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In Reply to: In a grounded metal chassis, no shielding is needed for TWISTED pair. posted by cheap-Jack on April 28, 2007 at 11:53:39:
The way I understand it, twisting a ground wire around a signal wire results in very little shielding. Now if you try it and find that it produces some subjective benefit in some particular application, that's OK with me, but I would not expect twisting ground and signal wires to result in any significant reduction in noise/hum pickup.As I have said here before, twisted pairs are of great benefit in a balanced system feeding a differential input. A simple input transformer constitutes a differential input provided neither end of the primary is grounded.
-- Dave
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Follow Ups
- Re: In a grounded metal chassis, no shielding is needed for TWISTED pair. - Dave Cigna 18:04:13 04/28/07 (46)
- Re: In a grounded metal chassis, no shielding is needed for TWISTED pair. - kurt s 22:58:09 04/30/07 (24)
- The point of confusion is.... - Russ57 08:19:46 05/02/07 (3)
- So who brings in the confusion in the first place? - cheap-Jack 08:50:29 05/02/07 (2)
- Why is it always you? - Russ57 10:35:39 05/02/07 (1)
- Why is it always YOU get so personal? - cheap-Jack 11:48:16 05/02/07 (0)
- No, No, No... - Triode_Kingdom 21:28:55 05/01/07 (12)
- Re: No, No, No... - kurt s 22:36:56 05/01/07 (11)
- Re: No, No, No... - Triode_Kingdom 23:41:41 05/01/07 (9)
- Re: No, No, No... - kurt s 09:20:31 05/02/07 (0)
- Re: No, No, No... - . 04:53:54 05/02/07 (7)
- Are you sure? No-name . !!! - cheap-Jack 08:10:05 05/02/07 (6)
- Re: Are you sure? No-name . !!! - . 08:48:44 05/02/07 (5)
- Yes, your mouth is full of "nonense" !!! - cheap-Jack 09:10:39 05/02/07 (4)
- 'Yes, your mouth is full of "nonense" !!!' is poor use of the English language (nt) - . 10:09:38 05/02/07 (0)
- oh dear - . 10:08:48 05/02/07 (2)
- Stop show off your codes in "an audio forum", bud. - cheap-Jack 12:11:41 05/02/07 (1)
- Ipods - . 12:32:28 05/04/07 (0)
- PS - kurt s 22:40:36 05/01/07 (0)
- I disagree - Dave Cigna 15:31:51 05/01/07 (4)
- Me Too... - Triode_Kingdom 22:25:36 05/01/07 (3)
- What "signal current" would it be flowing thru the CT? (nt) - cheap-Jack 07:37:01 05/02/07 (1)
- Re: What "signal current" would it be flowing thru the CT? (nt) - Triode_Kingdom 12:23:52 05/02/07 (0)
- Re: Me Too... - kurt s 22:33:51 05/01/07 (0)
- Yes, balanced transfer must have a centre-tap ground reference.. - cheap-Jack 12:57:21 05/01/07 (0)
- Me too, only short twisted pair for my MM cartridge - no shield. - cheap-Jack 12:34:08 05/01/07 (0)
- Twisted pair works bigtime in 'unbalanced' signal transfer. (long) - cheap-Jack 09:08:12 04/30/07 (17)
- a big sigh from me too - Dave Cigna 13:34:00 04/30/07 (14)
- I'll buy the beer - Russ57 15:27:02 05/01/07 (3)
- I'll buy the second round! - Dave Cigna 15:53:24 05/01/07 (2)
- OK, that's too deep - Russ57 16:52:47 05/01/07 (1)
- Re: OK, that's too deep - Dave Cigna 15:28:09 05/02/07 (0)
- Another orange vs apple talk again !! - cheap-Jack 11:40:02 05/01/07 (9)
- another sigh - Dave Cigna 15:11:34 05/01/07 (8)
- Why?? - cheap-Jack 16:19:50 05/01/07 (7)
- OK - Dave Cigna 15:20:33 05/02/07 (0)
- Re: Why?? - . 05:04:36 05/02/07 (5)
- What's making noises here? Some spirits without a name? (nt) - cheap-Jack 07:29:44 05/02/07 (4)
- it depends - . 07:57:27 05/02/07 (3)
- Some insane wantd to wage a war here !!!` - cheap-Jack 08:29:20 05/02/07 (2)
- ni hao - Triode_Kingdom 08:04:42 05/03/07 (0)
- good grief !!! - . 09:07:38 05/02/07 (0)
- Sigh - Russ57 10:35:47 04/30/07 (1)
- Are we talking about shielding in audio amp or video? - cheap-Jack 10:51:50 04/30/07 (0)
- OK - So what would you recommend I do? nt - Cut-Throat 07:56:22 04/29/07 (2)
- Re: OK - So what would you recommend I do? nt - Dave Cigna 16:42:22 04/29/07 (1)
- Thanks! nt - Cut-Throat 04:39:23 04/30/07 (0)
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