A simple low power car stereo amplifier circuit based on TDA 2003 is shown here. The circuit uses low-cost, readily offered parts and it's very simple to construct. TDA2003 is an integrated car radio amplifier from ST Micro electronics that contains a lot of excellent features like short circuit protection for all pins, thermal over range low harmonic distortion, low cross over distortion etc.
In the circuit given here every TDA2003 is wired as a mono amplifier operating from a 12V supply. Resistors R2 and R3 forms a feedback network that sets the amplifiers gain. C7 is the input DC de-coupling capacitor and C5 couples the speaker to the amplifiers output. C4 is employed for improving the ripple rejection while C1 and C2 are employed for power supply filtering. C3 and R1 are used for setting the higher frequency cut-off. Network comprising of C6 and R4 is employed for frequency stabilization and to stop oscillation.
In the circuit given here every TDA2003 is wired as a mono amplifier operating from a 12V supply. Resistors R2 and R3 forms a feedback network that sets the amplifiers gain. C7 is the input DC de-coupling capacitor and C5 couples the speaker to the amplifiers output. C4 is employed for improving the ripple rejection while C1 and C2 are employed for power supply filtering. C3 and R1 are used for setting the higher frequency cut-off. Network comprising of C6 and R4 is employed for frequency stabilization and to stop oscillation.
