2x30W stereo audio amplifier
Built: December 2002.
It is an amplifier card to the PCI slot, and a bonus AT power supply to the PC.
The bonus ps, must be built in, because of the ground loops, and supply noises, generated by CD-ROM, and HDD. This supply has been changed, to produce a 16V DC voltage for the amplifier, and to can be switch on/off when the PC turns on/off. It works with a TDA1554 stereo amp. ic.
In electrically, it doesn’t connect to the PCI slot. It just holds that. Volume control: just from the Windows audio control panel, via the soundcard output level.
You can download some plans: PC amp.ace