Project
Materials

Cracker Box Amp

WHAT WILL YOU MAKE?

An amplifier for your musical instruments (like an electric Canjo!). This is a more difficult project for the more experienced makers in your Camp.

WHAT WILL YOU LEARN?

You will learn to read a circuit diagram to build your own circuit and solder it together.

STEPS

STEP 1

Start soldering
Follow along with the schematic to build the board. To help out, Cairn Idris created a much easier to read circuit layout diagram. If you need more detailed instructions, take a look at the original project here at Make:.

STEP 2

Solder the socket
Start by soldering in the socket to the board. Make sure the circular notch in the socket is facing towards the top of the board.

STEP 3

Solder the main board parts
Solder in the resistor followed by the capacitors and then the power lead.

STEP 4

Add the jack
Solder wires to the input jack and then the jack to the board. Give yourself about 6 inches of wire to work with to make it easier to put in the box later.

STEP 5

Add the pot
Solder wires to the potentiometer (pot) and then the pot to the board, leaving extra wire this time, too.

STEP 6

Solder the rheostat
Solder the rheostat to the speaker and add wires to go to the board. Again, leave some extra wire.

STEP 7

Add the chip
The leads on your chip as they are shipped are bent out slightly. We need to bend them in so that they're perpendicular to the body of the chip. Gently squeeze them evenly to bend them in. Then push the chip into the socket, lining up the circle in the top of the chip with the circle in the socket.

STEP 8

Put holes in your box
Use your soldering iron to poke holes in your cracker box for the input jack, pot, rheostat, and a group for the sound out of the speaker. Use a pair of scissors to expand the holes so they are large enough for the posts and jack.

STEP 9

Put it all together
Remove the hex nuts from the jack, pot, and rheostat. Put all the electronics in the box, and then push the shaft of the pot and rheostat out of the holes for them and the end of the jack out of its hole. Screw the hex nuts back on to secure them in place. Add a battery, plug in your axe, and get ready to rock!

WHAT'S NEXT?

A cracker box is nice, but why not kick it up a notch by building a better enclosure? Add piezo pickups to buckets and random objects to turn them into instruments. If you really want to rock, you can build your own effects pedal to get some heavy guitar sounds out of your amp.

Materials:

  • 1 capacitor 0.047¬µF
  • 1 capacitor 0.01¬µf
  • 1 capacitor 100¬µf
  • 1 capacitor 220¬µF
  • 1 resistor 10Œ©
  • 1 battery connector
  • 1 toggle switch SPST
  • Cracker box, or similar
  • Battery 9V
  • Hook-up wire 20- or 22-gauge solid core
  • 1 prototyping PC board
  • Speaker 8Œ© impedance
  • 1 mono phone jack 1/4'
  • 1 IC socket 8-pin DIP
  • 1 potentiometer 5KW audio or log taper
  • Rheostat 25-ohm 25W
  • Audio amplifier chip LM386N
  • Soldering iron
  • Solder
  • Wire cutters

See More Projects in these topics:

Arts & Crafts Electronics Fabrication Music

See More Projects from these themes:

The Canteen (Mess Hall and Recycling Station)
Maker Camp
Maker Camp is a do-it-yourself online resource to help leaders like you organize a summer camp that engages children in making. Our goal is to provide you and your campers with the inspiration and the helpful resources, along with many possible projects to fit a wide range of interests and abilities. The idea is to focus on making as a playful, social activity. Maker Camp provides enough support for anyone to get started. Making provides experiences that help children become self-directed learners and good problem-solvers.
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Please Note

Your safety is your own responsibility, including proper use of equipment and safety gear, and determining whether you have adequate skill and experience. Power tools, electricity, and other resources used for these projects are dangerous, unless used properly and with adequate precautions, including safety gear and adult supervision. Some illustrative photos do not depict safety precautions or equipment, in order to show the project steps more clearly. Use of the instructions and suggestions found in Maker Camp is at your own risk. Make Community, LLC, disclaims all responsibility for any resulting damage, injury, or expense.

Maker Camp Project Standards

Based on NGSS (Next Generation Science Standards)

National Core Arts Standards

The National Core Arts Standards are a process that guides educators in providing a unified quality arts education for students in Pre-K through high school. These standards provide goals for Dance, Media Arts, Music, Theatre, and Visual Arts with cross-cutting anchors in Creating, Performing, Responding, and Connecting through art. The Anchor Standards include:
  1. Generate and conceptualize artistic ideas and work.
  2. Organize and develop artistic ideas and work.
  3. Refine and complete artistic work.
  4. Select, analyze, and interpret artistic work for presentation.
  5. Develop and refine artistic techniques and work for presentation.
  6. Convey meaning through the presentation of artistic work.
  7. Perceive and analyze artistic work.
  8. Interpret intent and meaning in artistic work.
  9. Apply criteria to evaluate artistic work.
  10. Synthesize and relate knowledge and personal experiences to make art.
  11. Relate artistic ideas and works with societal, cultural, and historical context to deepen understanding.
Please visit the website for specific details on how each anchor applies to each discipline.

NGSS (Next Generation Science Standards)

The Next Generation Science Standards (NGSS) are K–12 science content standards. Learn more.

