Electronics Projects, Stereo Tone Controlled 12V Amplifier Circuit with TDA2003 article
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This audio amplifier circuit using the TDA2003 integrated circuit which has the same configuration and pinouts of the TDA2002. The interesting thing is that this integrated uses very few external components, assembly is very simple, low cost and uses little space. The TDA2003 amplifier IC provides an output current up to 3.5 A, very low harmonic and cross-over distortion. Has short circuit protection DC and AC, thermal protection above the permissible range, load dump voltage surge up to 40V and incidental breaks ground.
TDA2003 Amplifier Circuit Schematic
NOTE: The integrated output TDA2003 must be attached to an aluminum heat sink for the heat emitted by them is dissipated. If you put the heatsink, integrated tightly screwing on, surely the amplifier will burn in a few minutes.
4558 Preamplifier Schematic
The main component of the preamplifier with tone control circuit is the integrated circuit C4558. The original is the integrated enterprise JRC4558 New Japan Radio Co., but they say only (C), at good quality as other brands. The 4558 is a dual op amp low noise. It is one of the most used in professional audio for excellent response and defined sound. You can use other replacements as the TL072, but the sound is not the same, although it is also good.
source: construyasuvideorockola.com TDA2003 amplifier PCB schematic alternative link: stereo-tone-controlled-12v-amplifier-circuit-with-tda2003.rar