A very simple 2 watt audio amplifier circuit has been presented here which can be constructed by all new electronic hobbyists for amplifying small signal frequencies and for other similar experiments.
Circuit Operation
- This mini cellphone music amplifier circuit utilizes just a single IC 741 and a few other passive electronic components, making the entire working very easy.
- Being small doesn’t limit its dynamic features which can be compared to a standard amplifier specs. Though the power output is not more 2 watts only, becomes sufficient loud for applications like a radio pick up amplifier or a traveler’s ipod amplifier unit.
- The pot VR1 is used for adjusting the volume of the amplifier while the pot P2 is used for rectifying high frequency interventions if they are above 20dB. The IC 741 here actually acts as low gain amplifier and is responsible for stepping up the amplification just to a level that might be enough for driving the output power transistors.
- The two diodes D1 and D2 have a specific role and help to fix an ideal quiescent current level for both the transistors. The output transistors are arranged in a push-pull manner, as the name suggests they operate in tandem, generating a powerful push and pull of the amplified audio into the connected speaker.
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