The general-purpose transformer board described in this article has space for two small mains transformers, two mains filters and two fuse holders. As such, it will undoubtedly prove a boon and a practical aid in the construction of not only the Audio DAC 2000, but in that of many other circuits as well.Many readers will have noted (and some have indeed commented) that over the past few years the projects published in this magazine seldom provide space on the associated printed-circuit board for a mains transformer. One of the reasons for this is safety. Working with mains voltages is and remains a risky undertaking and not-too-careful constructors, especially the younger ones, run the risk that the potentially lethal mains voltage appears at places where it should not. Much of this risk is obviated by the use of discrete mains adaptors, as has been the case in most recent mains-operated projects.