400 Watt 70 Volt Amplifier Part List

Transistors

• 2SC5200 or equivalent MJL21194 : 8
• 2SD718 or equivalent C5198 : 1
• 2SB688 or equivalent A1941 : 1
• 2SC2229 or 2SC2230 : 2
• A1015 or A872 : 2
• TIP42 : 1

Capacitors

• 6800uF/80V or 10000uF/80V Electrolytic Capacitor : 2
• 100uF/80V Electrolytic Capacitor : 2
• 2.2uF/50V Electrolytic Capacitor : 1
• 10pF ceramic capacitor : 2
• 470pF (471) ceramic capacitor : 2

Resistors

• 0.33 ohm 5W : 8
• 4.7 ohm 1W : 8
• 100 ohm 1W resistors (brown, black, brown) : 2
• 33 ohm 1/4W (orange, orange, black) : 1
• 150 ohm resistors at 1/4W (brown, green, brown) : 3
• 10K ohm 1/4W Resistor (Brown, Black, Orange) : 1
• 1K ohm 1/4W Resistor (Brown, Black, Purple) : 1
• 4.7K ohm 1W (yellow, violet, purple) : 1
• 68K ohm 1/4W (blue, green, orange) : 2
• 33K ohm to 1/4W (orange, orange, orange) : 1
• 3.3K ohm 1/4W resistors (orange, white, purple) : 2

Diodes

• Diode bridge of 15 amps or greater : 1
• Diodes 1N4007 : 3
• Zener Diode of 18 volts or 24 volts : 1

Others

• Fuse holder and fuse of 3 amperes.
• Transformer for the amplifier should be 55 + 55 volts AC with a current of at least 10 amps.

400 Watt 70 Volt Amplifier PCB Layout Design

This is the PCB layout for 400w pawer audio amplifier. The power supply is already included in the printed circuit board although in the schematic design, the power supply was not included. Please refer to the connection image in the end of this post.

400 Watt 70 Volt Amplifier Top PCB Design and Component Layout

400W Power Amplifier Connection

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This is the circuit diagram of 150W power amplifier which built using power transistors. The circuit above is essentially a mono channel circuit. To make it into a stereo channel, you have to build the two identical circuits. 150W is high enough for the audio system in a small field or in the hall/meetinghouse.

150W Power Amplifier Note

To maintain performance remains excellent and prevent damage to the power transistor caused by excessive heat, then you must install the heatsink on the transistor Q7 to Q12.

On 150W power amplifier circuit schematic above is included the simple power supply circuit that very easy to built. Transformer to use is 3A minimum for mono applications, and 5A minimum for stereo applications. For better performance, maybe you could try using a regulated power supply that is certainly capable of providing a large current and voltage as needed by this power amplifier circuit.

The post 150W Power Amplifier using Transistor appeared first on Amplifier Circuit Design.

This the circuit diagram of 260W power audio amplifier capable of delivering up to 260W RMS at 8 Ohms load. The signal level of 1 VPP standard amplitude is input to a differential stage composed of BC556C Transistor. Then the signal is input to the post-formed by complementary transistors in order to achieve the desired power.

All transistors except BC556C, should be mounted on a suitable heatsink to prevent overheating. It would also be ideal to mount the plate in a metal cabinet to prevent unwanted noise.

This power amplifier uses complementary transistors in order to achieve the desired power. It is powered by a dual polarity power supply of +/- 45V and consumes 4 amperes, the circuit diagram provided. ALL diodes labeled A, B and C in the amplifier scheme diagram are 1N4001 and also be mounted on the heat sink but with silicone grease. The entry should be 1 Volt to deliver full power.

The power supply can not be regulated, but the filter must be very good to avoid “hum” in the speakers.
In this case the transformer has a secondary with midpoint of 32V / 0V / 32V (center tap). For mono configuration must have a current of 4A, 8A stereo. The diodes must be at least 100V by 6A (mono) to 12A 100V (stereo), you may use bridge amplifier for the rectifier diode. The capacitor should be minimum of 4700μF x 63V each.

The post 260W Power Audio Amplifier appeared first on Amplifier Circuit Design.