Simple Pocket Audio Amplifier

If you are an avid music listener and want to have a pocket amplifier of your own, then you can build your own pocket audio amplifier by using simple circuits.

All you have to do is list down the components that are needed for the circuit and get them from a nearby electronic shop.

It’s easy to build and costs less compared to readily available speakers.


  • 8ohm speakers
  • 4.7k ohm resistor
  • 1M ohm resistor
  • 10microFarad capacitor
  • BC327
  • BC548
  • 2AA battery
  • Battery holder
  • Connecting wires
  • Multimeter
  • Soldering gun and flux
  • Breadboard


How to Make:

Check the resistor values with the colored rings on them.

Capacitors are polarized. The longer lead is positive and small lead is negative.

BC548 is an NPN bipolar junction transistor. Keep the transistor flat ends facing towards you, the connection from left to right is collector, base and emitter. The connection is similar in BC327, which is a PNP transistor.

The speaker is of 8ohm impedance with 1Watt. You can choose a larger watt depending on the sound output you require.

Assemble all the components as in the circuit diagram. Once the connection is made, test the circuit for continuity. You can check it with a multimeter. After confirming the continuity, solder the components. Now by applying voltage your pocket audio amplifier is ready.


About Pavan Shetty

Masters in Embedded systems, Intern Embedded Engineer.

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