"TonyL"

I want to drive low-z (32 ohm) headphones using op amps.

For various reasons I need:
1) Quad amps to be used, there's a requirement for other op-amps in the
units.
2) Single rail, around 12-15 V, I guess most modern op amps will do that
easily.
3) Not too current hungry, I want to power a number of these units from
one simple 12VDC transformer supply.
4) Lo-fi will do so long as distortion is not too gross. Intercom quality
is OK.
5) Reasonable cost.

I built a prototype using a LM324 that happened to be handy. Result was
gross crossover distortion when the output had to supply current to the
low-z earphones. I know these amps can be biased into class A operation
but I want reasonable power economy. Would be nice to just drop a pin
compatible device into my prototype, say a LM 387 ?


** Huh ??

The LM387 is a long obsolete, dual low noise pre-amp.

How about you try a TL074 - exact same pin out as the LM324 and no x-over
issues.

Will deliver about 20mA ( = 13mW peak ) into a 32ohm ear phone, which is
plenty loud.




...... Phil