DC trap blocker filter for toroidal transformers - assembled in case - v.3

Description

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 "sound.whsites.net/articles/xfmr-dc.htm".
Here I'm offering you a fully assembled DC Blocker in metal case. It is a successor of the very successful second version of the unit
It retains most of the previous unit's abilities but for the first time now the customer can chose a board with
6 discrete diodes which increases the ability for DC blocking up to 2V.
The possible variant of DC Blocking voltages are given on schematic below:
Here I'm offering you a fully assembled DC Blocker in metal case.
Dimensions of DC Blocker
: 122x66x140 mm. (WxHxD).
Weight
: ~ 0.95 kg.
For detailed description of PCB please see my other listings.
This unit is currently supplied with a new version of PCB which has the following new features:
-
Two layers
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.
- Ability for mounting 6 high current diodes 10A4 which rises the
ability for DC blocking to approx. 2.4V
or standard high-current bridge rectifier with ability of DC blocking to approx. 1.6V. User must decide which version is more suitable for his needs. The standard variant of production is with bridge rectifier.
DC Blocker is built with following parts:
- two
MASSIVE 47 000 uF EPCOS capacitors (the bigger is capacitance, the higher are handled currents)
- 6 high-current diodes 10A4 (2V DC Blocking voltage) or one bridge rectifier (1.4V DC Blocking voltage)
- 10W power resistor
- WIMA MKS4 400VAC capacitor
- MOLEX 3-terminal connectors for AC input/output
- Schurter IEC power inlet with fuse
- Schneider AC Power outlet (Schuko, French, Euro-American, United Kingdom) or IEC C14 outlets
- steel case black powder coated
- 4 small rubber feet underneath the case.
As you can see from the pictures DC Blocker is offered in 5 different variants of AC outlet - Standard European (German Schuko type), Euro-American type, French type, United Kingdom type and with IEC C14 outlet.
Note
: Some of AC outlet types are not widely used in Europe, that's why please check for availability before committing the order.
Since some people need a more power, a DC Blocker version with
C19 IN and OUT Mains connectors
is offered too. This version does not have fuse and varistor on the input - just
C19 input socket -> DC Blocker board -> C19 output socket
. This allows the max. handled current to be raised to 15A.
And even if you think that all sockets (IN/OUT) just hamper the AC power, solution is offered: DC Blocker without Input/Output sockets but with cable glands for direct cable attachment to the board. Cables with outer diameter of 10 - 16 mm. can be attached to the Blocker via cable glands.
The terminal blocks used in the C19 and Cable glands versions are bigger than standard ones in order to accommodate cables
up to AWG-11
.
Note for United Kingdom customers (mainly):
Due to specific of the UK wall plug, attaching it to the Blocker can be uncomfortable sometimes when DC Blocker's AC Outlet is in the standard position. Hopefully it can be easily rotated to 90 deg.
clockwise
or
anti-clockwise
Of course such rotation can be done with all other AC Outlets too!
Just let me know what do you want upon purchase.
A surge protection with 275V rated varistor and 10A fuse (Schurter Slow-blow type) is incorporated at the AC input.
All parts used are freshly obtained from reliable sources (Mouser, Farnell, Digi-Key etc.).
NOTE
: Default variant of unit is with one Bridge rectifier - DC Blocking voltage of approx. 1.4V, which is enough in most cases. In case you need the ability for blocking even higher DC shift in the Mains, you can chose the variant with 6 discrete diodes, but
LET ME KNOW ABOUT IT,
please!!!!!!!!!!!!!
What the buyer will receive:
The package will contain
1 pcs. FULLY ASSEMBLED and tested DC trap/blocker/filter for toroidal transformers (toroids) in steel case.
The parcel will be shipped with PRIORITY Airmail
Registered
, so tracking number will be sent after postage.
Combined shipping with other my items is welcome - just use "ask a question" at the bottom of the page or "request a total from seller".