Amplifiers

Most of these are class D unless noted. I like class D most of the time.

National series

• LM386 noise outdated analog pretty cheap inefficient class AB but not really cheap compared to better newer amps
• LM4853 "Boomer" costs too much, love that product line name "Boomer" I mean ???
• LM48560 piezo / haptic driver

• TDA2050 high output obsolete class AB
• TDA2822 $4.5 obsolete
• TPA2012 see adafruit

• PAM8302 mono chip is around $.40 Adafruit breakout is $3.95

• PAM8403 very common very quiet obsolete I have 2 from All Electronics
• PAM8406 upgrade to 8403 chip is $.84 and boards run around $1-$10 I ordered a couple spendy ones from Amazon, about $7 each

The PAM8406 has a mute control and a mode control (Class AB or Class D) and sometimes those pins are not brought out. The board I bought today has a 2 gang volume knob and those signals are available.

There's a MAX58937 or something from Adafruit that has an i2s input instead of analog.

I have several 20W boards including one in my junk box