Circuit Lake

Electronic Project and Circuit Collection

300W Power amplifier, Bridged-Paralleled

09/26/2010 Category: Amplifier, Analog, Audio, Project

The project goal is to create 300W audio power amplifier for 4-ohm DIY speaker with low distortion based on IC LM3886. It’s hope that the amplifier can produce deep, tight and punchy bass while keeping the excellent mids and highs from other gain clones.

300 Watt Amplifier

The schematic uses LM3886 in the inverted configuration, the reason is that user can use a trim pot to adjust the DC offset of each 3886. After some adjustment, The project able to get the DC offset of each 3886 to about 9mV, because this is a push pull configuration, the DC offset at speaker terminal would be very close to 0mV.