Power amplifier on a TDA1552Q chip. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Transistor power amplifiers
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Components C3 and R1 set the delay time for connecting the speakers, which saves them from characteristic pops when the amplifier is turned on. The delay can be adjusted by changing the resistance of the resistor or the capacitance of the capacitor.
Be sure to screw the chip to the heatsink. It can be a piece of aluminum plate measuring 120x50 mm. The larger the heatsink, the more power the microcircuit will give to the load and the less it will overheat. This will also save the chip from triggering its internal overheating protection.
The supply voltage should not be stabilized, as mentioned above, the microcircuit contains a built-in voltage regulator. And the most important thing is that the power wires going to the microcircuit must be twisted, otherwise, when the volume is increased, the microcircuit will "fill up" (these are terrible distortions by ear).
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