OPAMP tests into a 270 ohm loadA friend was modifying a cheap headphone amp, and was wondering which OPAMP would work the best.
So I created a similar circuit and measured several different OPAMPS loaded with 270 ohms as a 'typical' headphone load.
Note: Don't only look at the headline THD figure - also note the harmonic distortion even for some that measured well.
PSU: 15 - 0 - 15
Output: 2.7V RMS
Load: 270 ohms
|NJM2043DD||0.00101%||JRC / NJM|
|NJM4558DD||0.00604%||JRC / NJM|
|NJM4565DD||0.00502%||JRC / NJM|
|NJM4580DD||0.00082%||NJM / JRC|
|OPA2604AU||0.00132%||Sample #1 - brand unknown|
|OPA2604AU||0.00139%||Sample #2 - brand unknown|