.

    NOTE that the numbering on the .5mm side of the breakout board is inverted, ie 1=24 ...24=1 as connector is actually mounted upside down.

    Bridge pins 1,2,3 (22,23,24 as labelled on breakout board.), on breakout board and connect to audio ground on receiver board.

    Bridge pins 4,5 (20,21 as labelled on breakout board.)and then connect to USB 5v on receiver board .
    Also bridge between pins 14 and 15 (11 to 10 on breakout board) to the 5v pins in previous step for "bt_det" pull up.

    Connect pins 6 and 7 (18,19 as labelled on breakout board.)to respective audio channels.

    Connect pin 12 (13 on breakout board) to USB 0v on receiver board.

    Connect analog audio pair as required.

View all 3 instructions

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Discussions

Ricky wrote 05/20/2019 at 00:20 • point

are you willing to sell one of these?

  Are you sure? yes | no

kknerr wrote 06/28/2018 at 13:57 • point

Would you happen to have another/current source for the connector?

  Are you sure? yes | no

allan wrote 05/20/2016 at 23:47 • point

hi royrussell. im in Melbourne au and would be very keen to get a dongle as well. would u be interested in makung 1 for me. allan@puppa.com.au 

cheers

  Are you sure? yes | no

royrussell wrote 03/06/2016 at 20:31 • point

Costs about $15AUD ($10USD) to build the first One as the connectors and breakout boards come in lots on 10 and 6. Subsequent dongles therefore cost about $3.50 as thats what the usb BT dongle component costs.

  Are you sure? yes | no

Spencer Haley wrote 03/06/2016 at 03:46 • point

Sweet project! What was total build cost? Typo@propriety/proprietary*

  Are you sure? yes | no

royrussell wrote 01/19/2016 at 05:09 • point

basically the project works a charm electrically, just need a nice housing to finish it off, i have built 2 , one for myself and another for a friend that has a sherwood amp. 

  Are you sure? yes | no

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