opamp swap

impsick · 20th February 2007, 01:12 AM

I hate to post a whole new thread for this but my searching has come up empty. i know there is all kinds if info online but none regarding my two choices at hand. maybe cause its not compatible, i dont know, so i ask diyaudio...

ok so i got this mic-pre with NE5534 opamps in it and i was wondering if i can put some AD744 in its place just to see the difference? is this possible?

thanks, Omar

gootee · 20th February 2007, 02:20 AM

I went to http://www.google.com and found the NE5534 datasheet "immediately":

http://www.onsemi.com/pub/Collateral/NE5534-D.PDF

And the AD744 datasheet is available from Analog Devices' website:

http://www.analog.com/UploadedFiles/...eets/AD744.pdf

You can right-click on the links and select "Save As", to save copies to your hard drive.

Good luck.

- Tom Gootee

http://www.fullnet.com/~tomg/index.html

-

impsick · 20th February 2007, 02:42 AM

ya, i have both data sheets, im just being lazy.

see the pins seem to be in the same spots im just confused on the whole balance and null thing. im a noob. but thanks man, i guess i'll try to be productive and pretend to understand all that data on the sheets. ha

god dang 20+ views and no "yes" or "no"? i know you all know the answer and are just laughing seeing how long you could drag this out before i snap.

there, i snapped.

Chucko · 20th February 2007, 09:10 PM

Op amp balance and null circuits are rarely used in audio. They are only useful if you are using DC coupling with no DC blocking capacitors.

IMHO, the AD744 would be a poor choice for a microphone preamp. It would probably work, but it would be noisy. Try a good low noise bipolar input device like the AD797, OPA227/228, LT1028, LT1128, or LT1115 instead.

impsick · 20th February 2007, 09:19 PM

nice! thanks for your reply, exactly what i needed to hear.

20th February 2007, 01:12 AM	#1
impsick diyAudio Member Join Date: Dec 2006	opamp swap I hate to post a whole new thread for this but my searching has come up empty. i know there is all kinds if info online but none regarding my two choices at hand. maybe cause its not compatible, i dont know, so i ask diyaudio... ok so i got this mic-pre with NE5534 opamps in it and i was wondering if i can put some AD744 in its place just to see the difference? is this possible? thanks, Omar __________________ "Nothing happens for a reason. There are just reasons why things happen." Quote me on that. http://stores.ebay.com/AudioGrade?_rdc=1

20th February 2007, 02:42 AM	#3
impsick diyAudio Member Join Date: Dec 2006	ya, i have both data sheets, im just being lazy. see the pins seem to be in the same spots im just confused on the whole balance and null thing. im a noob. but thanks man, i guess i'll try to be productive and pretend to understand all that data on the sheets. ha god dang 20+ views and no "yes" or "no"? i know you all know the answer and are just laughing seeing how long you could drag this out before i snap. there, i snapped. __________________ "Nothing happens for a reason. There are just reasons why things happen." Quote me on that. http://stores.ebay.com/AudioGrade?_rdc=1

20th February 2007, 09:19 PM	#5
impsick diyAudio Member Join Date: Dec 2006	nice! thanks for your reply, exactly what i needed to hear. __________________ "Nothing happens for a reason. There are just reasons why things happen." Quote me on that. http://stores.ebay.com/AudioGrade?_rdc=1

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20th February 2007, 02:20 AM	#2
gootee diyAudio Member Join Date: Nov 2006 Location: Indiana Blog Entries: 1	I went to http://www.google.com and found the NE5534 datasheet "immediately": http://www.onsemi.com/pub/Collateral/NE5534-D.PDF And the AD744 datasheet is available from Analog Devices' website: http://www.analog.com/UploadedFiles/...eets/AD744.pdf You can right-click on the links and select "Save As", to save copies to your hard drive. Good luck. - Tom Gootee http://www.fullnet.com/~tomg/index.html -

20th February 2007, 09:10 PM	#4
Chucko diyAudio Member Join Date: Jan 2002 Location: Silicon Valley, CA, USA	Op amp balance and null circuits are rarely used in audio. They are only useful if you are using DC coupling with no DC blocking capacitors. IMHO, the AD744 would be a poor choice for a microphone preamp. It would probably work, but it would be noisy. Try a good low noise bipolar input device like the AD797, OPA227/228, LT1028, LT1128, or LT1115 instead.

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