25
Sep
22

ON THE BENCH, QUICK AND EASY BLUETOOTH ADAPTER CABLE

A BLUEMAT GROUP MEMBER SERIES

SOONER OR LATER IT’S APPARENT WITH ALL THE SMART DEVICES AROUND AND STREAMING SERVICES AVAILABLE IT’S A HASSLE TO EITHER GET THE CORRECT HOOKUP CABLE, AS EVEN THE STANDARD 3.5 MM OUTPUT JACK IS DISAPPEARING, TO CONNECT WITH A DEVICE, USUALLY RETRO AUDIO DEVICE THAT HAS THE TYPICAL LINE INPUT (RCA TYPE LEFT AND RIGHT OR 5MM 3 CONDUCTOR JACK).

IF YOU HAVE A BLUETOOTH SPEAKER , NO PROBLEM PAIRING UP. ON THE BENCH I USE THE SMARTPHONE DEVICE WITH THE PROPER APP AS A FREQUENCY GENERATOR FOR TEST PURPOSES OR JUST WANT TO HAVE MY PLAYLIST AVAILABLE TO PLAY THROUGH AN ITEM I’VE REPAIRED THAT DOESN’T HAVE BLUETOOTH INPUT PAIRING AVAILABLE.

ALL THAT’S NEEDED IS A SIMPLE INEXPENSIVE BLUE TOOTH MODULE WITH SOME AUDIO CABLES FROM THE SCRAP BIN AND A 120 VAC TO 5 VOLT DC SUPPLY WHICH OVER THE YEARS ARE ACCUMULATED ON THE SHELVE.

THE MODULE:

MH-ET LIVE MH-MX8 MP3 Decoder Board Bluetooth 4,2 Audio Modul Verlustfreie Stereo DIY Refit Lautsprecher Hohe Fidelity HIFI

M18

US $1.29×4

from Ali Express (no longer available from this store) there are others available

The schematic , actually you just need a power supply and a method to get the output to your audio device. I skipped the rest. Also this could be portable with the proper VCC battery setup. The amplifier is shown but not included.

power up test

The 5 volt DC adapter from the parts bin

Shrink tube, one of the greatest inventions in electronics. Positive 5 VDC to VCC, both VCC ground and audio grounds to ground. Left and Right audio out cable center conductors to appropriate solder pads.

Connect to line in to audio device, Here a power amplifier , it pairs and works

The shrink wrap cover, The blue LED visible

The completed Dongle

This adapter reads MH-M18. I don’t know the exact specification of the audio output as to frequency response etc. As always it would depend on the originating device and codecs used. It works for the intended use I need and simple to construct.



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