18W + 18W Stereo Hi-Fi Audio Amplifier (TDA2030)

2 x 18W Hi-Fi Stereo Power Amplifier based around two TDA2030 ICs. It has good input sensitivity, low distortion, good operating stability and full protection against overloads and output short-circuits. It can be used as a booster amplifier for existing small systems or to drive a second pair of speakers besides the ones already connected to the system. The board needs a symmetrical power supply of ±18Vdc/3A and can be connected to loads of 8 or 4 Ohm. Large heat sink is required for this circuit. Diagram shown below indicates only left channel. Make two circuits for for stereo version.

Picture of the project:

Circuit Diagram:

Parts:

R1 = 22K
R2 = 680R
R3 = 22K
R4 = 1R-1w
D1 = 1N4001
D2 = 1N4001
C1 = 1uf-25V
C2 = 22uF-25V
C3 = 100nF-63V
C4 = 100nF-63V
C5 = 100uF-25V
C6 = 100uF-25V
C7 = 220nF-63V
IC = TDA2030

If it does not work:

1. Check your work for possible dry joints, bridges across adjacent tracks or soldering flux residues that usually cause problems.
2. Check again all the external connections to and from the circuit to see if there is a mistake there.
3. See that there are no components missing or inserted in the wrong places.
4. Make sure that all the polarized components have been soldered the right way round.
5. Make sure the supply has the correct voltage and is connected the right way round to your circuit.
6. Check your project for faulty or damaged components.

Technical Specifications:

• Supply voltage = ±18Vdc/3A symmetrical (see text)
• Current consumption = 3A maximum
• Input impedance = 500K Ohms
• Input sensitivity = 250 mV
• Signal to noise ratio = 80 dB
• Frequency response = 20 - 20,000 Hz ± 1 dB
• Distortion = 0.5 % maximum
• Load impedance = 4 - 8 ohm