Peel the covering of an AUX cable and separate the ground and signal wires. Attach the positive wire of the speaker to the collector pin of the second transistor. Now take a 1 uF capacitor and connect its positive leg with the base pin of the first transistor. Join the negative wire of the speaker with the collector pin of the first transistor as shown above. Connect a 10K-ohm resistor between the base and collector pin of the first transistor. Take two bc547 transistors and connect the emitter pin of the first transistor with the base pin of the second transistor. This circuit is not much powerful to use at parties but you can use this at your home. An external power supply is also needed to boost up the output audio. We can take the low input signals from the audio jack of smartphones or PCs and convert them into high-quality amplified output signals which are given to an external speaker. A transistor amplifier is used to amplify the low input audio signals. In this project, we will make an audio amplifier. Working transistor amplifierĪmplifiers are of many types such as power amplifier, video amplifier, IF amplifier, current, and voltage amplifier. You can also check our latest projects on IoT and basic electronics. The circuit which we are going to discuss is easy to make and required some basic electronics components. Have you ever seen the circuits of the amplifiers or the home theater that is used for playing the music? Do you want to make the same circuit for playing music? In this article, we are going to make a transistor amplifier using two bc547 transistors to make BJT as an amplifier.
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