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RE: Also, how do you determine what mA rating to use?

Hammond chokes (the clamp-mount ones) have the advantage of being cheap and readily available . The inductance tends to fall off as current increases . DCR also seems high and the cores are nothing special . The same applies to Triad . I have used both Hammond and Triad , both get the job done . You get what you pay for . I don't know what the more pricey Hammonds are like but the cores are still standard lams by the looks of things . I now get my chokes custom built in batches of at least 10 with M6 lams and over-rate by about 50% over modelled peak current . I would recommend inmates here doing the same and splitting a batch in a group buy .

Al


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