ZoltriXound PC speakers

Cheap PC speakers from ancient times.

2W, 4Ohm speakers, magnetically shielded

601M marking
By the date on the plastic it looks like speakers were made in 2002.

EPC-S601M310
881015 VER 1.0

Transformer: ETS-S2BO9021
230V/9V, 0.2A

Idle voltage from transformer is close to 12V RMS, after rectifying ~15.4V and dropping by ~1V when playing. Transformer is heating quite a bit.

SP2822 amplifier (most likely equivalent of TDA2822M)

 Amplifier should be able to provide few hundreds mW per channel, although it seems to be working outside of specified voltage / load impedance range.

Apparently soldering wires on copper side was faster / cheaper.

470u for power supply filtering,
220u at output