There was a thread going on in here that died out before we got to the heart of the matter. It concerned an audio amplifier built around an LM386 that was a little too noisy for their use.
I'd like to take it a step further. I've got a pet circuit that I use for opamp input driving what we used to call complementary symmetry output devices, but I'm always willing to learn new tricks.
Here's my limitations: Drive (using smaller or larger devices) between 4 and 600 ohms, separate amplifiers for the hi-z and lo-z loads. Automotive battery supply, so PSRR with gawdawful spikes necessary. Prefer to drive as close to the rails as possible. Voice only, no music, up to 10% distortion acceptable. Cheap parts -- LM324, TIP output devices for high power,
2222/2907 for the low power. Automobile environment ... hot in the summer, cold in the winter.
Anybody got any pets that they are very happy with?
Jim