How to adjust the TDA1514A amplifier 02

(1) The operating voltage of the power amplifier integrated circuit cannot exceed ±27.5V. It is advisable to select ±23V to ±25v. This article has used the limit voltage of
the power amplifier integrated circuit ±30V. With the fluctuation of the mains power grid, two 1514A units have been damaged. , therefore, the operating
voltage must not exceed ±27. sv.
    (2) To adjust the ov voltage at the output point of the power amplifier, a DC servo circuit must be used. As shown in Figure 5-5, the 6 servo circuit can better
solve the drift of the DC potential at the output end of the power amplifier. The power supply for the servo circuit can be taken from the ±25V voltage, or it can be
supplied to the servo circuit by winding another set of double ISVs through a transformer and rectifying the three-terminal voltage, as shown in Figure 5-6. It would be better if an active servo power supply is used
. The op amp integrated circuit used in the servo circuit. Many enthusiasts like to use the NE5532, the king of op amps. When using this op
amp integrated circuit, use the NE5532N type. It is best not to use the NE5532P type, because the P type is prone to self-excitation and will cause It is difficult to adjust
the zero potential, and it may damage the power amplifier circuit. It is difficult to buy American products for NE515 32N on the market. It is better to use
operational amplifier integrated circuits such as LF358.LM368.C4558 . If you use C4558 (Nissan, the price is better NE5532 (half lower) effect