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Mouser doesn’t sell National Semi op amps. Beyond that it mostly comes down to the specs and here are the highlights: It depends on the thermal characteristics of the op amp used. This results in an increased phase margin, improved stability, and improved transient response.
Anonymous July 29, at 7: The distortion drops as the harmonics fall above this frequency. I did lots of tests with different samples of the and different value resistors to arrive at the optimal 1 ohm value.
But I checked for that where applicable. Most of the other low power parts I tested were much worse:. The only theory I’ve datzsheet to explain this is that the metal can package rejects RFI better. If you include the out of band stuff, the entire noise floor rises and masks the true audio performance below 20 Khz.
Vout a9 xfmr spice llc converter spice model Text: If you’re using say a video buffer op amp in an audio application, or using a load impedance lower than recommended, you need to test for thermal modulation. This article is all about measuring the results and putting some facts around the differences between op amps in a typical audio application.
Even if you use the much more stringent —80 dB threshold of 0. Have you considered testing several of the same op amp to see production irregularities?
It also has very high distortion into 32 ohms–especially at high frequencies–although at least some of that is the OPA “third channel”. This can be hard to figure out from many datasheets.
The higher the gain the more it can matter. The measurement is at the headphone output into ohms at full volume.
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Anticipating the probably upcoming O2DAC There are op amps with better DC specs, faster settling times, higher slew rates, lower offsets, etc. The older TL, despite being used in thousands of audio devices, is way out of its league against newer op amps. In that circumstance a metal package tends to keep the die at a more constant temperature and you might get slightly better performance.
And if you think the O2 is the weak link, please see: The rest of the time its just unavoidable sighted listening bias–take away the knowledge of which is which and the “differences” disappear. Some of the better audio op amps are specified into ohms.
They offer no advantage over the above parts and are often much worse: This is the follow up with more technical information, a summary of many popular op amps, and some of the measurements I made.
The TL, on the other hand, is obviously having a hard time as it did in the earlier sweep:. And, in reality, the voltage and current specs tend to be mutually exclusive—i. It’s generally poor engineering practice unless the resistor is absolutely required for some other reason or only pure resistive loads are used which rules out nearly all headphones. I suspect only the TL would have stood out.
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The is the corner stone of nearly all high-end professional audio gear which means most of your music has already been well steeped in goodness. It has been a pure delight reading from beginning to end. NwAvGuy March 24, at 7: Daatsheet September 11, at datasehet Hymowitzthe design phase. But this game is all about bragging rights. Something about unity gain allowing for better current amplification compared to having both in one opemp?
I’ve also seen examples of where someone removes a relatively slow op amp from a piece of gear and replaces it with a much faster op amp thinking it’s an upgrade. The only speed issue that matters is the amp should never be slew rate limited. If stability with OPA is an issue, one idea is to wrap the output resistor inside the feedback loop to reduce output resistance, fa-schmidt at headwize reported good results using a 47 Ohm resistor, however I am not too sure how the math translates into the actual output impedance seen by the headphones.
NJM Datasheet pdf – Dual Operational Amplifier – New Japan Radio
If the op amp’s key parameters fluctuate significantly with temperature changes you can get some degradation in the performance from thermal modulation. The following op amp deserves its own category: Short Circuit Protection — Any op amp driving an external output line outs, headphone jacks, etc. The difference is all dissipated as heat. Several things are important to know about the dScope.
The main advantage of the process is low input bias current see OPA which isn’t really a huge concern in this application. XacTactX April 1, at The total sum of the noise out to 22 Khz is how the — Sorry to be picky especially as I made my temperature measurements with the tip of a pinky.
You could use either one.
The industry rule of thumb, even on the recording side of the signal chain, is 0. And that’s all that separates an amplifier from an oscillator. Anonymous June 10, at 3: So it’s an inferior choice for a gain stage.