Electronics: OPAMP THD tests into a 2.7k load
These are some THD tests I performed of various OPAMPS into a 2.7k load.Note: Don't only look at the headline THD figure - also note the harmonic distortion even for some that measured well.
Measurement parameters:
PSU: 15-0-15 Gain: 2.2 Output: 2.7V RMS Load: 2.7k ohms
| Opamp | THD | Brand | Notes |
|---|---|---|---|
| AD712JN | 0.00041% | Analog devices | opamp reclaimed from vintage equipment. |
| AD746JN | 0.00022% | Analog devices | opamp reclaimed from vintage equipment. |
| AD827JN | 0.00036% | Analog Devices | Supplied with Chinese kit - may be fake. |
| LM4562NA | 0.00016% | Texas | Genuine device |
| LT1358 | 0.00042% | Linear Tech. | Genuine |
| NE5532N | 0.00020% | no data | no data |
| NJM2043DD | 0.00016% | JRC / NJM | Good low noise op, doesn't like heavy loads. |
| NJM2068DD | 0.00020% | JRC / NJM | Competitor to NE5532 |
| NJM2114D | 0.00026% | JRC / NJM | Pulled from vintage gear |
| NJM4558DD | 0.00059% | JRC / NJM | Pulled from vintage gear |
| NJM4565DD | 0.00025% | JRC / NJM | Pulled from vintage gear |
| NJM4580DD | 0.00017% | JRC / NJM | Pulled from vintage gear |
| OPA2111KP | 0.00222% | Unknown | Note poor harmonics |
| OPA2134PA | 0.00085% | no data | BB |
| OPA2604AU | 0.00017% | no data | no data |
| NE5532N | 0.00024% | no data | Pulled from vintage gear |
| NE5532 | 0.00016% | Unknown | Measurement limit |
| NE5532 | 0.00020% | Signetics | Pulled from vintage gear |
| TL072CP | 0.00152% | Texas | Pulled from vintage gear |
