This small sized, portable and low cost USB MP3 player, can play audio files on USB. For implementing this portable device, you just need very few basic electronics components and hence you require less assembling time. Now we are going to design and build a compact size USB MP3 player module which can read and play the audio files stored in MP3 format on USB. This circuit uses a digital IC to convert the digital voice data into analog audio that can be heard through headphones or audio speakers
Circuit Components
R1, R5- R7- 1.5K R2- R4 – 22K R8 – 1M C1, C2 – 33uF C3- C8 – 100nF Crystal Oscillator – 12MHz PCM2704CDB IC Push Buttons Headphones – 32ohms USB interface (Female)
Circuit Diagram of USB MP3 Player
USB MP3 Player Circuit Design
USB MP3 Player Circuit Operation
Turn ON the power supply to the circuit by giving two respective DC voltages to the pins. Once the circuit is powered, it gets audio data and control data from USB through D- and D+ pins. Due to high speed transceivers, all this data transfer is carried out at full speed. This IC decodes the received data and converts to the analog audio which will be available at the VoutR and VoutL pins of the IC. It is also possible to increase/decrease the volume and also mute by pressing corresponding push buttons connected to HID pins. We can also connect audio speaker in place of headphones using appropriate power amplifier circuit between Vout pins and audio speaker. We can extend this circuit for remote control operation by adding an IR sensor with the corresponding receiver circuit.
Advantages of USB MP3 Player
Portable device as it consist less number of components Much easier construction Facilitates headphones as well as audio speaker output Most feasible and low cost alternative to commercial MP3 players
Note:
• +5V DC and +3.3V DC power supplies have to be derived from respective low dropout (LDO) regulators. • Loudspeakers or Low impedance headphones must need an amplifier circuit at Vout terminals to make audio signals audible. • It is recommended to go through the data sheet of PCM 2704CDB IC before going to build this circuit. You can download this datasheet by clicking here. Comment * Name * Email * Website
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