goood regulator

[sparkle]

Hi guys!

I have TL431 based power supply for my TDA1543 dac. Would like to make something better. Tried to trim down Sulzer regulator- it has got down to 7,88V. I need 7V . Could anyone tell me what to do please.
Also the opamp is NE5534 and the output transistor is 2n2905 and 2n1711 (one for positive and one for negative power supply- I would use only positive to supply my dac). I am using LM336-5V in Sulzer Borbelly configuration.
It seems that there are no schematic for that voltage so please, I need suggestions.....
regards
daniel

[peranders]

A Sulzer regulator works down to 0 volts if you choose the right parts, especially the opamp is important.

This regulator works down (or below?) 5 volts using OPA27.
http://www.diyaudio.com/forums/showt...607#post381607

The parameter you should look for is "common mode range". The common mode range must be a little below the voltage value you want. It's also important that the opamp can start with the inputs near ground. You can also you a kick start which I have in mine QSXPS regulator. My regulator can also be modified in order to produce 5 volts, even 3.3 V.

[sparkle]

How about that!

That's one massive home page- with lot's of goodies. Hey, another question. You have made a lot of headphone amplifiers- I have MBQuart QP450 Pro headphones - they need ultimate amplifier. What would You suggest.

Also, I would see the power supply that You have suggested and I'm looking forward to arrange something like 7V for my dac...

Thanks for the link- VERY nice looking equipment. Very nice.
I like it - clean and effective.
regards
daniel

[sparkle]

Originally posted by sparkle
How about that!

Hey, another question. You have made a lot of headphone amplifiers- I have MBQuart QP450 Pro headphones - they need ultimate amplifier. What would You suggest.

Also, I would see the power supply that You have suggested and I'm looking forward to arrange something like 7V for my dac...

Thanks for the link- VERY nice looking equipment. Very nice.
I like it - clean and effective.
regards
daniel

Oh, boy- I wonder what am I doing in my little town. Really nothing - something like that in diy - this is really good. Maybe when I grow up I would make something like those designs.


O.k., o.k. - I have forgot to tell You that I have soldered some SMD's and that my headphones are 300R.

Also I have quickly checked Your power supplies. Oh boy, when I saw the schematic. I start to shake like a milk shake.
I wanted a good power suply and I have got one.
I think I would like to build it for my dac - that is for sure but it is to much for now- to much money in fact- I would like to modify Sulzer that I allready have (schematic attached). If You would kind enough to tell me what to do and also what to do with Your power supplies to have at the end 7V and 5V for digital power supply I would be most happy
Yes, that power supply would be something I would like to build when I finish my other projects that I must finish (to much money going for that ones).

Sorry for long reply.....
daniel


Maybe to use LM336-2,5 refference and some other opamp instead of the ne 5534 - like opa27 you have suggested (if I can find it in croatia for a reasonable price).

[Fred Dieckmann]

"Oh boy, when I saw the schematic. I start to shake like a milk shake." - sparkle

How interesting ........ they have exactly the same effect on me!

[jwb]

In your schematic, you need to change ZD-1, R19, and R20 to get the desired output voltage.

[sparkle]

Originally posted by jwb
In your schematic, you need to change ZD-1, R19, and R20 to get the desired output voltage.

FRED - Yes- that is the feeling when You see great stuff and when You know it must wait because You want to make Your headphone amplifier - possibly jwb's aleph headphone, Your new tube preamplifier, and know that Your friend has made Aleph 5 clone and that it would be nice for You to make some Aleph X to compare them since You have only a small Onix preamp and amp. How the am I going to make way for that big and good regulator? By the way Mr. PerAnders has some more nice things on his site. Oh, boy......


JWB- I did substitute R19 and R20 (in fact the resistor devider in positive half) but leave LM336-5,0V. The lowest I could get was 7,88V. I don't know if the NE5534 would work on 7V correctly. I could replace LM336-5,0 with LM336-2,5 and try to turn it down further. Tomorrow I shall go and buy some LM3336-2,5 if my NE5534 would work correctly.
regards

[Fred Dieckmann]

"FRED - Yes- that is the feeling when You see great stuff" - sparkle

SOL - (Shaking out loud) It doesn't get much better than that......

I have to go lay down, all this shaking has left me breathless.

[grataku]

What up Fred? Baltimore? Uh?? Did you leave texas?
If you ever venture a little further north (NJ), stop by.
I'll buy you lunch.

[janneman]

Originally posted by sparkle




Oh, boy- I wonder what am I doing in my little town. Really nothing - something like that in diy - this is really good. Maybe when I grow up I would make something like those designs.


O.k., o.k. - I have forgot to tell You that I have soldered some SMD's and that my headphones are 300R.

Also I have quickly checked Your power supplies. Oh boy, when I saw the schematic. I start to shake like a milk shake.
I wanted a good power suply and I have got one.
I think I would like to build it for my dac - that is for sure but it is to much for now- to much money in fact- I would like to modify Sulzer that I allready have (schematic attached). If You would kind enough to tell me what to do and also what to do with Your power supplies to have at the end 7V and 5V for digital power supply I would be most happy
Yes, that power supply would be something I would like to build when I finish my other projects that I must finish (to much money going for that ones).

Sorry for long reply.....
daniel


Maybe to use LM336-2,5 refference and some other opamp instead of the ne 5534 - like opa27 you have suggested (if I can find it in croatia for a reasonable price).

If you put a resistor in parallel with C26 & C30, to lower the ref voltage, you can get easily at 7 V or lower, without any other changes. Just make sure tha opamp works with those voltages on its input and as supply voltages.

Calculate the attenuation of R22 and the R // with C26 so it becomes say 5 v, and make the feedback divider 1k and 2.5K, presto! 7Vdc.

Jan Didden