Ton Giesberts
About the article

transformer board

for the Audio DAC 2000 and many other circuits

transformer board
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.
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Gerber file

CAM/CAD data for the PCB referred to in this article is available as a Gerber file. Elektor GREEN and GOLD members can exclusively download these files for free as part of their membership. Gerber files allow a PCB to be produced on an appropriate device available locally, or through an online PCB manufacturing service.

Elektor recommends its business partner Eurocircuits as the company of choice for its own prototypes and volume production in selected cases.

Component list
C1,C2,C3 = 100nF 275VAC class X2, raster 15mm
L1,L2 = 2 x 27mH/0.4 A e.g., Siemens type B82721-K2401-N21
K1 = 2-way PCB terminal block, raster 7.5mm
K2 = 3- way PCB terminal block, raster 5mm
K3,K4 = 2- way PCB terminal block, raster 5mm
F1,F2 = fuse 32 mAT (slow), with PCB mount holder
Tr1 = PCB mount mains transformer
2 x 15 V/4 VA, e.g., Block FLD4/15; Hahn BV UI 302 0165; Monacor FTR-415. *
Tr2 = PCB mount mains transformer 2 x 8 (or 9)V/4 VA, e.g., Block FLD4/8 or FLD4/9; Hahn BV UI 302 0161; Monacor FTR-49.
PCB, order code 000001-1
*) Hahn and Monacor series not short-circuit resistant. Block series short-circuit resistant.
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