STK6303 integrated power amplifier powered by high-quality switching regulated power supply

The circuit principle is shown in Figure 3-51. The power amplifier part adopts the STK6303 high-power thick film
integrated circuit . Its power supply voltage can reach a maximum of ±sov, and the output current can reach about loA. The monolithic circuit provides stable voltage power supply. ±36V, you
can get loOw sinusoidal power. The operational amplifier AD712 in the circuit is a negative feedback volume control. Its advantage is that it is a
high-quality gain-adjustable (0 to 10 times) preamplifier, using a linear potentiometer, with high balance and no control process. Noise is very practical
and worthy of promotion. As the driving stage of thick film circuit ST K6303, NE5532 is a quasi-II mode. The gain
of this stage is about 15 times. The input sensitivity of this power amplifier is 300mV and the impedance is about 10ktl. It can adapt to various common signal sources (of course, pay attention to the impedance
matching, etc.).