Re: [softrock40] A useful trick
- Edward Gisske wrote:
> I was having a big problem with ground loops among my computer, stationThe other day on the FlexRadio reflector there was a discussion of
> ground, Softrock 40 and a MFJ switching power supply. This was evidenced by
> a whole lot of really nasty hash showing up on the output of the sound card.
> The spectrum display looked like a comb!
> The fix was to put a $14 Radio Shack dual isolation transformer in the sound
> card input lines. I was worried that the transformer might roll off at the
> ends of the spectrum, but it appears to be reasonably flat to 48 KHz. The
> phase/amplitude balance between the sections of the transformer seems to be
> acceptable as well, as the image rejection still seems fine.
transformers to buffer the audio, there was a mention of Jensen
transformers and I looked some of them up. 20H to 200KHz flat as a
pancake, wow, so was the price, over $150 each.
Mouser has some that are in that range for $15 each, not quite so low in
frequency response which is OK since it helps get rid of any 50/60Hz pickup.
"Sacred Cows make the best Hamburger!" Don Seglio Batuna