PCB for DC Trap Blocker Filter for toroids – v.2

PCB for DC Trap Blocker Filter for toroidal transformers (toroids)

 12.00  9.00

  • USD: 10.20$

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 (

Proposed PCB 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.
Silk screen with parts layout is placed on the top of the PCB.

PCB has following abilities:
– Diodes with 3 different bodies can be mounted on it – DO-201, TO-220 or rectifier blocks.
– Rectifier block can be KBU8K or GSIB2580 types.
– Electrolytic capacitors are snap-in with lead spacing 10 mm. and max. outer diameter 40 mm.
– Resistor R1 can be 5 or 10W rated power with lead spacing 28 or 53 mm.
– Bypass capacitor C3 is WIMA MKS4 400VAC with lead spacing 15 or 22.5 mm.
– AC input/output connectors can be of the following types:
a) MOLEX 3- or 5-pins terminal blocks
b) 3-pins Barrier Terminal Blocks with pitch spacing 8.25 or 10 mm.

All parts used are easily obtainable from big supplier stores (Mouser, Farnell, Digi-Key etc.) or via e-bay.

Note: the listing is for PCB only – pictures of assembled device is for information purposes only!

Schematic and parts list will be sent to the buyer’s PayPal address after purchase. If for some reason a different e-mail address must be used, note it in the process of checkout.

Weight 0.050 kg

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