Audio Amplifier. Design Note 22

TDA2002As a Hobbyist, you need simple amplifier circuits to make audio projects. Here explains the design of two Simple Amplifier circuits using IC BEL 1895 and TDA 2002.
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Amplifier for Mobile Phone


You can use this simple Amplifier to hear Music from Mobile Phone or MP3 player. It gives very clear sound through two 8 ohm speakers. It uses two identical circuits for Stereo operation. IC LM386 is the low power Amplifier IC ideal for battery operation. The output from Mobile phone is Pre amplified so that it can be provided to the input of the Amplifier using a Stereo jack. The filter circuit comprising resistors and capacitors at the front end filters the audio entering into the amplifier to give clear sound.

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Mobile phone Amplifier. Design Trick 7

You can use this Mini amplifier to hear music from Mobile phone or Laptop. The speaker of Mobile phone and Laptop is too small and the output voice is sharp with high tone which is not pleasant to hear music for long time. This circuit will solve the problem. It can be connected to the earphone socket of Mobile phone or Laptop. It is too small and portable. IC LM386 is used in the circuit which is  a low voltage audio amplifier IC and its gain is internally set to 20.
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