I've had a lot of fun making custom Bluetooth equipment for people. I've given a few old boomboxes new life and done some fun projects like turning old walkmans and packs of cigarettes into speakers.

Sometimes I can repurpose boards from discarded electronics, but the ones I've bought online always have some crappy English voice that says unnecessary phrases like "your device is connected" and "no devices connected" and "power off".

Frankly people have complained to me about the shitty digitized Chinese person speaking English every time they power on, and it bothers me too. And the thing is it's going to be playing at whatever volume setting the device was last at, which is often quite loud.

So does anybody have any experience here? I've had cheap ones from China that work great technically, but I can't deal with this voice anymore LOL

Are you aware of one with just harmony tones or chimes or something?

I recently aquired an old hacousto Accent 8x8 Audio matrix, however I cant find any still alive links for the companion software. The only lead ive found so far is an archived version of the website. Archive.org hasnt archived the actual file though. Does anyone know of any mirrors, repositories, archives, or other sources where something like this might still be available?

I have this old pair of Technics SB-3130, they are three way speakers. Both of the super tweeters are dead (infinite resistance) and I'm not sure if this impact the range of frequency feeded to the tweeter. Given the schematic diagram, if I remove the super tweeter, should I modify something to have all the high frequencied to the tweeter?

I have an old Bose SoundLink Mini II Bluetooth speaker that sounds quite decent to me. I want to upgrade/replace its internals with a Raspberry Pi Zero W and an audio DAC Shim attached to it, running piCorePlayer.

Since the Audio DAC Shim doesn't provide enough power, and the Bose seems to have a separate amp board, I want to use the amp board of the Bose to drive the speakers and eliminate the rest of the Bose PCBs. The amp board controller appears to be a TPA3118. With the help of the datasheet, I found out the audio input pins of the board:

LINN (Left IN negative)
LINP (Left IN positive)
RINN (right IN negative)
RINP (right IN positive)

The RPI Audio DAC Shim only has a 3.5mm headphone out, so Left, Right, and GND.

I already tried to connect it as follows:

L to LINP
R to RINP
GND to RINN and LINN

While this seems to work in general, the audio quality appears to be worse in comparison. When I plug the RPI DAC Shim board into the original Bose 3.5mm input (using a 3.5mm cable), it sounds better.

Here is my question: Is it fine to connect the 3.5mm signals as I did? It felt wrong to just connect RINN and LINN to GND, as RINN and LINN don't seem to be connected to GND otherwise. How do I properly connect the 3.5mm output to the Bose amp board?

Cheers

I am trying to use a lav mic with my headphones cause the inline mic for them broke. The headphones only have a TRRS output and the mic has a TRRS with a TRS converter/adapter. Can I find a 2 female TRRS and TRS to 1 male TRRS 3.5mm adapter? Would a 2 TRS female to 1 TRRS male adapter work in this scenario even tho my headphones are TRRS only? I know the mic sleeve is the end ring so maybe I dont need to fully plug in the headphones cause I'm trying to use another mic anyway.

These are the three things I have found -

Lav mic - https://www.amazon.in/Maono-AU-400-Lavalier-Microphone-Black/dp/B07JF9B592

Splitter(jack type unknown. possible 2 female TRS to 1 male TRRS) - https://www.amazon.in/Kinsound-Male-Female-Smartphone-Laptop（Grey）/dp/B089NVPFYY

Splitter(apparently 2 female TRRS to 1 male TRRS. practically perfect for my purpose) - https://www.amazon.in/CABLESETC-Universal-Microphone-Duplicator-Splitter/dp/B01MXPFQ85

I am not an avid electrical engineering guy. Just trying to fix some stuff with the limited knowledge I have.

Some pictures and a schematic that I traced out during the repair of an Audio Technica AT803b preamp