This article is dedicated to those Audio Amplifier enthusiasts who want to bring the good old time back into their own private home by building their own powerful stereo transistor amplifiers from scratch. The circuit design is for a 1000W stereo audio amplifier, known for its excellent assembly quality and ease of construction. The design is straightforward, from the PCB layout to the selection of components. The output transistors used are the complementary pair 2SC5200 and 2SA1943, which are both affordable and deliver impressive performance.
In the power supply module, six 4700uF/80V (or higher) capacitors and a 50A bridge rectifier diode are employed. This design can be configured as either a mono (500W) or stereo (1000W) amplifier. For a stereo setup, it is recommended to use a transformer with at least 8 Amperes and a voltage of -50V -0- +50V with a zero centre. The transformer can be either toroidal or conventional.
1000 W Transistor Stereo Amplifier Parts List:
| Transistors | Qty. | Resistors | Qty. |
| 2SC5200 | 10 | 2.2 Ω – ½ W | 20 |
| 2SA1943 | 10 | 0.33 Ω – ½ W | 20 |
| C2073 | 4 | 10 Ω – 1W | 4 |
| A940 | 4 | 100 Ω – 1W | 4 |
| 5.6 kΩ – 1W | 4 | ||
| 100 Ω – ¼ W | 10 | ||
| Capacitors | Qty. | 330 Ω – ¼ W | 4 |
| 4700 uf / 80V or more | 6 | 1 KΩ – ¼ W | 4 |
| 100 uf / 50V | 6 | 18 KΩ – ¼ W | 4 |
| 1 uf / 50V | 2 | 33KΩ – ¼ W | 2 |
| 100 pf (Ceramic) | 2 | 56KΩ – ¼ W | 2 |
| 15 pf (Ceramic) | 2 | ||
| 330 pf (Ceramic) | 4 | ||
| 680 pf (Ceramic) | 4 | ||
| 220 pf (Ceramic) | 4 | ||
| 0.1 uf (104) / 250V Polyester | 2 | ||
| 0.1 uf (104) / 100V Polyester | 5 | ||
| Miscellaneous | |||
| Integrated Circuit TL071 or UA741 | 2 | ||
| 15 Volt to 1 W Zener Diodes | 4 | ||
| 1N4007 Diodes | 4 | ||
| Bridge Diode – 35 A or more (Best if it’s 50A) | 1 | ||
| Small 2-Pin GP Connectors | 2 | ||
| Large 3-Pin Molex Connectors | 2 | ||
| Large 6-Pin Molex Connectors | 2 | ||
| Transformer +50V x -50V or up to +55V x -55V with centre tap and 15 Amps | 1 | ||
| 8Pin IC socket | 2 | ||
| Sinks of 22x10x2.5 cm | 4 | ||
| Mica insulation | 24 |
1000W Stereo Audio Amplifier PCB Design
Power Supply PCB Design for 1000W Stereo Audio Amplifier
1000W Stereo Audio Power Amplifier Channel Connection
Good Luck with your New Amplifier, just don’t disturb the neighbours with this playing annoying oompa oompa!
