Seeing a Lampizator Silk for sale on SN recently lead me to do some Googling and inspired me to make John Rischs' power filter.
Parts became the biggest challenge. I could not find any reference to the description of the ferrite ring Lukasz used and there were some comments of the ferrites recommended by John Risch degrading sound. I ended up using the Epcos ring as being closest to what Lukasz suggested and that was readily available. The T38 has high permeability and optimised for between 100kHz and 1MHz. The Kitagawa TRM 38-19 13E WE also seems suitable butI couldn't readily purchase it. Next were the capacitors. Mallory, Wima and Rifa were recommended but I discounted all for various reasons, either some brands didn't have the full range required or the leads were too short. I noticed that Lukasz had used ceramic caps in the Silk photos where John Risch spec'd metal film polyester X2 caps. The metal film caps are recommended because of reliability for continuous use. John Risch should also have recommended Y2 caps between N-G and L-G. Vishay caps ended up being the most suitable both in spec and availability. John Rischs'schematic using the Y2s before the ferrites is cheaper, using only one set as opposed to four in Lukaszs' scheme although Lukaszs' photos show the Y2 caps before the ferrites, contradicting his scheme.
List of parts: all available from Mouser
Vishay polyester capX2 continuous axial 250VAC CTOL 20% leads 40mm
F1773 3102000 0.01uF
F1773 4102000 0.1uF
polyprop cap Y2 continuous radial 300VAC CTOL20% leads 25mm
MKP 338 6 Y2
Epcos ferrite ring T38 B64290L668x38
Phoenix contact terminal blocks
UT4-3044102 Grey
UT4BU- 3044115 Blue
UT4PE-3044128 Earth
FBS 10-5-3030213 10 pin bridge
UK 35N 1202577 end clamp
Aluminium enclosure 88 x 167 x 250 Szomk brand from Aliexpress 'Asia Quality Enclosure' they spec'd anodised but silver spray paint and ends were warped - I bent back to shape. Gave them three stars.
DIN rail and plastic 40mm Clipsal conduit saddles from local electrical wholesaler.
Mounted on 5mm acrylic. Some 2.5mm house wire. Cable glands to suit cable diameter of your power cable. I used PG16 to clamp Acrolink 7N P4030-2 cable.
Note: trying to jamb wires from this size cable and two lots of 2.5mm wire into UT4 terminal blocks is challenging.
Also some skill required to modify alloy enclosure ie. removal of one of the screw ports and to enable other screw port to hold/slide the acrylic base. The base is electrically and mechanically connected to the enclosure by one bolt through the DIN rail - visible on close inspection of the last photo (technically, the earth terminals don't need to be wired together because they all electrically bite the DIN rail)
