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5 volts from the Mains

5 volts from the Mains
5 volts from the Mains
Sometimes we would like to hide certain equipment to prevent cluttering up our living room or any interior in general. A number of devices lend themselves to be built into a wall adapter. Think of a remote-control extender, for example.All these devices need a power supply and we would prefer to use the mains so that no external connections are required for the power supply.The power supply in this article is intended for exactly these situations, namely converting the mains voltage to a 5-V power supply voltage. The accompanying PCB fits exactly in a round wall socket enclosure.

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Materials

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.

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PCB

Extra info / Update

Although it is stated in the article that constructors must make sure “no conductive parts can be touched when the circuit is in use.” we should have added:The circuit powered by the proposed supply must be incorporated in the same, electrically safe, enclosure as the supply in such a way that no component can be touched. Never, under any circumstances, should the proposed supply be used to power external circuits requiring a supply of 5 volts.

Component list

Resistors:
R1 = 10k
R2 = 39k
R3,R4 = 150k
R5 = 33
Capacitors:
C1 = 220µF 63V radial
C2 = 120µF 25V radial
C3 = 100nF
Semiconductors:
B1 = B250C1500, round case
D1 = zener diode 39V, 0.5W
D2 = MBR745
IC1 = LM2595T-5.0
T1 = BC547B
T2 = IRF730 or BUZ41A
Miscellaneous:
F1 = fuse, 100 mAT (slow), with PCB mount holder and cap
K1 = 2-way PCB terminal block, lead pitch 7.5mm
L1 = 100µH choke
PCB, available via The PCBShop

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