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Mobile Car Stereo Player

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    First published on: 1-10-2010


    Using a mobile phone while driving is dangerous. It is also against the law. However, you can use your mobile phone as a powerful music player with the help of a stereo power amplifier. This does away with the need of a sophisticated in-dash car music system.

    Most mobile phones have a music player that offers a number of features including preset/manual sound equalisers. They have standard 3.5mm stereo sockets that allow music to be played through standard stereo headphones/sound amplifiers. Nokia 2700 classic is an example.

    A car audio amplifier with 3.5mm socket can be designed and simply connected to the mobile phone output via a shielded cable with suitable connectors/jacks (readymade 3.5mm male-to-male connector cable is a good alternative).

    Fig. 1 shows the circuit of car stereo player. It is built around popular single-chip audio power amplifier TDA1554Q (IC1). The TDA1554Q is an integrated class-B power amplifier in a 17-lead single-in-line (SIL) plastic power package.

    Fig. 1: Circuit of mobile car stereo player

    IC TDA1554Q contains four 11W identical amplifiers with differential input stages (two inverting and two non-inverting) and can be used for single-ended or bridge applications. The gain of each amplifier is fixed at 20 dB. Here it is configured as two 22W stereo bridge amplifiers.

    The amplifier is powered from the 12V car battery through RCA socket J2. Diode D1 protects against wrong-polarity connection. LED1 indicates the power status.

    Connect stereo sound signal from the 3.5mm headset socket of the mobile phone to audio input socket J1. When you play the music from your mobile, IC1 amplifies the input. The output of IC1 is fed to speakers LS1 and LS2 fitted at a suitable place in your car. Electrolytic capacitor C5 connected between pin 4 of IC1 and GND improves the supply-voltage ripple rejection. Components R2 and C4 connected at mute/standby pin (pin 14) of IC1 eliminate the switch on/off plop.

    The circuit is quite compact. A good-quality heat-sink assembly is crucial for IC1. Fig. 2 shows the stereo socket and stereo jack.

    Fig. 2: (a) 3.5mm stereo socket and (b) 3.5mm stereo jack

    Assemble the circuit on a general-purpose PCB and enclose in a suitable cabinet. Small dimensions of the power amplifier make it suitable for being enclosed in a plastic (ABS) case with vent holes. Signal input socket, speaker output terminals, on/off switch, indicator, fuse holder and power supply socket are best located on the front panel of the enclosure as shown in Fig. 3. 

    Fig. 3: Proposed enclosure


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    commentPost Comment | 32 Comments

    ajeshmohan   1328 days ago

    i am a beginner thanks for the circuit pls advice where to connect volume control in given circuit
    commentReply   1 Reply
    Nivas   1211 days ago

    u should control in ur audio decuve.......
    vivekanandhan   1326 days ago

    its awesome
    P. Ramesh   1313 days ago

    Very Simple Circuit. Any one can assemble. Thank you for Publishing this.
    viveksk   1288 days ago

    good circuit it works well..and very simple to construct
    mejo   1285 days ago

    sir i am a eng student i need a working of this circuit for presentation. will u plz send it to my gmail.
    Ramees Raja   1271 days ago

    What is the cost of this IC ?
    savy   1261 days ago

    more info. plzzzzzzzzzzzzzzzzzzz
    vishal   1253 days ago

    that circuit is not working properly....pls modify and re publish
    commentReply   1 Reply
    Efy Admin   1252 days ago

    What problems are you facing? Please elaborate so that we may be able to find a solution.
    commentReply   3 Replies
    Hemanth Vaka   1145 days ago

    Sir i am not finding the specified ic. Can you help me with any of the alternate ics available?
    jaagut   938 days ago

    it will not work because the input capacitor polarity is reverse.
    jaa   938 days ago

    polarity of capacitor in input signal is reversed
    Ashutosh   1249 days ago

    Guys I am looking for the IC and did not find any suppliers or shops where I can purchase it in Mumbai. Can someone provide me the leads and what is the cost. I came to know that it is out of the market now and is outdated.
    Ashutosh Mishra   1249 days ago

    What should be the exact specifications of the speakers and does someone prepare a custom made PCB in Mumbai.
    amaran   1211 days ago

    give full deatilssssss...
    s.saravanan   1210 days ago

    sir i am a eng.. student. sir how to connect the stereo socket and stereo jack plz explain me
    arshad   1196 days ago

    sterio jack socket is mounted on pcb directly?
    faheem khan   1189 days ago

    remote music sterio
    Deepak   1188 days ago

    Sir kya ic ke saath heat sink lagana jaruri hai? agar nhi lagaye to ic damage to nhi hogi.
    commentReply   1 Reply
    nurul   1162 days ago

    do u want to use amplifier for big time. so heat sink is improtant
    Guneet Singh Chabbra   1172 days ago

    please can u send me the circuit diagram of a convertor circuit that will convert 250V AC to 12V DC with 5A current cause i am making this as my college project so i want a convertor circuit diagram so that i can connect it to the main supply directly
    AnujGuptaBVP   1144 days ago

    Sir what modifications do i need to do in this circuit diagram if my speakers are of 2ohm and 100Watt rating ......plz rply
    commentReply   1 Reply
    Efy Admin   1141 days ago

    This TDA1554Q is rated for 4-ohms, 2x22W. If you hook it to a 2-ohms speaker, your audio system may get damage within short time. One way to use 2-ohm speaker is to replace the TDA1554Q with TDA8560Q IC. You have to check the datasheet of TDA8560Q for proper connection.
    NAVEEN M   1054 days ago

    a 4ohm speaker is not available....can we use a 8 ohm speaker instead........can this be rigged up on a breadboard...plz reply soon
    Ali Akber   994 days ago

    Sir how would be the sound quality produced from it? and what can i do to make it a 4 channel output amplifier?
    lucky   958 days ago

    Good. Plz write about the output quality of sound produce and can we use woofer to the same or can we use tweeter to the same.
    Ashith Naik   916 days ago

    My car speakers are 30w to 160w...Can I do any modifications so that I can increase the watt in the circuit...
    Ashith Naik   915 days ago

    My car speakers are 30w to 160w...Can I do any modifications so that I can increase the watt in the circuit...
    Prashant Rakhunde   781 days ago

    Dear SirI have built the circuit facing problem i n in its output. Not getting sound from the speaker of Jetron make 4Ohm 80W specification of 6.Could you manage to rectify the problem its quite urgent.
    saravanan   752 days ago

    sirhow im control the volume ...can you give the volume control circuit
    Kiran Kumar   588 days ago

    Firstly great work. This circuit is not working. When i apply 12V from DC battery the circuit is drawing more power and when i check the voltage across battery in circuit it shows only 3V. So where is the fault ?

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