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Old 24th April 2012, 09:30 PM   #1901
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12V was probably too low.

RCORE shouldnt make too much difference at the low power of the B1. The rectifier / cap / regulator would make far more difference.
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Old 25th April 2012, 09:22 AM   #1902
AndrewT is offline AndrewT  Scotland
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12Vac may have been interfering with the performance of the shunt regulator.
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Old 25th April 2012, 11:41 AM   #1903
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Quote:
Originally Posted by KatieandDad View Post
12V was probably too low.

RCORE shouldnt make too much difference at the low power of the B1. The rectifier / cap / regulator would make far more difference.
I thought the advantage of an R-core is that they were quieter - are there other advantages?
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Old 25th April 2012, 02:08 PM   #1904
Salas is offline Salas  Greece
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Good for minimal magnetic field.
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Old 25th April 2012, 02:18 PM   #1905
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Quote:
Good for minimal magnetic field
Are they?

Have we seen comparative data?
Are there any experiments published or that we can repeat?

Quieter. I doubt it.
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Old 25th April 2012, 02:21 PM   #1906
Salas is offline Salas  Greece
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I have seen 20dB lower harmonic noise when exchanging a toroid with an R-Core in one box MC phonos. Basically its the only type it can live together in same box, save the little inaudible 50Hz you still get on FFT because of the AC wiring.
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Old 25th April 2012, 02:24 PM   #1907
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Have you posted your experimental details elsewhere?
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Old 25th April 2012, 02:25 PM   #1908
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Originally Posted by Salas View Post
I have seen 20dB lower harmonic noise when exchanging a toroid with an R-Core in one box MC phonos. Basically its the only type it can live together in same box, save the little inaudible 50Hz you still get on FFT because of the AC wiring.
Then otherwise a 100VA R-core and a 100VA toroid should be pretty indistinguishable in terms of sound? That's my impression.
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Old 25th April 2012, 02:31 PM   #1909
Salas is offline Salas  Greece
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Have you posted your experimental details elsewhere?
No, because I didn't think it was a particular finding since R-Core are primarily designed towards low field. Not having corners in their core shape and by carefully balancing the opposing bobbins. Some are a failure due to imprecision mind you. Have had Chinese with multiple secondaries running hot and noisy. The more windings the more difficult to fulfill the cancelling goals. ''R'' name comes from reminding the horse racing track shape by the way.
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Old 25th April 2012, 02:32 PM   #1910
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Originally Posted by Salas View Post
Good for minimal magnetic field.
Quote:
Originally Posted by Salas View Post
I have seen 20dB lower harmonic noise when exchanging a toroid with an R-Core ...............
Quote:
Originally Posted by schubert View Post
..............should be pretty indistinguishable in terms of sound? .............
If the second follows from the first, then surely there must be some audible benefit?
20dB (1/100th part) is a mighty big reduction in mains harmonics.
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