Use TDA2030 to provide dual power supply to NE5532

The preamplifier in the power amplifier generally uses dual power supply, that is, symmetrical positive and negative power supply. When doing amateur production, there will be no power supply at hand, which brings difficulties to production. This article introduces the use of TDA2030 to convert single power supply into dual power supply to power the preamplifier NE5532. The circuit is shown in the attached figure.

TDA2030 (IC1) is a high-efficiency operational amplifier that uses its complementary output to convert unipolar power into the required bipolar power. In the figure, R1 and R2 with equal resistances form a voltage divider. The midpoint of the voltage divider is connected to the non-inverting input terminal of the IC1 operational amplifier, and IC1 is connected as a voltage follower to make the potentials of the O' and O terminals equal. . The O' terminal is a virtual point, which is completely isolated from the ground terminal of the input power supply. C2 and C3 are the filter capacitors of the positive and negative power supplies respectively. The positive power supply is output from the "+" terminal of C2 and added to the ⑧ pin of IC2 NE5532. The negative power supply is output from the "-" terminal of C3 and added to the ④ pin of IC2 NE5532. The O' terminal is the ground terminal of IC2. Since NE5532 has been introduced a lot in previous articles, I won’t go into details here. The component values ​​are marked in the circuit diagram. As long as it is made according to the diagram, it can generally work normally without debugging. However, the single power supply must use a regulated power supply to ensure that the NE5532 can work reliably.