This post explains for the radio amplifier.
The Part Number is YD7377.
The function of this semiconductor is 2 x 30W, POWER AMPLIFIER.
The package is SIP 15 Pin Type
Preview images :
The YD7377 is a new technology class AB car radio amplifier able to work either in DUAL
BRIDGE or QUAD SINGLE ENDED configuration.
The exclusive fully complementary structure of the output stage and the internally fixed gain guarantees the highest possible power performances with extremely reduced component count. The
on-board clip detector simplifies gain compression operation. The fault diagnostics makes it possible to detect mistakes during car radio set assembly and wiring in the car. […]
1. SOFT SHORT AT TURN-ON
2. OVERRATING CHIP TEMPERATURE WITH SOFT THERMAL LIMITER
3. LOAD DUMP VOLTAGE SURGE
4. VERY INDUCTIVE LOADS
5. FORTUITOUS OPEN GND
6. REVERSED BATTERY
Easy Single Ended to Bridge Transition :
The change from single ended to bridge configurations is made simply by means of a short circuit
across the inputs, that is no need of further external components.
Other data sheets are available within the file: YD7377V, YD7377H