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The minimum load for most opamps is 2k ohms. The NE5532 is extra strong and can drive 600 ohms. Its max output current is only 38mA. Some expensive headphones (Sennheiser) are 600 ohms for each ear.how can you drive a lesser than 600ohm impedance headphone? is it okay to connect the output to a speaker e.g. pc speaker??
or changing opamp?Most semiconductor manufacturers make headphones power amplifier ICs and speaker power amplifier ICs. Some people add a complementary-symmetry class-AB transistors output stage to an ordinary opamp so that the output current is high enough to drive low inpedance headphones.
An MP3 player has an output of 100mV to 250mV RMS which is a max of 0.707Vp-p. When you multiply it by your preamp with a gain of 100 then the output of the preamp is trying to be 70.7Vp-p which is way too high and the output of the preamp will be extremely distorted square-waves.it's not the input device that we got a prob, it was a power amp we tested from...when we connected the audio preamp, the volume wasn't loud enough even though gain's at 100 (the vol. was at max. through the pot)...that's why we attempted to increase gain as a sol'n...
An MP3 player has an output of 100mV to 250mV RMS which is a max of 0.707Vp-p. When you multiply it by your preamp with a gain of 100 then the output of the preamp is trying to be 70.7Vp-p which is way too high and the output of the preamp will be extremely distorted square-waves.
Something is wrong. Maybe you didn't read the values of the resistors correctly and the actual gain of the preamp is much lower.