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:
18+18 Watt (TDA2030) Hi-Fi Stereo Audio Amplifier Circuit Diagram
Circuit Diagram:
Circuit Diagram Shows Only One Channel
| Part | Description |
| 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:
- Check your work for possible dry joints, bridges across adjacent tracks or soldering flux residues that usually cause problems.
- Check again all the external connections to and from the circuit to see if there is a mistake there.
- See that there are no components missing or inserted in the wrong places.
- Make sure that all the polarized components have been soldered the right way round.
- Make sure the supply has the correct voltage and is connected the right way round to your circuit.
- 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 |
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