DC Blocker Trap Filter – Populated PCB – v.2

Fully populated and tested DC Blocker/Filter/Trap PCB

 50.00  46.00

  • USD: 52.13$

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. It is a successor of the very successful first version of the board.

It retains some of the  previous board specifications:

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

but now the board is TWO-layer design which allows the current handling capabilities of the board to be doubled. All current conducting traces are widened as much as possible which additional raise the max. handled current.
PCB has solder mask coating on top and bottom layer for best durability.

DC Blocker is built with following parts:
– two MASSIVE 47 000 uF EPCOS capacitors (the bigger is capacitance, the higher are handled currents)
– one high-current Rectifier Block
– 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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