FS810 integrated power amplifier circuit diagram

The figure shows the practical circuit of the FS810 integrated power amplifier. FS810 is an integrated , suitable for high-end radio recorders and audio equipment.

In Figure (a), the speaker is connected between the output capacitor C5 and ground, and a 100kΩ resistor is connected between pin ⑧ and ground to form an AC feedback branch. In order to make the bass rich, additional C (0.047μF) and R4 (8.2kΩ) branches are added, connected between pin ⑥ and pin 12, as a bass boost network. C10 and R5 are bootstrap networks, and R3 and R4 are reactance correction networks, used to eliminate the inductive reactance component of the speaker.

In Figure (b), the speaker is connected between the positive electrode of the output capacitor C5 and the positive electrode of the power supply. The output capacitor C5 and the speaker impedance also serve as bootstrap network components, so there are fewer components and the circuit is simple, but the speaker must be suspended and not grounded.