LM1036 Tone/Volume/Balance Circuit

The LM1036 is a DC controlled tone (bass/treble), volume and balance circuit for stereo applications in car radio, TV and audio systems. An additional control input allows loudness compensation to be simply effected.

Four control inputs provide control of the bass, treble, balance and volume functions through application of DC voltages from a remote control system or, alternatively, from four potentiometers which may be biased from a zener regulated supply provided on the circuit.

Each tone response is defined by a single capacitor chosen to give the desired characteristic.

Features

• Wide Supply Voltage Range, 9V to 16V
• Large Volume Control Range, 75 dB Typical
• Tone Control, ±15 dB Typical
• Channel Separation, 75 dB Typical
• Low Distortion, 0.06% Typical for An Input Level of 0.3 Vrms
• High Signal to Noise, 80 dB Typical for an Input Level of 0.3 Vrms
• Few External Components Required

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*http://www.ti.com/product/lm1036

Application Circuit.

• Cb and Ct capacitor pairs control the Bass & Treble tone response.You can use slightly different capacitors to your liking. Always use good quality capacitors in audio circuits.
• This circuit don't require Stereo Volume controllers.
• Use a good quality power supply (9V - 16V).You can use voltage regulators for better results. (78xx)

I used an old CD Drive as a casing.

STA540 Power Amplifier

"The STA540 is a 4-channel, class AB audio amplifier designed for high quality sound applications.The amplifiers have single-ended outputs with integrated short-circuit protection, thermal protection and diagnostic functions."

The STA540 is a 4 x 13 W dual/quad power amplifier which I found cheap,easy to build and provides good audio quality with low power consumption.By going through the data sheet you can design your own amplifier with this IC or you can get DIY kits online(Audio amplifier kit from sparkfun ).Use a big chunky heat sink.

For better audio quality use a pre-amplifier with a tone control.

Supply voltage: 8v...22v single DC

Power Output:

– 2x 38 W into 4 Ω at 18 V, 1 kHz, 10%THD

– 2x 34 W into 8 Ω at 22 V, 1 kHz, 10%THD

– 2x 24 W into 4 Ω at 14.4 V, 1 kHz, 10%THD

– 2x 15 W into 8 Ω at 16 V, 1 kHz, 10%THD

– 4x 13 W into 2 Ω at 15 V, 1 kHz, 10%THD

– 4x 11 W into 4 Ω at 18 V, 1 kHz, 10%THD

– 4x 7 W into 4 Ω at 14.4 V, 1 kHz, 10%THD

Application circuit for 2 channels:

 Application circuit for 4 channels:

Application circuit for 2 channels+bridge drive(can be used for a 2.1 system) :

In my project I used an old PC Power Supply as a casing. I kept the PS cooling fan so there is no need to use a large heat sink.

  

CONS:The multiwatt15 package could be problem if you are using a Veroboard.I had to bend the pins to get them aligned with a PCB.
'Apart from that very good chip.