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Old 14th September 2012, 02:39 PM   #7331
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Wow, that is a much better price then at Mouser. Thanks, Holger.
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Old 14th September 2012, 03:28 PM   #7332
pdul is offline pdul  Denmark
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I am surprised, that nobody has talked about making the listening room into a Faraday cage to complete the rf filtering
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Old 14th September 2012, 03:46 PM   #7333
pdul is offline pdul  Denmark
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I have this trafo 230v to 230v 1200va. Will it make any difference to run the mains thru that one, regarding rf.?
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Old 14th September 2012, 03:54 PM   #7334
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Depends on the transformer.
A normal transformer has reasonable capacitive coupling between primary and secondary windings, which is a pleasant path for high frequencies.
The bigger the transformer, the higher the capacitance, the bigger the problem.
There are transformers with a static shield, which will help with this.
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Old 14th September 2012, 04:08 PM   #7335
pdul is offline pdul  Denmark
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It was not made for hifi, it was used for isolated control voltage in a big crane So its probably not so good except for damping of spikes.
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Old 14th September 2012, 04:23 PM   #7336
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Maybe one time i will make actual measurements on transformers to find out how wide band different makes are.
i have a little time today .....
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Old 14th September 2012, 04:39 PM   #7337
pdul is offline pdul  Denmark
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With isolated net, you have zero potential to ground. Is it wrong to asume that it aplies to rf and other polutions in the supply too?
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Old 14th September 2012, 05:44 PM   #7338
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Yes. It is wrong .
A transformer generally solves the galvanic part of the isolation, but capacitive coupling is another story.
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Old 17th September 2012, 06:35 PM   #7339
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I have a lot of BC337-40 with Hfe of 400 - 450 with no matching PNP.
When somebody here has too much BC327-40 with Hfe 400 - 450 i would like to buy or trade 200 pc.
I hope this deal is not big enough to put into vendors bazar.
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Old 17th September 2012, 07:00 PM   #7340
pdul is offline pdul  Denmark
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Same problem here 327 hfe 300-390 and 337 460-590 all Unfairchild.
The Diotec´s has much better/more matches.
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