Tone Control for 150W Car Audio Amplifier

The tone control circuit build based on IC LF353 In stereo mode, we shall have the action of eight loudspeakers which are going to create a very important sound pressure.

Tone Control Scheme

Tone Control PCB Design

150W Car Power Amplifier

The power amplifier is built based single LA47536 power IC for each channel. For stereo channel you need two similar circuit for each modul (tone control and power amplifier)

The LA47536 is a 4-channel BTL power amplifier IC developed for use in car audio systems. The output stage features

• A pure complimentary structure that uses V-PNP transistors on the high side and NPN transistors on the low side to provide high power and superb audio quality.
• The LA47536 includes almost all the functions required for car audio use, including a standby switch, a muting function, and each protection circuit. It also provides a self-diagnosis function (output offset detection).

Power Amplifier Scheme

Power Amplifier PCB Design

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With the integrated audio TDA8571J designed for automotive applications, this 40w amplifier circuit can expand the sound of the car radio or connect a portable MP3 player in it. Internally, the chip has eight operational amplifier set on the bridge, allowing each speaker terminal being energized. Dont connect the negative terminal of the mass of the speaker, because they will produce a short circuit on the output.

As usual in these kinds of development, the heat dissipation is an important factor forproper cooling to ensure stable operation, but poor ventilation can destructive circuit.Although it has an internal thermal overheating protection, is still destructive.

If you want to use it at home (not recommended), you should use a 12V source capable of draining up to 250w at 12v. Remember that filtering is a key source of success in anyaudio installation. Use a large electrolytic capacitor to eliminate riple and, in turn, foreliminate the RF ceramic capacitors.

For input using shielded cable and RCA female plugs. To connect to the car radio is recommended that you put between it and the amplifier a passive equalizer, In addition to controlling the tone voice, also can reduce in signal strength.

In the audio car application should be very careful where you get power because the system requires a large amount of power. Placing it on top of the light rail is possible to damage the vehicleelectrical system or, alternatively, you can blow the fuse. A good alternative is to place itdirectly from the battery of the car and switch the power through the relay coil halogenlamps which connected in parallel to the antenna output power or control of existing equipment.

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As seen in the design, the only active component is an integrated circuit TDA7386, SGS-Thomson. It provides four channels of amplification from a 12v source. The DC input is blocked from 0.1μF capacitor. STBY mute control terminal and may or may not be implemented, is up to you. Output is symmetrical, so there is no speaker terminal is grounded (both amplified).

Cooling:
Heatsink should be enough to keep the chip in the appropriate temperature. You can use a Pentium III with a cooling fan.It is sufficient to connect to Vcc as used 12v like the amplifier.

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The input IN is connected to the output of the receiver, U output is connected to the speaker as shown on car audio amplifier scheme. It is very important to ensure that the speaker has no connection tothe chassis (ground) if not, the integrated circuit IC1, a TDA 2004 will soon be damaged. For mounting, carefully follow the implementation of the car audio amplifier scheme for the components. The power supply will keep with 12 volts.

Parts list :

All resistors are 1/4 watt unless otherwise stated.
R1 = 100 Ohms
R2 = 1.5 Kohm
R3 = 180 ohms
R4 = 470 ohms
R5 = 10hm
R6 = 10hm
Cl = 0.1 pF pol.
C2 = 1000pFceramique.
C3 = 10uF / 16Velec.
C4 = 0.1 uFpol.
C5 = 0.22 uF pol.
C6 = .22 uF pol.
C7 = .22 uF pol.
IC1 = TDA2004
A heat sink

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However, it is able to deliver 70W output power signal (music) in the dynamic condition. As we can see from the drawings and  schematic diagrams, this powerful amplifier uses only few part.

As we can see from the schematic drawings and diagrams, this powerful amplifier uses only few part. It is built on a PCB size 104mm x 39mm, but even though its size may be simple, but not with his ability. This amplifier also has excellent noise and distortion. An important components of the circuit is an integrated circuit TDA1562Q “monolithic integrated Bridge Tied Load (BTL) class H power amplifier with high efficiency.” Form in17-pin package “DIL-bent-SIL” plastic and not only designed for use in car audio amplifier and portable PA but it works for network applications, for example, mini / midi audio components and for TV sound.

PCB :

Technical feature:
Output power 36W RMS: ———————- 4R
70W music power: —————————– 4R
Frequency response: 28Hz to low ———–1dB and 55 kHz
130mV input sensitivity: ——————— RMS (36W for 4-ohm)
Harmonic distortion: ————————– typically 0.2% (see charts)
SNR 95dB unweighted: ———————— (22Hz to 22kHz)

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5.8 W Audio Power Amplifier Parts list :
R1 : 100K variable
R2 : 27K
R3 : 220
C1 : 4.7uF/50V
C2, C7 : 470u.16V
C4 : 100nF
C5, C6 : 47uF/16V
IC TA7222AP

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This TDA 2005 IC was designed specifically in car audio system for power boosting applications. This IC has a protection against short circuit and overheating. In the above circuit use a bridge configuration that will deliver 20W of output power with 2 ohm speakers. This 20 Watt Power Amplifier circuit requires a power supply voltage 14.4 volts .

Parts list :
R1 : 120 K
R2 : 1K
R3, R4 : 1 ohm
R5 : 2K
R6, R7 : 12 ohm
C1, C9 : 2uF
C2 : 10uF
C3, C8 : 220uF
C4, C7 : 100uF
C5, C6 : 0.1uF
IC : TDA 2005

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In many cars, cassette players use amplifiers that power does not exceed 5W with enough distortion to the limits of power. The problem is solved with the use of external amplifiers will have the opportunity to earn much more power with much less distortion. Given the voltage of the car is +12 V, we have the opportunity to take power over a threshold. The solution is to use two amplifiers in bridge connection, so the output quadrupled, at least theoretically, and at best, doubled.

A complete set will be much easier to implement the above, easily and with very few external components, is the TDA1516Q, which contains two amplifiers in a shell, with a profit of 20dB, with protection against overheating and short circuiting. In connection bridge as in the circuit, we can output 18W at 4 Ohm load, with 0.5% distortion and power over 20W by deformation close to 10%, power good for the car. The drive amplifiers can be accessed from the output of existing amplifiers. You may need to engage in a series potesometro, which will adjust the level to a level so as not to have distortion from overdriving. This circuit can be used for purposes other car, driving a small computer speakers. The amplifiers should be placed on a good heatsink.

Parts list :

C1-2 = 220nF 100V MKT
C3-4 = 100nF 100V MKT
C5-6 = 2200uF 25V
D1-2 = 1N5408
F1 = 3A Fuse
IC1-the 2nd = TDA1516Q
S1 = 2X2 SW
M1 = Loudspeaker on the 2nd-30W / 4ohm

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Features :
· High output power
· Low offset voltage at output (important for BTL)
· Fixed gain
· Good ripple rejection
· Mute/stand-by switch
· Load dump protection
· AC and DC short-circuit-safe to ground and VP
· Thermally protected
· Reverse polarity safe

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Key features :

This chip is recommended for use in the entry-level subwoofer in your car. And the scheme presented is optimized for this application. Although, of course, no one bothers to play with it a full signal.

Parts List :
R1,R2,R3 : 10K
R4 : 1K
C1,C2 : 0,22uF
C3 : 10uF/16V
C4, C5 : 10000uF/25v
C6 : 0,1uF
C7 : 4700uF/25V
VT1 : KT3107
HL1 : any
DA1 : TDA1562

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