Hi all,

Im looking for a opamp for single supply (GND-12V), Dip8.
Can someone advise on a common op amp that works?

thanks

 

schematic

 

Hello,

It is better to know the application before selecting any op amp.
The LM358 for example, but the application may tell us that a better one is needed.
If it is just DC the LM358 should be ok though.

 

This thread, Which Op Amps Do You Use?, discusses numerous op amps people here have used, and what they're suited for (and not suited for). It might give you some ideas.

 

Why are you attenuating the signal by 1/2 and then amplifying it by 4?

 

Welcome to AAC!

Im looking for a opamp for single supply (GND-12V), Dip8.

All opamps can operate from a single supply. We need to know more about your application; in particular, frequency and input/output amplitude requirements.

Thanks for posting a schematic. Not doing that is a common newbie mistake.

 

Hello,

Have a look at the attached application note.

Bertus

 

Hi all,

Im looking for a opamp for single supply (GND-12V), Dip8.
Can someone advise on a common op amp that works?

thanks

There are many devices specifically for single rail - but it wasn't always that way.

Most people just arrange a 1/2 vcc reference voltage so AC could swing both ways.

The first ever op-amp was a couple of double triode tubes built into a module - it took the industry a while to get the hang of semiconductor like voltages. looking for rail to rail devices that work down to 5V is probably as good a place to start as any.

 

All opamps can operate from a single supply.

Very true statement.

But it probably should be qualified a bit: all op amps can be operated from a single supply, provided the circuit design ensures that its inputs will always lie within the op amp's specified input common-mode range, and provided the op amp's specified minimum output voltage swing is adequate for the application. Beginners sometimes (often?) forget to consider these limits, or aren't aware of them.

So-called "single supply" op amps are merely those which have features that make them easier to use in a single supply application. The LM358 (dual) and LM324 (quad), for example, have an input common-mode range that includes the V- supply voltage, and an output that can swing to within a few millivolts of the V- supply voltage. They can also operate at supply voltages as low as 3 volts, something that many older op amps, such as the ancient 741, cannot do.

"A man's got to know his op amp's limitations."
--Dirty Harry, Magnum Force (1973)

 

So-called "single supply" op amps are merely those which have features that make them easier to use in a single supply application.

Single supply opamps can also use split supplies, but the outputs have to be connected to the negative supply to minimize crossover distortion.

 

This thread, Which Op Amps Do You Use?

Did you ever get around to making the spreadsheet?

 

As long as you meet the minimum power supply specs almost any op amp can run off a single power supply.I used to do it all the time
Creating a Virtual Power Supply Ground
Wendy's Index

 

Did you ever get around to making the spreadsheet?

I made one a while back.

High Speed Op Amp Query

 

Did you ever get around to making the spreadsheet?

Yep. See here.

 

Yep. See here.

Thanks. I liked that post, so I must have downloaded the files. I just searched the previous thread you referenced.

 

Thanks. I liked that post, so I must have downloaded the files. I just searched the previous thread you referenced.

I made that list of op amps, but never got around to doing what I originally said I would do: write up a guide to op amp data sheet specifications, what they mean, and which ones to pay attention to when designing something. I made a list of the op amp parameters I intended to cover, but never got beyond input common-mode range; I probably should get off my hindquarters and finish it.

 

I probably should get off my hindquarters and finish it

I'm retired and I still put things off. I spent most of my life doing things to make others happy. Working mostly for myself now, I figure I've earned the right to do what I want to do; as much as possible.

 

I'm retired and I still put things off. I spent most of my life doing things to make others happy. Working mostly for myself now, I figure I've earned the right to do what I want to do; as much as possible.

Same situation here. I retired five years ago and have been enjoying life for a change: no more deadlines, no more schedules or having my work be in a project's "critical path," no more "objectives," no more progress reports, no more departmental budgets, no more clueless but demanding bosses and no more sub-par co-workers who don't pull their own weight.

Also, no more bloody commuting during rush hour. Bad weather? Let's see, got beer? Yup. Got TP? Yup. Got snackies? Yup. Got steaks, chops and fresh vegetables? Yup. Well, we're good to go, then. We'll just stay home.

Life is good. And it just keeps getting better...