Retro Gramophone Style Bluetooth Speaker

Hello everyone.. It's. Infinity Workshop here again... Today I made a modern and mini Gramophone replica for this Retro Tech challenge... Which is actually a Bluetooth speaker... With dual 3w drivers.....

For this project, I used the parts which are very common in the DIY community... And made the whole project small enough to make it easy to store the final project in a less space-taking way...

So without wasting any more time... Let's get started...

As my any other project... I wanted to keep this project simple and easy to make... As I stated before I keep the parts lists simple and used only super available parts... I could have used more expensive or advanced electronics parts... But that's not what I wanted for a build guide...

So here is the list of things we are gonna need for this project... 👇

• 3d files( i used 3mf file format.... Not STL this time...But.. it's not possible to upload 3MF files here... so I'm uploading the STL files)
• 3d printer( I used my Ender 3)
• PLA filament... (colour doesn't matter as we are gonna paint the project anyway..)
• 18650 Lion battery... + battery holder
• Tp4056 battery protection and charging board
• Pam8403 dual channel 3 watt class D audio amp
• Bluetooth module (with inbuilt usb, micro sd, aux and Fm support)
• 2 speakers... Mine was 4 ohm 5 watt speakers (diameter of 5 cm)
• 6 pin dtdp switch
• Silicon glue
• Hot glue
• Clear coat lacquer
• Metallic paint
• Some random items...

Firstly I want to say that from this project and onwards... I will be making and giving the 3MF files... And will discontinue using the STL formats...

I have given all the 3d model files that I have made for this project... Download them all.. Then print them on your 3d printer according to your preference and settings...

I usually used 10% infill for my parts and an average wall thickness of 5 lines...

I printed every part in white PLA filament... Except for the horn part... As my white filament was almost finished and I didn't want to risk my print... So I used the black filament... This will not make any problem as they will be painted anyways...

The overall printing cost and time may vary upon your conditions and settings...

After printing all the parts... It's a nice habit to make a test fit... As the parts are 3d printed... There might be some tolerance issues... So check all those... And if there is any fitting issue... Use something sharp to trim those parts...

Now wire everything according to the given electrical diagram...

Firstly attach the charging module (tp4056) with the battery terminals...

Then attach the 5-volt output from the module to the pam8403 and the Bluetooth module in series of a dtdp switch...

Then take the output from the Bluetooth module and extend those lines to the input terminals of the pam8403 amplifier board...

Finally, take the 2 outputs from the amplifier board and extend those wires to the speaker drivers... Pls, be careful about the polarity of the speakers... And don't short the ground terminals of those...

If the wiring is perfect... Then there will be no problem... And it will power up on the first try...

Test the Bluetooth functionality and the others also...

One thing I want to mention here... There are some similar Bluetooth modules... They are all the same... Except some of them have a dedicated amplifier board Inbuilt... Don't use them... Otherwise, the wiring will not match with this project... Otherwise, they are OK...

Now it's time for the next steps...

Place the power button cover in its dedicated space and then put the switch in that...

Then attach that... With two pieces of cardboard... And hot glue...

It's an easy part... And this can be done very easily...

Now it's time to assemble the electronics in the box...

We need to pack everything in the box with hot glue and some precise positioning...

Attach the speakers in their places... With some silicon glue... And some dabs of hot glue...

The silicon is necessary to make the box airlock.. Because we don't Want to make any air gap.. Which will reduce the sound quality..

Now add the Bluetooth board in its intended place... Use the cutouts as a guide and attach that in place... With plenty of hot glue...

While doing this.. Also, attach the battery charging module... Tp4056... Just under the sd card slot...

This will be for recharging the battery...

Now as I added in my project... We will implement some LEDs as the power-on status indicator... And the charging and charge complete indicator...

I simply took a yellow led and soldered the wires with the power terminals of the Bluetooth board...

Similarly... For the charging board... I Firstly removed the old smd lights... Then extended some big LEDs to those pads...

Thus making an external led indicator... 😁

Now attach the top plate with the body part... With some silicon glue... It will ensure a good air-tight seal...

If you want.. You can use some other glue also...

Now... Add the four decorative pieces... At each side of the body...

These don't have any functional use.. But. For the aesthetic purpose...

After all... We are making a retro Gramophone... 😉

Now.. Attach the horn piece.. With the rest of the pieces... First of all... Attach the support piece... Then the tone arm....

Finally, attach the needle attachment with the tone arm.. As shown in the picture...

Use my reference pictures for the job...

Attach the Horn assembly on the top plate... With the record holder in place with proper placing..

Use plenty of glue where needed...

Now.. Attach the handle... Firstly... Attach the Knob with the handle piece..

Then slip the handle through its intended hole...

Then finally secure the piece with the provided washer (3d printed) from the inside...

Now.. Simply follow the previous process.. And attach the bottom piece... With The closing plate and the 4 legs...

And it's done...

Now cover any exposed electronic parts... And spray one or two coats of primer layer of paint.. I don't have any filler primer.. So I sprayed clear lacquer.... (I only have that one)....

Now.. It's time to do the paint job...

Paint the horn with metallic gold paints.

And the body with some combination of paints...

Make sure to do the paintwork well...

After some refinement... And final touches... The project is done....

Now you also have your own mini Gramophone replica....

For this project... I didn't want to make this project complex... I just wanted to keep the materials and the process simple enough... So everyone can make their own gramophone Bluetooth speaker...

There is plenty of space for improvements... This can be done with further planning and using more complex hardware...

Thank you so much for having a look at my project...