The simplistic Salas low voltage shunt regulator

[RCruz]

Originally Posted by orelli

also paralleling two secondaries help the sound (of the same voltage, of course)

That way you double power output so you get double VA

[orelli]

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.

[nicoch58]

Originally Posted by orelli

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 ?

[Salas]

Watch the loop area of the before reg cabling to be tight too.

[orelli]

@ 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?

[AndrewT]

What's the loop area?

twist cable pairs to minimise loop area and balance radiation influence.

[orelli]

Thanks Andrew.

[AndrewT]

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.

[orelli]

Very clear.

[Kazuo Ozawa]

Originally Posted by Salas

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