Things You'll Need
- LM358 operational amplifier
- Five-kiloohm resistor
- One-kiloohm resistor
- Two ring terminals
- 10 feet of electrical wire
- Electrical pliers
- Soldering iron
- Rosin-core electrical solder
- 12V DC power supply
- Wire cutters
Audio amplifiers can be installed on stereo systems to help get the full effect of the system. Amplifiers are used to amplify electronic audio transmissions by altering electrical signals without distorting them and converting them into enlarged signals. These larger signals are then reconverted into mechanical sound waves. Although audio amplifiers can be purchased for a price, it may be more economical to build your own using an operational amplifier. The operational amplifier has several pins used as the electrical terminals that allow wires to be easily connected to create an audio amplifier.
Lay out a piece of newspaper on a flat surface to set up a work area.
Use the wire cutters to cut five two-foot pieces of electrical wire.
Solder one of the ends of the first wire to Pin 3 on the operational amplifier. Solder a ring terminal on the unoccupied end of the same wire.
Join one of the leads from the five-kiloohm resistor to one of the leads from the one-kiloohm resistor. Solder this connection to Pin 2 on the operational amplifier to form a triple joint connection.
Solder the bare lead from the one-kiloohm resistor to one of the ends of the second wire.
Twist one end of the third wire with the free lead from the five-kiloohm resistor. Solder this connection to Pin 1 on the operational amplifier to form a triple connection.
Solder the remaining ring terminal on the unoccupied end of the third wire.
Join one end of the fourth wire to Pin 4 on the operational amplifier and solder the electrical joint.
Join the unoccupied ends of the second and fourth wire and twist them together. Attach this connection to the negative terminal on the 12V DC power supply and solder the triple electrical joint.
Connect one of the ends of the fifth wire to Pin 8 on the operational amplifier and solder the connection.
Join the free end of the fifth wire to the positive terminal on the 12V DC power supply and solder this connection.
Make a diagram of the multiple connections on a piece of paper to use a visual aid when building your amplifier.
Always use caution when handling soldering irons and electrical materials to prevent hazards.
Scarlett Gauthier began writing in 2003. Gauthier has a graphic design/arts DVS from Rosemount Technology Center in Montreal.