High fidelity TDA1520 integrated power amplifier circuit

7. The TDA1514 high-performance power amplifier produced by Philips has been widely praised for its excellent quality. However, this circuit
uses dual power supplies. For most audio enthusiasts at present, the first problem they encounter when trying to repair the machine is to replace it. Main power transformer
. However, often the main power transformer also contains an auxiliary power supply. In order to maintain the original function, a dual power
transformer must be added, or a transformer must be re-customized to retain the original auxiliary power supply and contain dual power windings. This article introduces a
power amplifier that can solve the above problems and its performance is comparable to TDA1514. This is the less familiar
20W high-fidelity TDA1520 integrated power amplifier circuit .
    This circuit has the following characteristics:
    (1) Single power supply, wide power supply range (15~50v);
    (2) Low noise, low distortion THD-0.ol% (only)-16W, V':-32V);
    (3) Wide dynamic range (20Hz ~ 20kHz) and high conversion rate;
    (4) Overheating protection, overcurrent protection, AC short circuit protection and noise suppression functions;
    (5) Few peripheral components, simple circuit, ready to install Successfully, no debugging required.
    Although the nominal rating of this integrated circuit is only 20W (THD is only 0.5% at this time), for a room with an area of ​​more than ten square meters,
using the TD A15 20 integrated amplifier is satisfactory. Table 5-1 lists the The main technical indicators of the circuit.