High performance DC power amplifier drive circuit AP500A-03

Because AP500A has so many advantages mentioned above,
its application in audio has incomparable advantages.
AP500A can be used to produce various unique power amplifier circuits such as OTI, ") CI, rK,
BTL, Class A and B, super Class A, Class A, etc. Figure 3-21 and Figure 3-22 are typical AP500A DC power amplifier application circuit is shown in Figure 6. The AP500A module is used for voltage amplification of the power amplifier and drives the VT1 and VT2 power amplifier tubes. VT1 and VT2 are responsible for the current amplification tasks of the power amplifier. Figure 3-22 uses a VMOS field effect power amplifier tube. The VM with electronic tube characteristics ()S power amplifier tube is used with AP500A with DC field effect input , which can give full play to the unique characteristics Figure 3-23 is the power supply circuit of this power amplifier, Figure 3 —21, 3-22 When using ±42V power supply, the output power is up to 2, oow Within the operating voltage range (including ±4zv, ± 28V), the circuit can work normally without debugging. Those who have strict requirements on the working status of the power amplifier tube can connect an adjustable resistor as shown by the dotted lines in Figure 3_21 and Figure 3-22. To set the working status of the final power amplifier tube VTl.VT2 (such as Class B, Class A, B or Class A, you can also connect some auxiliary components to the peripheral circuit to make VTlVT2 enter the super Class A working state). In addition, because the power amplifier The tube is used for current amplification in the final stage of the power amplifier , and its power consumption is large, so an auxiliary radiator with a heat sink is required.