I think OPA827 does deliver that. BUF634 adds some of the Burr-Brown character to the sound, but with 827, the sound is drier than with other Burr-Brown opamps, so I don't think that 827 adds much character of its own.

2008年10月10日 · OPA827 Equivalent Circuit. OPA827 is a non-complementary input stage and vas. Followed by a complementary output buffer The input uses 4 N-JFETs, in differential configuration. One JFET pair is used to mirror the bias 'tail current' into the input pair. The emitter current of input pair is fed into emitters of a pair of PNP BJT.

2008年12月16日 · The OPA2107 has been added to my options for the dual opamp phono preamp, which is a passive design. I have compared the original design, particularly with passive parts they were using, and it simulates a bit worst than the design proposed by Walt Jung on his book and which also is available on the Web.

With OPA827 and OPA627, the second harmonic (40kHz) was larger than the fundamental wave of 20kHz, and 40kHz was regarded as the fundamental wave, so THD could not be measured. 🤣 OPA827 OPA627

2008年3月10日 · The OPA827 doesn't appear to available yet. I would guess that the model will be available when the part is. Keep an eye on the TI web site. National has the LM4562 family on their web site. Apparently the model works for the whole family of very similar parts.

2013年7月22日 · Simple diamond buffer based on a WJ design. Enclosed in the feedback loop of an OPA827. DB open loop distortion is 0.0006xx% THD20 at 2Vrms into a 250 Ohm load. Enclosed in the OPA827 feedback loop distortion is 0.000020%THD20 at 5Vrms into a 250 load. Note : I find this too optimistic, maybe...

2019年2月25日 · I see no reason to pay a premium for the opa827. The opa1641 does more than fine for much cheaper and can be used non inverting without performance degradation compared to inverting. See fig 7 in the datasheet. It can also be used after a pot as it's rather insensitive to input impedance. See fig 6 in this app sheet.

2023年6月15日 · However, BB(TI) products since the new OPA827 have improved significantly. I am not familiar with the physical properties and process technology of semiconductors, but it may be due to silicon germanium. OPA827 and OPA1641 are excellent when Rs is high, but OPA828 is superior when Rs is 3kΩ or less. I This is the range when using a 10kΩ pot.

2019年2月25日 · Hello, I'll try in my spare time. I would need a list of components from a European distributor, TME, Mouser, and final schematics.

Compared to OPA627 and OPA827, OPA828 has improved headroom. However, there is a difference from rail-to-rail OP-AMPs. I got OPA828 as soon as it was released, loved it, and have been using it for over four years, but I never noticed anything.