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1. [Amps] Limits of a Power transformer (score: 1): Author: "Nat Gurumoorthy" <ngurumoorthy@ubicom.com>; Date: Tue, 1 Aug 2006 18:21:52 -0700; Hi, I am in the process of scrounging together parts for a linear amp. I have a pair of GI-7BT. I have acquired a Triad P-14A (115 primary, 1780V 250ma CCS secondary) Weighs about 14lbs. Secondary re; /archives//html/Amps/2006-08/msg00025.html (7,087 bytes)
2. Re: [Amps] Limits of a Power transformer (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Wed, 02 Aug 2006 07:45:04 +0100; There's a useful tool at http://www.duncanamps.com/psud2/index.html Plug in your values and get predictions of what your PSU will do in practice (accurate predictions in my experience). Run with zero; /archives//html/Amps/2006-08/msg00031.html (8,201 bytes)
3. Re: [Amps] Limits of a Power transformer (score: 1): Author: "Tom W8JI" <w8ji@w8ji.com>; Date: Wed, 2 Aug 2006 04:56:03 -0400; I think you'll find a 160 ohm ESR transformer has horrible regulation. The hypersil in the AL12 series for example has about 10 ohms of secondary resistance. The AL-811 around 20 ohms ESR. With 160; /archives//html/Amps/2006-08/msg00035.html (7,695 bytes)
4. Re: [Amps] Limits of a Power transformer (score: 1): Author: Ian White GM3SEK <gm3sek@ifwtech.co.uk>; Date: Wed, 2 Aug 2006 10:50:41 +0100; Don't forget the effect of primary resistance. It may seem low (often so low that it's difficult to measure accurately) but the value has to be multiplied by (turns ratio)-squared, and then added to; /archives//html/Amps/2006-08/msg00038.html (8,966 bytes)
5. Re: [Amps] Limits of a Power transformer (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Wed, 02 Aug 2006 11:07:55 +0100; If you use the PSU simulater, don't forget to use the total 'effective Rs', not just the secondary resistance, with the secondary rms current to get the dissipation in the transformer. In this case,; /archives//html/Amps/2006-08/msg00040.html (8,254 bytes)
6. Re: [Amps] Limits of a Power transformer (score: 1): Author: "Tom W8JI" <w8ji@w8ji.com>; Date: Wed, 2 Aug 2006 06:53:25 -0400; I should have been clearer. Of course the ERS is a combination of losses that are the effective resistance. We can be sure the actual ESR is always higher than the dc secondary resistance. 73 Tom __; /archives//html/Amps/2006-08/msg00042.html (7,917 bytes)
7. Re: [Amps] Limits of a Power transformer (score: 1): Author: "Will Matney" <craxd1@verizon.net>; Date: Wed, 02 Aug 2006 22:54:39 -0400; Generally, the power supply formula to find out the final DC current the supply is capable of is to multiply the AC rms current by 0.62 or Iac x 0.62 for a full wave bridge. That would give 0.25 x 0.; /archives//html/Amps/2006-08/msg00065.html (9,565 bytes)
8. Re: [Amps] Limits of a Power transformer (score: 1): Author: "Tom W8JI" <w8ji@w8ji.com>; Date: Thu, 3 Aug 2006 06:13:29 -0400; I think you are using the approximation where a full wave rectifier center tapped transformer is used in a bridge. You would How do you get 155mA at no load? With load The figure you always use is w; /archives//html/Amps/2006-08/msg00080.html (8,692 bytes)

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