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 (https://sound-au.com/articles/xfmr-dc.htm).
Here is offered device capable to handle VERY HIGH CURRENTS (up to 30 Amperes intrinsic handled current!!!) assembled in a steel case – black powder coated.
Because of such high currents using a standard PCBs is not possible. Instead of that a 2mm. thick pure copper bussbars are used to connect the filter’s parts.
In order to carry such high loads the part’s values are upraised with 4 x 47 000 uF capacitors, 25W power resistor etc. For further description of the High-Power DC Blocker see here: High-Power DC Blocker Unit
Note that the Blocker undergone a redesign and now it has 6 discrete diodes which allows it to block DC shifts up to 2V!
The capacitor block is firmly connected to the bottom of the case with brackets and rubber sheet.
The input AC connector is Schurter C20 or C14 IEC Inlet. The type of the input AC connector determines the unit’s max. handling current – 20A with C20 IEC inlet and 10A with more widespread C14 inlet.
There are two high-quality AC outlet located on the front panel along with the IEC AC Inlet. Each AC inlet can handle not less than 13A AC output current.
The customer can chose between EU Schuko, UK, US, French, Australian, Switzerland and even exotic Brazilian style AC Outlets.
There are 4 rubber feet on the bottom of the case which ensure that case will not scratch the underlying surface.
Unit’s weight: 3 kg.
What the buyer will receive:
The package will contain 1 pcs. FULLY ASSEMBLED and tested HIGH-POWER DC trap/blocker/filter for toroidal transformers (toroids) in steel case.
The unit will be shipped with Priority AirMail Registered (or equivalent courier service where applicable). The tracking number will be sent to the customer after shipment.
Submit your review
I changed amplifiers recently to a very hi power unit (825W into 4Ohm) and felt it was starved of power using the standard DC Blocker. The hi power unit is hands down one of the best investments I have made to date. The sound stage exploded, the transients are noticeably better and the detail is just astonishing.
The blocker has really blown the lid off my musical experience. A must buy!