Is there's a way for you to safely measure your mains input, in front of the isolation transformer, then measured again after the transformer? This will help in understanding what this isolation transformer resolves for your audio setup. However, we could both purchase few 1000 EUR power cables anytime. The price you paid is a really low indeed, I paid about 100 EUR myself for my isolation transformer (250 VA, 150 Watts). PS The most difficult task is the sourcing for the transformers, as these "symmetrically balanced isolation" ones are not very common within the manufacturer standard catalogs. in the case of 120VAC one gets +60VAC and -60VAC on the outgoing section.Įasy, funny, but most of all, a "straight-to-the-problem" solution with an incredible value for money ! The same principle can be applied to any incoming VAC, i.e. Manufacturers like Balanced Power Technologies, Bryston, Keces, ect., sell these units for thousands of $. I have tested the integration of filters (Schaffner #2070) but I prefer with no filter. I paid from 120 EUR to 250 EUR including shipment (2015) for each transformer from a French manufacturer, plus : the aluminum enclosures, the IEC sockets, wirings, circuit breakers on the outgoing, silent blocks, minor stuffs here and there, say from 300 EUR to 450 EUR depending the size each finished unit. The opposite polarity between L and N is due to completely cancel all common mode noise from the incoming AC line. The "new" AC line has then 115V on the L terminal and 115V on the N terminal, all that when referenced to the new center-tapped G ground, which remains at 0VAC. The incoming 230VAC (115V on the L terminal and 0V on the N and G ground) is split into halves on the transformer’s output. Transformer #3 for the HT setup's amplifierĪll are based on transformers with 2x screen magnetic shielding, so that the highest reduction on AC noise, which is the cause of ground loops, can be secured.Įach unit is configured for 230VAC (France) true balanced mode operation, so a 1:1 isolation transformer with a precisely placed center tap on the transformer’s secondary. Transformer #2 for the Hi-Fi setup's amplifier Transformer #1 for the sources of both Hi-Fi and HT setups So, after testing the 1st prototype, I have then build four units in total : These were so-and-so effective, but I felt the dynamic was also affected in some way. I decided to develop this upgrade after testing several Schaffner' filters with the intent to reduce the AC noise and electromagnetic interferences. my most useful upgrade on the main line so far by means of symmetrically balanced isolation transformers. True symmetrically balanced isolation transformer.
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