How to Build a Mini Audio Amplifier
Amplifiers allow small alternating current (AC) electrical signals to be amplified into larger-voltage signals that are identical in frequency. One common means by which to amplify a signal is by using an operational amplifier. An operational amplifier utilizes an integrated circuit package. This package allows for a simple yet reliable circuit to be constructed out of only the operational amplifier, a few resistors, as well as input and output connectors.
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Things You'll Need
- LM358 Operational Amplifier (Op-Amp) module
- Two 10 KΩ resistors
- One 1 KΩ resistor
- Two ring terminals
- Power supply
- 6V DC power supply
- Electrical pliers
- Electrical wire
- Soldering iron and solder
Instructions
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1
Cut a length of wire, and strip each end of 1/2 inch of insulation. Place a ring terminal over one end of the wire, and solder the terminal to the wire. Connect the other end of the wire jointly to one lead on one of the 10 KΩ resistors and pin 3 on the Op-Amp module. Solder this connection.
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2
Cut a second length of wire, and strip each end of 1/2 inch of insulation. Connect the free lead of the soldered 10 KΩ resistor jointly to one lead on the 1KΩ resistor and to one end of the second wire. Solder this connection. Connect the free end of the second wire to the negative terminal connection on the power supply.
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3
Connect the free lead of the 1 KΩ resistor jointly to one of the leads on the unused 10 KΩ resistor and pin 2 on the Op-Amp. Solder this connection. Cut a third length of wire, and strip each end of 1/2 inch of insulation. Place the second ring terminal over one end of the wire, and solder the terminal to the wire. Connect the free lead on the 10 KΩ resistor jointly to the other end of the wire and pin 1 on the Op-Amp. Solder this connection.
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4
Cut two more lengths of wire, and strip each end of each wire of 1/2 inch of insulation. Solder one end of the first wire to pin 4 on the Op-Amp. Connect the other end of this wire to the negative terminal on the power supply. Solder one end of the second wire to pin 8 on the Op-Amp. Connect the other end of this wire to the positive terminal on the power supply.
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