Forces and Motion

  • 3-PS2-3. Ask questions to determine cause and effect relationships of electric or magnetic interactions between two objects not in contact with each other.
  • HS-PS4-5. Communicate technical information about how some technological devices use the principles of wave behavior and wave interactions with matter to transmit and capture information and energy.

CCSS (Common Core State Standards)

The Common Core is a set of high-quality academic standards in mathematics and English language arts/literacy (ELA).

Geometry

  • Grades K-2
    • CCSS.MATH.CONTENT.K.G.A.1 Describe objects in the environment using names of shapes, and describe the relative positions of these objects using terms such as above, below, beside, in front of, behind, and next to.
    • CCSS.MATH.CONTENT.K.G.A.2 Correctly name shapes regardless of their orientations or overall size.
    • CCSS.MATH.CONTENT.K.G.A.3 Identify shapes as two-dimensional (lying in a plane, "flat") or three-dimensional ("solid").
    • CCSS.MATH.CONTENT.K.G.B.5 Model shapes in the world by building shapes from components (e.g., sticks and clay balls) and drawing shapes.
    • CCSS.MATH.CONTENT.K.G.B.6 Compose simple shapes to form larger shapes.
    • CCSS.MATH.CONTENT.1.G.A.1 Distinguish between defining attributes (e.g., triangles are closed and three-sided) versus non-defining attributes (e.g., color, orientation, overall size); build and draw shapes to possess defining attributes.
    • CCSS.MATH.CONTENT.1.G.A.2 Compose two-dimensional shapes (rectangles, squares, trapezoids, triangles, half-circles, and quarter-circles) or three-dimensional shapes (cubes, right rectangular prisms, right circular cones, and right circular cylinders) to create a composite shape, and compose new shapes from the composite shape.
  • Grades 3-5
    • CCSS.MATH.CONTENT.4.G.A.3 Recognize a line of symmetry for a two-dimensional figure as a line across the figure such that the figure can be folded along the line into matching parts. Identify line-symmetric figures and draw lines of symmetry.
  • Middle School
    • CCSS.MATH.CONTENT.6.G.A.4 Represent three-dimensional figures using nets made up of rectangles and triangles, and use the nets to find the surface area of these figures. Apply these techniques in the context of solving real-world and mathematical problems.
    • CCSS.MATH.CONTENT.7.G.A.1 Solve problems involving scale drawings of geometric figures, including computing actual lengths and areas from a scale drawing and reproducing a scale drawing at a different scale.
    • CCSS.MATH.CONTENT.7.G.A.2 Draw (freehand, with ruler and protractor, and with technology) geometric shapes with given conditions. Focus on constructing triangles from three measures of angles or sides, noticing when the conditions determine a unique triangle, more than one triangle, or no triangle.
    • CCSS.MATH.CONTENT.7.G.A.3 Describe the two-dimensional figures that result from slicing three-dimensional figures, as in plane sections of right rectangular prisms and right rectangular pyramids.
    • CCSS.MATH.CONTENT.8.G.A.1 Verify experimentally the properties of rotations, reflections, and translations.
    • CCSS.MATH.CONTENT.8.G.A.3 Describe the effect of dilations, translations, rotations, and reflections on two-dimensional figures using coordinates.
    • CCSS.MATH.CONTENT.8.G.A.4 Understand that a two-dimensional figure is similar to another if the second can be obtained from the first by a sequence of rotations, reflections, translations, and dilations; given two similar two-dimensional figures, describe a sequence that exhibits the similarity between them.

National Core Arts Standards

The National Core Arts Standards are a process that guides educators in providing a unified quality arts education for students in Pre-K through high school. Also see Standards with cross-cutting anchors in Creating, Performing, Responding, and Connecting through art for Music.

NGSS MS.Engineering Design

The Next Generation Science Standards (NGSS) are K–12 science content standards.
  • MS-ETS1-1. Define the criteria and constraints of a design problem with sufficient precision to ensure a successful solution, taking into account relevant scientific principles and potential impacts on people and the natural environment that may limit possible solutions.
  • MS-ETS1-2. Evaluate competing design solutions using a systematic process to determine how well they meet the criteria and constraints of the problem.
  • MS-ETS1-3. Analyze data from tests to determine similarities and differences among several design solutions to identify the best characteristics of each that can be combined into a new solution to better meet the criteria for success.
  • MS-ETS1-4. Develop a model to generate data for iterative testing and modification of a proposed object, tool, or process such that an optimal design can be achieved.
For additional information on using content standards with our projects please visit the Maker Camp Playbook.

NGSS HS.Engineering Design

The Next Generation Science Standards (NGSS) are K–12 science content standards.
  • HS-ETS1-1. Analyze a major global challenge to specify qualitative and quantitative criteria and constraints for solutions that account for societal needs and wants.
  • HS-ETS1-2. Design a solution to a complex real-world problem by breaking it down into smaller, more manageable problems that can be solved through engineering.
  • HS-ETS1-3. Evaluate a solution to a complex real-world problem based on prioritized criteria and trade-offs that account for a range of constraints, including cost, safety, reliability, and aesthetics as well as possible social, cultural, and environmental impacts.
  • HS-ETS1-4. Use a computer simulation to model the impact of proposed solutions to a complex real-world problem with numerous criteria and constraints on interactions within and between systems relevant to the problem.
For additional information on using content standards with our projects please visit the Maker Camp Playbook.

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