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
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
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/showthread.php?postid=381607#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.
This regulator works down (or below?) 5 volts using OPA27.
http://www.diyaudio.com/forums/showthread.php?postid=381607#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.
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 
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 said: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).🙁
Attachments
Lattice of coincidence..........
"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!
"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 said:
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
Shaking till tears come to my eyes.
"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.
"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.
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. 😀 🙂 😎
If you ever venture a little further north (NJ), stop by.
I'll buy you lunch. 😀 🙂 😎
sparkle said:
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
"What up Fred? Baltimore? Uh?? Did you leave texas?"
John Waters (Fred's avatar) is from Baltimore.
John Waters (Fred's avatar) is from Baltimore.
Baltimore
Is that who that is! I had no idea............... I just picked it because I liked the mustache. Isn't he one of the ones being considered for John Kerry's running mate for the V.P.
Is that who that is! I had no idea............... I just picked it because I liked the mustache. Isn't he one of the ones being considered for John Kerry's running mate for the V.P.
You can put OP27 instead NE5534, works verry good in my 8,5V Walt Jung SupeRegulator for TDA1543 dac.
Mr. Jan - I must correct the previous mail
R15,16 14.0k 1%
R17,18 1.0 k 1%
R19,25 6.19k 1%
R20,24 3.01k 1%
R21,27 47.5 ohm
R22,26 47.5k 1%
R23,28 6.19k 1%
C15,16 4700uF 35V
C17,18 . . .1uF 50V
C19-20. .100uF 35V
C21,22 4700uF 35V
C23,24 . . .1uF 50V
C25,28 . 4.7uF 50V
C26,30 . .1uF 50V
C27,31. .100uF 35V
C28,32 . . .1uF 50V
D1-8 . . 1N4002
Q1 . . . 2N2905
Q2 . . . 2N1711
REG-1 LM-317
REG-2 LM-337
U1, 2 . . NE5534
ZD1,2 LM-336-5V
These are the original values.
The attenuation of R22 is not very much because it is R22=47k5.
I have modified the original circuit like this (trying to get to the 7V output); changed R19=3k, for R20 put 5k trimmer. Trimmed it until the voltage stop rissing. Estimated voltage was 7,88V. SoI have thought to put 100k in paralel with C26 to lower the voltage of the refference. The output voltage was around 0,5V. That was done the day before yesterday.
So I must have been doing something wrong. ZD1 and 2 are still LM336-5V. I will try to find some LM336-2,5V and connect them later today. Hope this would help (without the resistor in paralel with C26) if the opamp is working with that voltages (NE5534) which I doubt.
regards
daniel
I think that OP27 is little noisier than NE5534. Can anybody tell me if NE5534 would work on 7V supply?
R15,16 14.0k 1%
R17,18 1.0 k 1%
R19,25 6.19k 1%
R20,24 3.01k 1%
R21,27 47.5 ohm
R22,26 47.5k 1%
R23,28 6.19k 1%
C15,16 4700uF 35V
C17,18 . . .1uF 50V
C19-20. .100uF 35V
C21,22 4700uF 35V
C23,24 . . .1uF 50V
C25,28 . 4.7uF 50V
C26,30 . .1uF 50V
C27,31. .100uF 35V
C28,32 . . .1uF 50V
D1-8 . . 1N4002
Q1 . . . 2N2905
Q2 . . . 2N1711
REG-1 LM-317
REG-2 LM-337
U1, 2 . . NE5534
ZD1,2 LM-336-5V
These are the original values.
The attenuation of R22 is not very much because it is R22=47k5.
I have modified the original circuit like this (trying to get to the 7V output); changed R19=3k, for R20 put 5k trimmer. Trimmed it until the voltage stop rissing. Estimated voltage was 7,88V. SoI have thought to put 100k in paralel with C26 to lower the voltage of the refference. The output voltage was around 0,5V. That was done the day before yesterday.
So I must have been doing something wrong. ZD1 and 2 are still LM336-5V. I will try to find some LM336-2,5V and connect them later today. Hope this would help (without the resistor in paralel with C26) if the opamp is working with that voltages (NE5534) which I doubt.
regards
daniel
aparatusonitus said:
I think that OP27 is little noisier than NE5534. Can anybody tell me if NE5534 would work on 7V supply?
Don't try to do too many things at the same time - I would be lost too! In the situation where you have 7.88 VDC, can you lower the reference by putting a resistor // C26 so you get 7VDC? If that's OK, start worrying about the right opamp.
Jan Didden
Jan Didden
janneman said:
O.K. - will try it and let know. Thanks
regards
daniel
edit:
I have tried to put 100k across C26 and my output voltage dropped to 0,5V or so. Would try to put something bigger in that place. What I can do also is to put LM336- 2,5V refference. That I will do today also and let know.
Hi!
I have changed LM336-5 (5V reference) with LM336-25 (2,5V reference). With trimmer in place of the resistor going to ground in voltage divider I have trimmed the value of the output voltage to 7V and it is working o.k. I must correct few things (specially to lower the output voltage of LM317/337)and it would be it.
regards
daniel😀 😀
I have changed LM336-5 (5V reference) with LM336-25 (2,5V reference). With trimmer in place of the resistor going to ground in voltage divider I have trimmed the value of the output voltage to 7V and it is working o.k. I must correct few things (specially to lower the output voltage of LM317/337)and it would be it.
regards
daniel😀 😀
sparkle said:Hi!
I have changed LM336-5 (5V reference) with LM336-25 (2,5V reference). With trimmer in place of the resistor going to ground in voltage divider I have trimmed the value of the output voltage to 7V and it is working o.k. I must correct few things (specially to lower the output voltage of LM317/337)and it would be it.
regards
daniel😀 😀
Good job!
Jan Didden
- Status
- Not open for further replies.