Προσφατα εβαλα κατι 1611 σε δοκιμη, τα αποτελεσματα ειναι εξαιρετικα. Μαζι με τον AD797 απο τα κορυφαια μονολιθικα op amp.
Ζητησα στον Chat να μου κανει μια συγκριση με αλλα γνωστα τελεστικα για χρηση ηχου
The OPA1611 (single) and OPA1612 (dual) are widely regarded as *reference-grade audio op-amps*, and they sit near the top tier when compared with other single/dual designs used in audio signal chains.
Here’s how they stack up in a technically meaningful way:
## 1. Core performance characteristics
**Noise (critical for audio transparency)**
* OPA1611/1612: ~**1.1 nV/√Hz** → extremely low
* This rivals or beats classics like:
* NE5532 (~5 nV/√Hz)
* TL072 (~18 nV/√Hz)
* OPA2134 (~8 nV/√Hz)
➡️ Result: significantly better SNR in low-level signals (e.g., DAC I/V stages, mic pre front-ends).
**Distortion (THD+N)**
* OPA1611/1612: ~**0.000015% (−116 dB)**
* Competes with ultra-high-end parts like:
* LME49720
* AD797
➡️ Practically below audibility in well-designed circuits.
**Slew rate & bandwidth**
* ~27 V/µs, GBW ~40 MHz
➡️ Fast enough to avoid slew-induced distortion even at high amplitudes and frequencies.
## 2. Architecture differences vs other op-amps
**Bipolar input stage (OPA161x)**
* Lower voltage noise than JFET designs
* Higher input bias current (but still modest)
Compare to:
* JFET designs (e.g., OPA2134, TL072):
* Higher noise
* Lower bias current → better for very high impedance sources
➡️ Trade-off:
* OPA161x excels in **low-impedance, precision audio paths**
* JFET parts still preferred for **instrument inputs or passive pickups**
## 3. Single vs dual (1611 vs 1612)
* **OPA1611 (single)**
* Slightly better channel isolation
* Preferred in *ultra-high-end mono signal paths*
* **OPA1612 (dual)**
* Same core performance
* More practical for stereo designs
* Slightly more crosstalk, but negligible in most applications
➡️ In real-world audio gear, the 1612 is far more commonly used.
## 4. Power consumption vs performance
* OPA161x: ~3.6 mA/channel → moderate
Compare:
* NE5532: similar consumption
* TL072: lower power but worse performance
* AD797: higher power and more finicky
➡️ Good balance of **performance vs thermal/power constraints**
## 5. Stability and usability
Where OPA161x stands out:
* Unity-gain stable
* Not overly sensitive to PCB layout (unlike some ultra-low-noise parts like AD797)
* Works well in:
* Active filters
* DAC output stages
* Line drivers
➡️ Easier to implement *correctly* than many competing “audiophile” op-amps
## 6. Subjective/audio engineering perspective
In controlled measurements:
* Transparent, neutral, no coloration
* Extremely low noise floor
* No “character” (which is exactly the goal in high-fidelity design)
Compared to:
* NE5532 → slightly noisier, older but still robust
* TL072 → softer/high-noise, often used in musical gear for character
* OPA2134 → smoother but less precise
---
## 7. Where they are *not* ideal
Despite their strengths, OPA1611/1612 are not universal:
* High-impedance sources → JFET input better
* Battery-powered gear → not the most power-efficient
* “Coloration” designs (guitar pedals, vintage emulation) → too clean
## Bottom line
* The OPA1611/1612 are **top-tier general-purpose audio op-amps**
* They outperform most legacy designs (NE5532, TL072, OPA2134) in:
* Noise
* Distortion
* Linearity
* They compete closely with elite parts (AD797, LME49720) but are:
* Easier to use
* More stable
* More versatile
Οποτε μιλαμε για ενα εξαιρετικο τελεστικο (1611, ο 1612 ειναι το ιδιο σχεδιο σε διπλο τελεστικο) για σταδια εξοδου και αναλογα με την περισταση γενικοτερες εφαρμογες ηχου. Μπορω να επιβεβαιωσω απο τις ακροασεις μου πως παιζει απεριγραπτα διαφανα και με καταπλητκικη λεπτομερεια.
Η διαφορα στην τιμη δεν ειναι αμελητεα, ενας 5532 κοστιζει 5-6 φορες λιγοτερο απο εναν 1612 και ενω για εμας τα 1.2€ vs 7€ δεν μας λενε πολλα για αυτους που πουλανε πλακετες η διαφορα φαίνεται. Η Lampucera μου πχ εχει ενα κλασσικο 5532 επανω και συντομα θα φυγει για να μπει μαλλον ενας 1612 (ή διπλος 1611 σε βαση, θα δείξει)
