But John pointed out that, unless the transformer is designed for low capacitance, as with these obsolete Topaz Ultra-Isolator transformers, common-mode noise that comes in from your mains will not be attenuated very well above 400 Hz. Prior to reading John Swenson's posts about the need for a low inter-winding capacitance, I had been very content with the lowering of my noise floor, as had with a modern Tripp-Lite is500 isolation transformer. John Swenson (of Uptone Audio) attributes their ability to remove power line noise from the higher audio frequencies to the very low inter-winding capacitance of these "30 Series" Ultra-Isolator transformers (per several posts he has made at This first chart shows that below 20 kHz, the attenuation of common-mode noise is even greater than -146 dB, going below -150 dB, at audio frequencies as high as 8000 Hz. They also provide 65 dB (1780:1) reduction of normal-mode noise. Greater than 146 dB (attenuation) throughout the audible spectrum, up to 20kHz, equates to a 20,000,000-to-1 reduction of common-mode noise. The following page, shows additional specs and some interesting performance curves, for the exact same transformers, re-branded under the Daitron logo. They are unique in that, unlike many other Isolation Transformers, including the Tripp-Lite is500, is1000, or is1800, which are still in production, the Topaz Ultra-Isolator -31 and -32 transformers have extremely low inter-winding capacitance, which equates to being far superior at removing common-mode noise from the treble frequencies.
DIFFERENCE TOPAZ CLEAN AND DETAIL PDF
Though long obsolete, the Topaz Ultra-Isolator "-31" and "-32" models ("30 Series") are readily available on the used market, at various VA ratings, as shown in the PDF at the link, above. Here's my Topaz Ultra-Isolator 91095-32, rated at 120V, 50/60 Hz, 500VA, with a low inter-winding capacitance of only 0.0005 pF (recently purchased used, on eBay): Other "Ultra-Isolator" models have higher capacitance ratings, with less noise attenuation. Note that only the "Series 30"models offer a 0.0005 pF inter-winding capacitance, which yields -146 dB attenuation of common-mode noise. Several Head-Fi members are already aware of some other forums where people have done a lot of trailblazing with the use of "Series 30" Topaz Ultra-Isolator Isolation Transformers, such as those shown in the following PDF. Nearly all of my own images use one of these filters.Have you been looking for a very effective, yet affordable solution for removing common-mode and normal-mode noise from your AC mains? How about a way to prevent noise from being injected back into the mains from your audio components' power supplies? How about a way to prevent ground loops between components and to discourage leakage currents? How about a way to remove any DC offset that might be coming in from the mains? And how about surge protection?
I get a small commission from any sales resulting from a click from this site (at no extra cost to you.) I really do love these filters. *Topaz Labs Filters is an affiliate link. Texture Collection: Autumn Rain Texture Collection. Save your stages so you can check as you go. You can see if you go too far, but it can be hard to see if you don't go far enough. (Color tweaked.)ĭon't be afraid to see how far you can push an image.
A Digital Paper Texture from the Love Ya Textures Collection.Just for fun, here's another version using: It's harder to see the differences in these smaller resolution onscreen graphics, but there is a marked difference in the higher resolution version in vibrancy, detail and contrast - and also a more illustrative look. I could have applied Precision Detail while I was in * Topaz Labs Studio, but as I only used the Simplify preset at 35%, I preferred doing the detail separately. * Topaz Labs Detail Micro Contrast Enhancement II preset.* Topaz Labs Simplify Line and Ink I preset at 35%.These filters were applied in the * Topaz Labs Studioapplication via Photoshop. (brush with pink color on an overlay layer.)Īs I mentioned above, the first round still felt a little dull to me, so on a merged layers copy, I applied two more Topaz Labs* filters.
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