Audio Amplifier

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  PCB Design

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  Simulation

Overview

This is a basic audio amplifier that takes an input from a smartphone via an audio jack, amplifies its strength and outputs it to a connected speaker. There is also a current amplifier chip which ensures there is enough to power the speaker.

How I built it

After learning the theory behind the circuit I calculated the required cut-off frequencies to create a band-pass filter with a gain of approximately 7.7dB with the cut-off in the range of 23Hz to 30kHz .

What I learned

• How bias voltages can be used to predetermine operating conditions for electronic components within a circuit
• That decoupling capacitors are required to reduce noise within a circuit
• How to create a clean and tidy PCB design

Built With

• opa551-current-amplifier
• tl071-operational-amplifier