Introduction: An Electric Musical Instrument 3D Printed Amplifier.

Project Definition.

I hope to puddle a printable amplifier for use with an Electric Violin or any other Electric Instrument.

Specification.

Purpose as many parts as possible to be 3D printable, make it stereo system, use an active amplifier and keep it undersize.

Electronics.

Adafruit's Stereo 20W Class D Audio Amplifier is the idyllic amplifier for the line of work. I searched for suitable speakers and found some diminutive 4" 60W speakers. Bestow in a PSU and a 10k Potentiometer for volume check and I was set to rile work designing the speaker corner..........

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Step 1: The Parts.

Components & Hardware.

  • Matched 4 Inch Vehicle Loudspeaker.
  • 1/4 Stereo Stimulus Jack.
  • 12V 5A PSU.
  • Adafruit Stereo 20w Class D Audio Amplifier - MAX9744.
  • Adafruit Panel Mount 10K Potentiometer.
  • 4 x 6mm M2.5 Socket Caps Screws.
  • 32 x 12mm M4 Socket Cap Screws.
  • 3 x Cable Ties.
  • Optional Miniskirt 3.5mm to 6.35mm 1/4" Gold Stereo Jack Headphone Arranger.

The eBay linked components are affiliate links.

Printables.

The Design files, including the STLs, are available from Thingiverse.

  • https://www.thingiverse.com/matter:2466042

Choose a ripe filament to print the four STLs. I deliver chosen SpoolWorks Edge.

  • spoolWorks Edge Deep Purple.
  • spoolWorks Edge in Clear.

Delight aid support my work here happening Instructables and on Thingiverse

away victimization the succeeding affiliate links when making purchases. Thanks :)

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Step 2: Modelling in Fusion 360.

Fusion 360.

To Begin I am modelling the components in Fusion 360. That leave help during the purpose phase with fix all the parts in the amplifier. If you are new to Unification 360 In that respect are many tutorials explaining how to use it.

Step 3: The Speaker Box.

Basics.

The amplifier is to hold within itself: two speakers, a PSU, amplifier electronics, cables, an stimulation jack and a volume knob.

I started by copying the sketch used to model the speaker, making deuce copies and then separating them making sure to pull up stakes enough space betwixt them for the 10k Mass.

I added circles for screws, and added out circles to represent the have a go at it caps.

Superior Sound Quality.

I wanted to stimulate free bm of vent around the deuce speakers so I drew air channels with first vents. Hopefully this will ameliorate the sound quality. I'm not a sound mastermind then this is basically guesswork!

After the sketch has been careworn I can squeeze out the posture.

I make up a space for the speakers, add openings for the airwave ducts, add the back, extrude holes for the screws and indent the front by 1mm so the speakers will sit flush to the front.

Step 4: The Front.

The Facia.

The advanced fascia is extruded from the same sketch used to model the speaker box.

I added holes on the undersurface where the screw caps that hold in the speakers will be.

Step 5: The Back.

The Back.

I added a new sketch panel to the rear of the Loudspeaker system Package. Information technology would have been thinkable to use the unvarying sketch from earlier.

The Back is extruded 14mm and indented 5mm. Pillars are added for the amplifier board. Guides are added to sustenance the PSU in the slump put up and channels added for cables ties so it is held secure.

A small communication channel is added on the side where the mains power atomic number 82 will pass through.

Step 6: Bulk Command Knob.

Loudness.

Victimisation the original sketch, reduced-outs are extruded into both the facia and loudspeaker system box. There is a hole which opens out into the rear end of the speaker system package for the wires. The head-on fascia has an increased hole for a printed volume thickening.

The Volume Knob itself is extruded from a single sketch.

Footmark 7: Input Jack-tar.

Input.

You have the option of fitting either a 3.5mm jack, or a 1/4" Jack. I chose the larger 1/4 A this is the standardised for electric instruments.

Afterward measuring the input jack I give birth added a sketch at the rear of the speaker box. I used this sketch to squeeze out holes and clearances for the jackstones.

Step 8: Printing &adenylic acid; Assembly.

Printer Settings.

  • 0.4mm Nozzle.
  • 0.3mm Layer Height.
  • 3 x Perimeters.
  • 40mm/s Speed.
  • 12% Infill.
  • Sliced with Simplify3D.

Printing takes ~48 hours for all parts.

Assembly.

Assembly begins with installation of the 10k Pot into the Fascia. It is held in with a supplied nut and washer. Solder a wire to for each one of the terminals. Press the volume knob onto the 10k Pot from the front. It should turn freely.

Next solder speaker telegram to the 2 speakers, the terminals should be marked + & -. It is important for sound quality that you fetch the connections correct connected the speakers.

Feed the wire through the holes in the speaker box and secure each speaker using 4 x M4 12mm Socket Cap Screws.

Pass the volume curb wire through the hole and secure the Fascia using 14 x M4 12mm Socket Cap Screws.

Step 9: The Electronics.

Soldering.

Adafruit's 20w Stereo Amplifier requires some assembly. There is an excellent teacher along learn.adafruit.com which goes into detail and explains exactly how the amplifier needs to personify configure for use with the 10k Pot.

https://learn.adafruit.com/adafruit-20w-stereo-sound-amplifier-class-d-max9744

When soldering the input sea do it is very serious that you make a note of each connective. Incorrectly wiring the labourer to the amplifier can break IT!

Ill-use 10: Wiring & Power Up.

Final exam Assemblage.

Mount the amplfier to the back panel, secure the PSU in with two cable ties then connect the wires. I put a single cable tie onto the A/C lead to stop the cable from being pulled taboo.

Connect the cables to the amplifier board ensuring you induce the justly polarities!

Good the vertebral column onto the utterer box using 10 x M4 16mm Socket Cap Screws, winning care not to trap any of the wires.

Nag In.

The speaker box will work fine with any electric instrument. If you chose the optional 3.5mm - 1/4" adapter jack then you can even plug in your headphone too!

Plug in the input, turn on the mightiness and take heed!

Step 11: F-F-Fiddle.

Electric Fiddle.

The impetus tush the want to design an amplifier is the F-F-Play Electrical Fiddle by OpenFab PDX.

http://openfabpdx.com/fffiddle/

I followed their body-build guide and printed the parts exploitation the same materials to match with the speaker boxful.

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