Which dual Op-Amps run well on 9v?

[clubsprint]

Which dual Op-Amps run well on 9v?

I'm just building a tone control and the circuit specifies NE5534 and TL072 which require +/-15v. What other opamps could I use instead that will give me the same tonal quality with a 9v supply? Or at least close.

[PerroGrande]

Both op-amps you listed will operate at 9V.  They won't has as much headroom with a lower supply voltage, but they will operate properly.

[clubsprint]

Excellent. Thanks

[petemoore]

 MAX1044 converter could be used to nearly double the voltage.

[brett]

Hi
are you aware that you can supply the input signal with 4.5V of DC on it, and power the op-amp with 0 and 9V (instead of + and - voltages)??
Have a look at something like the MXR distortion + for how this works.
Even simpler is to use the LM358, which does this internally, so that "single sided" supplies can be used.  It's a wonder that it isn't more popular.  Maybe soimeone can tell me why?  (Except that most circuits are already designed for op-amps that need dual supplies, and so there is a lot of "intertia" out there)
cheers

[petemoore]

Even simpler is to use the LM358, which does this internally, so that "single sided" supplies can be used.
  Hard to think of any other reasons that this chip wouldn't be the way to go.

[zyxwyvu]

Hi
are you aware that you can supply the input signal with 4.5V of DC on it, and power the op-amp with 0 and 9V (instead of + and - voltages)??
Have a look at something like the MXR distortion + for how this works.
Even simpler is to use the LM358, which does this internally, so that "single sided" supplies can be used.  It's a wonder that it isn't more popular.  Maybe soimeone can tell me why?  (Except that most circuits are already designed for op-amps that need dual supplies, and so there is a lot of "intertia" out there)
cheers

You still need to bias the inputs to 4.5V with an LM358. The difference between it (along with similar single-supply opamps) and regular opamps is that the LM358 can tolerate input voltages all the way down to ground. This doesn't mean it can handle voltages below ground, as with an ac signal biased to ground. I suspect you would get some pretty nasty distortion is used with a ground-biased signal. Of course, with a standard opamp I wouldn't expect any output at all in such a situation. If you take a look at the datasheet, you can see this under "Input Common-Mode Voltage Range", which is listed as 0 to (V+ - 1.5) volts for the LM358.

[earthtonesaudio]

Yep.  The main difference with the LM358 in AC applications is the output peak to peak voltage swing is much larger.

[gez]

Perhaps Brett was thinking of the LM386?  The reason why they aren't so popular for projects is the tick-over current (up to 8mA Max) and they're singles.

I use LM358 amps a lot.  Cheap and versatile.  My favourite amp is the ICL7621 (mouser sell them in the US).  CMOS amps.  Large swings at input and output, plus micro-power.

[brett]

Hi
I hadn't thought of this too much before.  I HAVE used the LM358 with 0 and 9V and NOT biased the input.  I think it had a source-follower buffer in front.  I can only guess that my guitar output wasn't high enough to get clipped too badly.

I had (naively) believed this was a straightforward thing to do.  I probably read the information below in a datasheet and got a bit carried away.  My favourite application was in a balanced modulator, which sounds so crazy that I probably didn't notice the distortion.

The LM158 series are op amps which operate with only a single power supply voltage, have true-differential inputs, and remain in the linear mode with an input common-mode voltage of 0 VDC.

cheers

[zyxwyvu]

Hi
I hadn't thought of this too much before.  I HAVE used the LM358 with 0 and 9V and NOT biased the input.  I think it had a source-follower buffer in front.  I can only guess that my guitar output wasn't high enough to get clipped too badly.

Actually this should work fine, as you found. A JFET source follower dc coupled to the input of an LM358 should add a dc offset of about a volt, so a guitar signal could probably get through without clipping. Without the buffer, though, I expect it would have clipped quite a bit.