![]() The power supply is very simple – a bridge rectifier and 4 x 10 000uF/50V capacitors. The transformer is a little weak for this amplifier, maybe 150W or 200W would be a better choice. The test was ran with 8Ohm dummy load and the big heat sink gets only warm after hours of playing music from my computer at max volume. It can be regular electrolytic capacitor, but it’s better to use non-polarized or bipolar. I used 47uF/63V non polarized capacitor for C2. The diameter of the wire must be minimum 0.4mm. I made the output inductance L1 by winding 15 turns of enameled wire around the resistor R7. I removed the time delay capacitor connected to MUTE pin, because it’s better to use separate DC protection schematic which has similar functionality. The schematic is based on the schematic in the datasheet of the chip with minor changes. I was pleased of the sound this chip produced the first time, so I decided to make another amplifier with it. This project is an audio amplifier based on LM3886. ![]()
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