Article
17 V/10 A Switch-Mode Power Supply
For the active multimedia subwoofer
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.
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 the Elektor PCB Service service from its business partner Eurocircuits or AISLER as the best services for its own prototypes and volume production.
The use of our Gerber files is provided under a modified Creative Commons license. Creative Commons offers authors, scientists, educators and other creatives the freedom to handle their copyright in a more free way without losing their ownership.
PCB
Component list
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
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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