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.

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Tone Control for 150W Car Audio Amplifier

The tone control circuit build based on IC LF353 In stereo mode, we shall have the action of eight loudspeakers which are going to create a very important sound pressure.

Tone Control Scheme

Tone Control PCB Design

150W Car Power Amplifier

The power amplifier is built based single LA47536 power IC for each channel. For stereo channel you need two similar circuit for each modul (tone control and power amplifier)

The LA47536 is a 4-channel BTL power amplifier IC developed for use in car audio systems. The output stage features

• A pure complimentary structure that uses V-PNP transistors on the high side and NPN transistors on the low side to provide high power and superb audio quality.
• The LA47536 includes almost all the functions required for car audio use, including a standby switch, a muting function, and each protection circuit. It also provides a self-diagnosis function (output offset detection).

Power Amplifier Scheme

Power Amplifier PCB Design

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