Here is a stereo power amplifier based on the single chip STK4141II. This stereo amplifier circuit will provide 25W audio power on each output channel.
The recommended voltage for 8 ohms speakers is 27.5V and for 4 ohms speakers is 24.5V, while the maximum voltage to power this circuit should be about 41 VDC. This circuit is powered from a bipolar (symmetrical) power supply, so a center tapped type transformer should be used. Use a minimum 2A transformer for better results.
A heat sink must be used on the power IC to prevent overheating and maintain good performance of the STK4141II.
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