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Old 20th August 2012, 08:17 PM   #1
bmoraru is offline bmoraru  Romania
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Default BA033 replacement?

would like to replace such a 3.3V regulator in a Denon CD player (DAC analog voltage, i assume) if i could find a better one - can you recommend one? any recommendations? thanks!
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Old 21st August 2012, 07:47 PM   #2
Mooly is offline Mooly  United Kingdom
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Know your enemy

What aspect of the regulator do you feel needs improving. I'm guessing the reg is already itself fed from a stabilised supply which would ensure a very very stable output. I doubt you will gain much and could easily make things worse by just swapping for the sake of it. These regs also have a low in out differential (if that is important to the application).

If you can measure and identify a performance aspect that needs improvement then that's fine and perhaps a custom discrete design may be the answer.

It is easy to make things worse though. You might get more real benifit by looking at improving local decoupling at the destination end of the reg as even a few cm of print can easily increase the noise observed at that point with respect to the reg.
Installing and using LTspice IV. From beginner to advanced.
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Old 21st August 2012, 09:00 PM   #3
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LF33AB is a good one with specified noise numbers (50 V). I never found a data sheet of BA033 with noise numbers which is very odd for a regulator data sheet. I suspect it to be high. Anyway I used LF33AB with good results in some DACs. There are better 3.3 V regs but those are SMD only. If current is very low you could try the excellent FleaDIY from Ray. In any case good local decoupling of the chips in the vicinity of the + and GND pins is advisable.

BTW it is wise not to assume things in electronics. I agree with Mooly but give some info anyway. Better make sure what it is you will be replacing and what impact it may have. A service manual/schematic is a must to know what you are doing.
It's only audio. Member of the non modular PCB design committee

Last edited by jean-paul; 21st August 2012 at 09:06 PM.
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Old 22nd August 2012, 10:39 AM   #4
6h5c is offline 6h5c  Netherlands
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Hi JP,

In fact, i'm looking for a 3-pin replacement for the BA033FP, which is the SMD version. I've got my eye on the LT1963A from Linear. Do you have any experience with them or are there some other SMD types you can recommend?

Thanks for your kind words about The Flea :-)


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The new DOS-CFP board is out!

Last edited by 6h5c; 22nd August 2012 at 10:44 AM.
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