LM338 regulated snubberized PSU for audio amplifiers

[carlosfm]

Originally posted by XELB
Carlos, I that small store an 340VA-35V Toroidal transformer costs 40€ ( with instalation parts ).

I know that store for many years but I don't go there for long years...
If it's the place I'm thinking, it's in Av. Madrid, right?
Are they open on saturday mornings?

Interesting.
Is that 2x35V?
That's too high, but the price is not bad at all.
2x30V at 250~300VA is what I need now...

[XELB]

It's in Almirante Reis. When you go from Areeiro to Alameda you cross a small garden. The shop is "in" the garden.
You can park the car in the garden and ask there for the shop.
(they don't have any outdors)
They still have a lot of prices in escudos and old things in stock. That's why some have really good prices


I saw 35V because a friend (expert in HIFI) tested LM's chips really hot. He said that they play better hot


I'am also awaiting for two STK401-290 chips(2x50W each 6/3 Ohms).
This one's I will bridge.
In the papper they look great, thats why I wont to test them with 2Ohm and 6Ohm speakers.



If I make an external regulated 35/33V PSU, I can use it for the two amps

[carlosfm]

Originally posted by XELB
It's in Almirante Reis. When you go from Areeiro to Alameda you cross a small garden. The shop is "in" the garden.
You can park the car in the garden and ask there for the shop.
(they don't have any outdors)

Aaahhhh...
I know that guy since I was a kid.
Forgot his name...
My father went there very often to buy parts.

[XELB]

We call him "o Barbas"




What do you think of an LM3886 with an 35V transformer ?
This will give (35x1.41) almost 50V

[Bob03]

[IMG]D:\Audio&Electronic\Snubb. Reg. power supply Ver. 1.GIF[/IMG]
[IMG]D:\Audio&Electronic\Non-inverting ML3886 PA ver. 3.GIF[/IMG]

[Bob03]

PS: maby the moderators could replace the file on the first post?

[Bob03]

Summary

[XELB]

I have tried the unregulated snubberized PSU loud and clear at lunch time

Differences :
- more detail in high frequencies(guitars, voices, hithat, etc... all got better)
- Backing vocals and supporting instruments more detailed
- Bass seemed equal

( I have a little problem with bass, I am using an 125VA transformer as an test transformer speakers only wake up when I give some "gas")


What I most enjoyed was discovering new sound that this amp couldn't reach.
I was listening and I was saying to my self, this instrument was not here…. Heheheh


Now a look forward to try the regulated

[carlosfm]

Well... I think a resistor and a cap must be one of the most cheap and effective tweaks ever.

Much better than speaker cable lifters and gold-plated volume knobs.

[Mikett]

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