it seems the TBA820M chip is no longer available with my supplier, they say it is out of production. It's a 1.2 W audio amplifier, mono, with some peripherals (resistors, capacitors). It works well with a 8 ohm speaker. The price for the chip was about 40 cents. My supply voltage is 5 V.
I have tried the LM386N, though it's only a 0.5 W amplifier, meant for a 4 ohm load. Indeed I find the volume too low.
I have tried the TDA2822M, a 1 W amplifier, but also meant for a 4 ohm load; again: volume too low
I'm looking for a good replacement in the same price range. Any suggestions are welcome.
The application is sound for a laser tag gun.