alternative needed for LM7805 LM7809 LM79M09

rs_av_solutions · 18th January 2008, 01:59 PM

Hi there,

i am currently modding my soundcard.are there any better alternatives aviable for the follwoing parts :

LM7805 LM7809 LM79M09

Best regards and many thx in advance

Rainer

AndrewT · 18th January 2008, 02:12 PM

Hi,
yes.
But they are usually based on a miniature PCB with discrete components and are quite expensive.
The integrated 3pin regs are fairly similar and big improvements will be hard to find straight from the IC manufacturers.

sangram · 18th January 2008, 03:50 PM

Hi,

http://www.wenzel.com/documents/finesse.html

Try a similar circuit to shunt out noise from the 78xx series outputs, if you think it's needed.

Burr-brown has some REG series regulators that are fairly low noise and very low-drop, and so do Linear.

But you will require to build them up from the ground, the circuitry may be slightly different (the REG series are SO8, for example).

I'm not sure of any drop-in replacement for the 78xx series which will result in lower noise...

jackinnj · 18th January 2008, 04:16 PM

For a soundcard you are going to be working with surface mount components -- Linear introduced the LM3080 a few months ago -- this is a low noise, low dropout regulator which uses a single resistor and should certainly beat the LM7809 in the relevant terms. It is available in MSOP, SO223 and TO220, no such equivalent for the negative rail, however. They are available in samples from Linear, or from DK for ~ $2.50.

Check Linear's product tables -- I have been very pleased with their low noise regulators, but the best seem to be surface mount, like the LT1761, LT1964

And Sangram's citation of the Wenzel Associates article is a must read -- this knocks the noise down to the nanovolts.

rs_av_solutions · 19th January 2008, 09:56 AM

Hi,

my biggest problem is currently space is limited due the
currently big size of the soundcard already.

heres a picture of it (just put in those nichicons some hours before):

heres the schem of the dac :

pircture of the original card :

i am thinking about what to do next and if the change of the LM´s would be audible ?

18th January 2008, 01:59 PM	#1
rs_av_solutions diyAudio Member Join Date: Dec 2007	alternative needed for LM7805 LM7809 LM79M09 Hi there, i am currently modding my soundcard.are there any better alternatives aviable for the follwoing parts : LM7805 LM7809 LM79M09 Best regards and many thx in advance Rainer

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18th January 2008, 02:12 PM	#2
AndrewT diyAudio Member Join Date: Jul 2004 Location: Scottish Borders	Hi, yes. But they are usually based on a miniature PCB with discrete components and are quite expensive. The integrated 3pin regs are fairly similar and big improvements will be hard to find straight from the IC manufacturers.

18th January 2008, 03:50 PM	#3
sangram diyAudio Member Join Date: Sep 2002 Location: India	Hi, http://www.wenzel.com/documents/finesse.html Try a similar circuit to shunt out noise from the 78xx series outputs, if you think it's needed. Burr-brown has some REG series regulators that are fairly low noise and very low-drop, and so do Linear. But you will require to build them up from the ground, the circuitry may be slightly different (the REG series are SO8, for example). I'm not sure of any drop-in replacement for the 78xx series which will result in lower noise...

18th January 2008, 04:16 PM	#4
jackinnj diyAudio Member Join Date: Apr 2002 Location: Llanddewi Brefi, NJ	For a soundcard you are going to be working with surface mount components -- Linear introduced the LM3080 a few months ago -- this is a low noise, low dropout regulator which uses a single resistor and should certainly beat the LM7809 in the relevant terms. It is available in MSOP, SO223 and TO220, no such equivalent for the negative rail, however. They are available in samples from Linear, or from DK for ~ $2.50. Check Linear's product tables -- I have been very pleased with their low noise regulators, but the best seem to be surface mount, like the LT1761, LT1964 And Sangram's citation of the Wenzel Associates article is a must read -- this knocks the noise down to the nanovolts.

19th January 2008, 09:56 AM	#5
rs_av_solutions diyAudio Member Join Date: Dec 2007	Hi, my biggest problem is currently space is limited due the currently big size of the soundcard already. heres a picture of it (just put in those nichicons some hours before): heres the schem of the dac : pircture of the original card : i am thinking about what to do next and if the change of the LM´s would be audible ?