Dear Al : Why it is better to use transformers with lower turns ratios ?

Tweakers' Asylum

Tweaks for systems, rooms and Do It Yourself (DIY) help. FAQ.

Dear Al,

I had made two transformers for AC line noise filtering :

> One is a new 300VA EI transformer with a secondary of 6VAC X 2. I use the full 12VAC for the secondary voltage. A 0.33 Ohm resistor + multiple caps of total value of 90uF is connected across the secondary

> The other is an old 100VA EI transformer with a secondary of 18VAC X 2. I only use 18VAC for the secondary voltage. A 0.30 Ohm resistor + a 0.50 Ohm resistor + multiple caps of total value of 90uF is connected across the secondary

I noticed improvement in the resolution, bass and treble after adding the first transformer. More improvement was found after adding the second one

I would to ask the followings:

1. You mentioned that 'It is better to use transformers with lower turns ratios'. What is the reason behind ?

2. If you use a 14VAC secondary for a 120VAC primary, does it mean that I should use 24VAC or even 36VAC secondary if my primary is 220VAC ?

3. Also the temperature of my 300VA transformer is around 10 degree Celsius above the room temperature after switched on for one hour. Is this normal ?

4. Would it be better if connect one resistor for each small cap in the secondary of the transformer ?

Sorry for asking so much questions to you. But I like to learn more from you.

Thanks.

This post is made possible by the generous support of people like you and our sponsors:

Follow Ups Full Thread

Topic - Hammond 193L choke tweak for AC - wheezer 10:08:29 07/02/07 (11)

V = L (dI/dt) - Al Sekela 10:36:17 07/02/07 (10)

RE: V = L (dI/dt) - wheezer 11:12:13 07/02/07 (9)

Agree, a 3KV or higher cap would be better. - Al Sekela 10:50:07 07/03/07 (8)

RE: Agree, a 3KV or higher cap would be better. - wheezer 11:08:01 07/03/07 (7)

Transformers offer some filtering, but not as much as chokes. - Al Sekela 14:22:41 07/03/07 (6)

Dear Al : Why it is better to use transformers with lower turns ratios ? - diyaudiophile 01:24:14 07/10/07 (0)

RE: Transformers offer some filtering, but not as much as chokes. - wheezer 20:52:21 07/03/07 (4)

Experiment with all your power circuits. - Al Sekela 12:32:24 07/04/07 (0)

RE: Transformers offer some filtering, but not as much as chokes. - bartc 06:38:50 07/04/07 (2)

RE: Transformers offer some filtering, but not as much as chokes. - wheezer 07:00:01 07/04/07 (1)

RE: Transformers offer some filtering, but not as much as chokes. - bartc 06:24:20 07/05/07 (0)

Follow Ups

Dear Al : Why it is better to use transformers with lower turns ratios ? - diyaudiophile 01:24:14 07/10/07 (0)

Post a Message!