• on Audio/Video/Photography
  • Published in issue 3/2003 on page 0
About the article

17 V/10 A Switch-Mode Power Supply

For the active multimedia subwoofer

17 V/10 A Switch-Mode Power Supply
This compact stabilised power supply was specifically designed to obtain the best performance from the recently described subwoofer that forms part of our Active Loudspeaker System. It produces the ideal supply voltage of exactly 17 V, is capable of sourcing up to 10 A and has an excellent efficiency.In the article for the active subwoofer we already mentioned that there were two choices for the power supply: the usual combination of a transformer, bridge rectifier and smoothing capacitor, or a stabilised 17 V supply. We promised to publish a design for this in the near future, and here it is.
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Gerber file

CAM/CAD data for the PCB referred to in this article is available as a Gerber file. Elektor 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.

Resistors:
R1,R4 = 2k?2
R2,R5 = 2k?21
R3 = 14k?7
R6 = 14k?3
R7 = 0?1 5W
R8 = 6k?8
P1 = 1k? preset
Inductors:
L1,L2,L3 = 100µH 5A, e.g., SFT12-50 (TDK)
Capacitors:
C1-C4 = 47nF
C5,C8,C10,C12-C15,C19 = 100nF MKT (metallised film)
C6,C7 = 1000µF 63V radial
C9,C11,C16,C17,C18 = 220µF 63V radial
Semiconductors:
D1-D6 = MBR745 (Schottky diode, 7.5A 45V piv)
D7 = LED, high-efficiency
IC1,IC2 = LT1074CT (Linear Technology)
Miscellaneous:
K1,K2 = 2-way CB terminal block, lead pitch 5mm
F1 = fuse, 2A/T (time lag), with PCB mount holder
PCB, order code 020054-3
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