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PC 12-V Adapter

PC 12-V Adapter
This circuit can replace small mains adapters in the vicinity of the computer. This is particularly handy for devices that need a 12-V supply, such as active PC loudspeakers. The necessary 12-V supply voltage is taken directly from the PC power supply. In order to protect the PC supply against possible short circuits, and especially to prevent the PC from being crashed, a current limiting circuit is connected in series with the 12-V supply.
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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 = 0?1 5W
R2 = 390 ?
R3 = 12k?
R4 = 5k?6
Capacitors:
C1 = 100nF ceramic
Semiconductors:
T1 = BC560C
T2 = IRF9540 (see text)
Miscellaneous:
K1 = 4-way PC-supply plug, PCB mount (Farnell)
K2,K3,K4 = mains adaptor plug, PCB mount
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