Why 7805 is better than LM1085?

[janneman]

Originally posted by SY
*OT WARNING*

Amarone ain't so cheap anymore. If you want a heart attack, check the prices for Quintarelli.

St-Emilion is Bordeaux. That's industrial stuff. There's more acreage just in St-Emilion under vine than Côte-Rôtie, Cornas, Hermitage, Vacqueyras, and Chateauneuf-du-Pape combined. Give me the small stuff any day. For $15 (in Europe), a Côte-Rôtie from Henri Gallet will hold its own just fine against the Spanish or Italian competition.

OK, OK, I give up! I'll try the Côte-Rôtie when I find it. What's your opinion on a St Estèphe? I like that one as well.

Jan Didden

[fdegrove]

Hi Jan,

What's your opinion on a St Estèphe?

It doesn't surprise me that you like the St Estephe.
Very fine wine indeed.
I can't measure it's performance as a regulator though.

Fred,

Nice avatar,I could dig out some more in case you need a change of clothes.


Cheerio,

[SY]

We just had an '89 Meyney during the football game this weekend. Very rough and tannic, but nice aromatics. And Cos is a classic, a wine I've repeatedly been able to nail in blind tastings. I like that kind of distinctiveness.

[Fred Dieckmann]

Try the wine.


You can rely on me,
Fred

[fdegrove]

Fred,

Who's that ugly guy?

Cheers,

[Jocko Homo]

Very good brand, sir, very good brand.

Jocko

[fdegrove]

On the menu,

Very good brand, sir, very good brand.

One bottle of:

Chateau Croix de Thomas

Saint-Georges-Saint Emilion

Built:1986

Sante!


Hi Jocko,

[Tube_Dude]

Nice souvenir!!!

The Stanley Kubrick's masterpiece!!!

Clockwork Orange!

Cheers

Jorge

[Elso Kwak]

Hi ,
After I discovered that the 7805 worked better sonically than the LM1086 for the TDA1543 I decided to explore this issue in more detail. The Jung like regulators sounded hopeless in this application.
I started with a simple emittor follower and TL431 and feedback from the output to the adjust pin of the TL431. I ended up with a triple Darlington connected transistor and no feedback at all from the regulated ouput. I deliberately choose a slow transistor ft 3MHz. The circuit is called a capacity multiplier in the book Low-Noise Electronic Design, C.D. Motchenbacher and F.C. Fitchen, Wiley & Sons.
The 2.2mH inductor (DC-resistance 30 Ohm) , the 2200µF cap and the main filter cap of the analog supply (four 11DQ10 Schottky diodes and 4700µF caps) form a PI-filter. The resistors around the TL431 are choosen to provide 5V output, actually it is 5.08V. The circuit shows absolutely no oscillation and sounds fine to me. It has of course poor load regulation but good line regulation.

[peranders]

Originally posted by jean-paul
...Faster semiconductors or whatever. I use ST 7805's ( made in Morocco ! )

Note: The chips aren't made in Morocco. They are only packaged there. Compare, Made in Brazil, Mexico, Singapore, Malaysia, China etc.