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Universal Mains Filter

Universal Mains Filter
There are plenty of mains filters available, with or without sockets, with or without a switch, etc. In any case, this filter is very versatile as far as the maximum working current is concerned. It so happens that the footprint of the coil remains the same for different currents. Depending on the required specification, you can use a specific coil (which the manufacturer calls a ‘Current-Compensated Ring Core Double Choke’). The table below lists a suitable range of coils made by Epcos. When we designed the PCB we chose the smallest size that still gave a wide selection of maximum currents.
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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.

R1,R2 = 470kOhm
C1,C2 = 10nF 275 VAC X2, lead pitch 10 or 15mm
C3,C4 = 100 n/275 VAC X2, lead pitch 15mm
L1 = B82721-A2401-N20, Epcos (Farnell 976-477)
K1 = 3-way PCB terminal block, lead pitch 7.5mm
K2 = 2-way PCB terminal block, lead pitch 7.5mm
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