DigiTan
New Member
I'm working on this box to combine the audio from my computer, desk television, and cordless phone into one stereo headset. I have single-rail op-amps like the TL084 and LM386 available. And I want to have one of those op-amps drive the headphones directly if I can get the impedance and distortion right. Otherwise, I'll put something else there. I have a few questions:
1. What's the typical power output from a headphone driver? I can only guess that these are 16Ω to 32Ω headphones. I heard they usually draw around 40mW.
2. Is a dual-rail system really worth the trouble?
3. Does the output impedance of the headphone driver really need to be matched?
The reason for that last question is I read some conflicting articles over whether max power transfer was really necessary with modern op-amps.
Finally, one basic question... In the classic inverting configuration (**broken link removed**), the output resistance is the same as the feedback loop's resistance right?
1. What's the typical power output from a headphone driver? I can only guess that these are 16Ω to 32Ω headphones. I heard they usually draw around 40mW.
2. Is a dual-rail system really worth the trouble?
3. Does the output impedance of the headphone driver really need to be matched?
The reason for that last question is I read some conflicting articles over whether max power transfer was really necessary with modern op-amps.
Finally, one basic question... In the classic inverting configuration (**broken link removed**), the output resistance is the same as the feedback loop's resistance right?