LM833M

yakideo · 18th March 2011, 06:28 PM

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).

multisync · 18th March 2011, 06:33 PM

like nearly all opamps, yes

yakideo · 18th March 2011, 06:35 PM

Quote:

Originally Posted by multisync

like nearly all opamps, yes

I thought that most op-amps were made to run with dual supplies (eg. -15 and 15V)?

multisync · 18th March 2011, 06:58 PM

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

Mooly · 18th March 2011, 06:58 PM

Quote:

Originally Posted by yakideo

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.

Mooly · 18th March 2011, 07:00 PM

Quote:

Originally Posted by multisync

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.

multisync · 18th March 2011, 07:24 PM

happy to help, google is our friend

yakideo · 18th March 2011, 07:30 PM

Quote:

Originally Posted by Mooly

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?

Mooly · 19th March 2011, 07:04 AM

Quote:

Originally Posted by yakideo

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.

yakideo · 26th March 2011, 04:47 PM

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?

18th March 2011, 06:28 PM	#1
yakideo diyAudio Member Join Date: May 2010	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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18th March 2011, 06:33 PM	#2
multisync diyAudio Member Join Date: Jan 2008 Location: Carp	like nearly all opamps, yes

18th March 2011, 06:58 PM	#4
multisync diyAudio Member Join Date: Jan 2008 Location: Carp	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

18th March 2011, 07:24 PM	#7
multisync diyAudio Member Join Date: Jan 2008 Location: Carp	happy to help, google is our friend

26th March 2011, 04:47 PM	#10
yakideo diyAudio Member Join Date: May 2010	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?

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