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Old 26th October 2012, 07:24 PM   #5511
RCruz is offline RCruz  Switzerland
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Quote:
Originally Posted by orelli View Post
also paralleling two secondaries help the sound (of the same voltage, of course)
That way you double power output so you get double VA
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Old 27th October 2012, 08:16 AM   #5512
orelli is offline orelli  Italy
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Of course. I'm very agree with you an Pietjers; big txs are more important than big capacitance. My very personal theory about big txs, is that big VA have little resistance and
lower impedance. Like in the shunt reg, lower is the out impedance, better is.
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Old 27th October 2012, 08:18 AM   #5513
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Quote:
Originally Posted by orelli View Post
Of course. I'm very agree with you an Pietjers; big txs are more important than big capacitance. My very personal theory about big txs, is that big VA have little resistance and
lower impedance. Like in the shunt reg, lower is the out impedance, better is.
is a fact

come sta' il Liga ?
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Old 27th October 2012, 08:18 AM   #5514
Salas is online now Salas  Greece
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Watch the loop area of the before reg cabling to be tight too.
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Old 27th October 2012, 09:21 AM   #5515
orelli is offline orelli  Italy
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@ nicoch.Sta una meraviglia . I listened his studio monitor and I made the RPG like diffusors for him.
@ Salas. Sorry , I don't understood.What's the loop area? Do you intend the cabling between tx,diodes bridges and filtering caps?
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Old 27th October 2012, 10:14 AM   #5516
AndrewT is offline AndrewT  Scotland
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Quote:
What's the loop area?
twist cable pairs to minimise loop area and balance radiation influence.
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Old 27th October 2012, 10:34 AM   #5517
orelli is offline orelli  Italy
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Thanks Andrew.
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Old 27th October 2012, 01:03 PM   #5518
AndrewT is offline AndrewT  Scotland
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As a follow up:
Electricity can only flow in circuits. What goes out, MUST come back in.

In our circuits there is always a return route for a flow route.
Those flow and return make up a pair. That is the pair that should be low loop area.
It applies to mains cables. It applies to LV AC supplies from a transformer. It applies to LV DC supplies from rectifiers. It applies to signals, whether single ended or balanced. It applies to every circuit where electric current flows.
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Old 28th October 2012, 10:37 AM   #5519
orelli is offline orelli  Italy
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Very clear.
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Old 30th October 2012, 06:51 AM   #5520
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Default Zobel of Reflektor +3.3V

Quote:
Originally Posted by Salas View Post
1R 0.47u is quite different to listen to for instance. If stable on the scope as the other, you can see where it goes, if there is something to gain or lose in lower values or to stay where it was. Like a recognition shot.
After long journey I reached the goal to serch for Zobel of Reflektor +3.3V.
The story is following.(Of course no oscillation on all cases)

1) 2R2+2.2uF
Not bad, no harsh, but sound dim.

2) 2R2+0.22uF
Become brilliant, but harsh.

3) 0R47+0.22uF
Become decent, but still a little harsh.

4) 0R47+0.44uF(0.22u//0.22u)
Become great deep sound, no more harsh.
I also guess that it is very good for 1R0+0.47u as Salas recommends.

On this experiment I found a few principles about Zobel.
1 Zobel is strongly related to quality of sound.
2 If Zobel is not been optimized, sound become harsh or dim.
3 The optimal value is between the narrower area than I expected.

Next step, I build Reflektor +1.2V. If I get good result, will report.

Best regard
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