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Old 18th March 2011, 06:28 PM   #1
yakideo is offline yakideo  Poland
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Default LM833M

Hello,

I was wondering if anyone could tell me if the National LM833M (LM833 - Dual Audio Operational Amplifier) is capable of running off an single supply (12V). If not are they any other op-amps for single supply operation. The op-amp is to be used as an summer and buffer (eg. mono preout).
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Old 18th March 2011, 06:33 PM   #2
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like nearly all opamps, yes
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Old 18th March 2011, 06:35 PM   #3
yakideo is offline yakideo  Poland
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Quote:
Originally Posted by multisync View Post
like nearly all opamps, yes
I thought that most op-amps were made to run with dual supplies (eg. -15 and 15V)?
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Old 18th March 2011, 06:58 PM   #4
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yes, but what do you do when all you have is single supply? check this out

http://www.eng.yale.edu/ee-labs/morse/compo/sloa058.pdf
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Old 18th March 2011, 06:58 PM   #5
Mooly is offline Mooly  United Kingdom
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Quote:
Originally Posted by yakideo View Post
I thought that most op-amps were made to run with dual supplies (eg. -15 and 15V)?
Ground (zero volts) is just an arbitrary point... and as has been said, the LM833 is fine on a single rail.

Remember a -/+15 volt rail is a 30 volt supply as far as the opamp is concerned.
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Old 18th March 2011, 07:00 PM   #6
Mooly is offline Mooly  United Kingdom
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Quote:
Originally Posted by multisync View Post
yes, but what do you do when all you have is single supply? check this out

http://www.eng.yale.edu/ee-labs/morse/compo/sloa058.pdf
That's an excellent link if you so if you don't mind I'm going to copy that to another thread where someone else was asking similar questions.
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Old 18th March 2011, 07:24 PM   #7
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happy to help, google is our friend
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Old 18th March 2011, 07:30 PM   #8
yakideo is offline yakideo  Poland
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Quote:
Originally Posted by Mooly View Post
Ground (zero volts) is just an arbitrary point... and as has been said, the LM833 is fine on a single rail.

Remember a -/+15 volt rail is a 30 volt supply as far as the opamp is concerned.
Can I just connect ground to the + pin or do I need to create a virtual ground using a voltage divider?
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Old 19th March 2011, 07:04 AM   #9
Mooly is offline Mooly  United Kingdom
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Quote:
Originally Posted by yakideo View Post
Can I just connect ground to the + pin or do I need to create a virtual ground using a voltage divider?
Yes is the simple answer

If you post the circuit you have we could advise better on how to do it.
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Old 26th March 2011, 04:47 PM   #10
yakideo is offline yakideo  Poland
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Bellow is a preout I made. An inverted summing op-amp is obviously better (so I was told), also a inverted design doesn't strain the virtual ground current (the TLE2426 is 20mA max).

The question is, will having an inverted (read: out of phase) subwoofer signal be bad in a 2.1 setup?
Click the image to open in full size.
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