DC Blocker Trap Filter – Populated PCB

Fully populated and tested DC Blocker/Filter/Trap PCB

 49.00  45.00

  • USD: 53.76$

Nowadays the AC mains network is heavily polluted by various domestic appliances, industrial electrical consumers etc. This can lead to buzzy toroidal transformers (especially the power ones). Proposed DC trap (blocker, filter) will remove or at least lower the buzzing.
Schematic is similar to this one used in well known Vladimir Shushurin’s Lamm-1 amplifier. An article with in-dept explanation of how DC blockers work can be found on Rod Elliot’s site (

Here is offered fully populated and tested DC Blocker PCB which is ready for plugging into your system.

Dimensions of PCB: 88×94 mm.
PCB thickness: FR4 2 mm. Copper thickness: 70 um (2oz). Surface finish – Nickel Gold (ENIG).

DC Blocker is built with following parts:
– two MASSIVE 33 000 uF EPCOS capacitors
– four high-voltage diodes HER605
– one 10W power resistor
– one WIMA MKS4 400VAC capacitor
– two MOLEX 3-terminal connectors for AC input/output
– one PCB for DC Blocker.

All parts used are freshly obtained from reliable sources (Mouser, Farnell, Digi-Key etc.).

Weight 0.25 kg

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