Here's a simple LM3886 (LM3886TF) hard-wired amplifier I built during 3 evenings for my wife's ex Microlab Solo computer speakers (modded). I wanted to build it as fast as possible and using only parts I had at hands. Because the speakers aren't super powerful and never used aloud I took a simple $3 polystyrene box for the case and two old heatsinks for Pentium processors for cooling. I also had a power transformer taken from the Solo's dead amp. Originally I wanted to use inverted schematic with op-amp buffers (you can see a card with the buffers on the photo). Then I realized that it makes the box too tight and adds more hum because the transformer is too close to the electronics. So I took the buffer out and converted the amp to normal (non-inverting) gainclone. Without buffer the inverting schematic was oscillating at radio frequencies producing a lot of heat. Later I also removed DC blocking caps as the amp is intended for use with PC sound card which already has output caps. The switch the between volume knob and the headphone socket switches wires from input jacks between amplifier and headphones, i.e. headphones are powered directly from sound card.