TDA2003 10W audio amplifier circuit

This is a HI-FI power amplifier circuit using popular TDA2003-IC from SGS Thomson. The normal operation of the integrated circuit, the music amplifier for car audio radio sound.

Which it uses a supply voltage from a 12V car battery. But this circuit is adapted for use in a home. With changing the power supply voltage to 18V.

So, this IC can easily deliver 10W to a 4Ω load speaker.

This allows a higher watt power than the existing 3watt RMS.The TDA2003 IC is protected from damage and short circuits,When the load over.Maximum Voltage of 28 volts, the frequency response 40 Hz – 15 kHz.

Hi-Fi audio amplifier using TDA2003

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When entering the power supply 15 volts to the circuit. The C1 coupling audio signal through the VR1 to adjust the volume.Then sent to the C2 anti-noise DC input signal to the pin 1 of IC.The non inverting amplifier circuit is a non-return phase.This is the signal output pin 4, by a C5 enhances the stability of low-frequency response the better.And noise will be dropped down to ground by R4 and C6 before output to speakers.Another part of the output signal, which is fed back through C3, and R1, to enter the pin 2 inverting.To maintain a constant frequency response at-3dB.And if you want to add. Frequency response is to reduce the C3.The C8 is a filter file before the operation.C7 cut out noise from the supply.If you want a stereo amplifier,Is to create an additional set.

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Edwin van den Oetelaar

C3 in your schematic is 470 microfarad, which is way too large. A better value would be about 39 nano farad. Do the math, what do you think the gain will be with this capacitor? (Too low)


2SC2058 using adio amplifier circuit diagram


We have a project on amplifiers for our finals and this schematic worked out fine and dandy! Cheers mate! 😀


ap ne capaciters k volt ni bataye
you have not mentioned capacitors volts

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