Direct connection to speakers (usually requires an external output protection circuit).

To download the full STK412-230 Datasheet PDF, you can visit authoritative component repositories:

The biggest headache with these modules is accidentally miswiring the power or ground. Here is the functional pinout you will find in the STK412-230 datasheet PDF:

The is a Hybrid Integrated Circuit (Hybrid IC) manufactured by Sanyo (now ON Semiconductor). It is primarily used as a Class AB Audio Power Amplifier .

For hobbyists and repair technicians, the STK412-230 is both a relic of high-end analog audio and a challenge to maintain. Since Sanyo stopped production, many modules found today are "new old stock" (NOS) or salvaged from legacy hardware. Are salvaged Sony ICs worth keeping? - Facebook

To view the complete, original , you should:

: Frequently used as a direct replacement for failed modules in older high-end receivers. Technical Resources & Datasheet PDF