Pentru amplificatoare de putere cu transformatoare toroidale zgomotoase. Reduce HUM-ul deranjant cauzat de interferentele cu restul aparatelor din casa.

Descriere:

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 (http://sound.whsites.net/articles/xfmr-dc.htm).

Proposed PCB is a successor of the very successful second 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).
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.

In the current 3-rd PCB version is incorporated the ability for mounting of 6 high-power discrete diodes which rises the DC blocking voltage up to 2V.