Electronics > Beginners
Bluetooth speaker module (spk md blk-b)
Lee_horner93:
Hi folks! I've been working on a a small Bluetooth project, creating a set of Bluetooth headphones, using the Bluetooth speaker module spk md blk-b that I purchased a few weeks ago from somewhere in China. Unfortunately I can't find any proper wiring diagrams or schematics for this specific chip, I will attach a few pictures. The problem is I can't seem to power the chip up no mater what I try, and I have tried with two separate modules.
I have seen diagrams of similar modules that feature a multi function button (mfb) that requires a long press (3sec) from the power supply to power it up. If anybody has any information on the chip that I have or know off any other methods to try and power it up that would be great!
Buriedcode:
Depending on which diagram you provided is your module, you need to pull the "Vreg" or "MFB" line high - to Vbatt via a 10k resistor will do. MFB = multifunction button and is usually the "pairing/power on/off" button on bluetooth audio devices. It is also sometimes referred to as Vreg, even though it is an input. It is essentially what powers up/down the internal 1.8V regulator which powered the chip.
I assume you mean this module: https://www.elecfreaks.com/wiki/index.php?title=BLK-MD-SPK-B
Lee_horner93:
Thanks for the response! Apologies the top image is the board I have, with the charging pins across the bottom. I will try this later. You wouldnt happen to know if the 1.8v circuit earths on the same pins as the 3.3v circuit?
Sent from my SM-G935F using Tapatalk
Buriedcode:
Yes, all the grounds should be connected. The 1.8V comes frm the module (on-board voltage regulator) but the 3.3V is supplied externally. It is designed to run from a lithium polymer battery so 3.3-4.2V on Vbatt. So for your module, Vbat is 3.3V in, and "Vreg" should be connected to Vbat by a 10k resistor.
Lee_horner93:
Just tried tried pulling the Vreg pin high and it works perfectly! Thanks very much!
Sent from my SM-G935F using Tapatalk
Navigation
[0] Message Index
[#] Next page
Go to full version