Homemade fully integrated circuit amplifier 02

The circuit principle is shown in Figure 5-60. 6 A set of operational amplifiers of the operational amplifier integrated circuit form a channel preamplifier to
compensate for the loss caused by the insertion of the tone control circuit. Another set of operational amplifiers forms a channel push stage amplifier circuit to
obtain sufficient excitation voltage port RP11. RP4 and other components form a two-channel bass adjustment circuit; RP2, RP3 and other components form
a two-channel treble adjustment circuit. The two-channel volume control circuit is an equal loudness control circuit, which
is composed of RP5, RP6 and other components. At lower volumes, the bass can be boosted accordingly. Adjust RP7'_RP8 to balance the left and right channel volume output. The power
amplifier circuit uses TDA2030 integrated circuit , which has a V-shaped five-pin single-in-line plastic package and is small in size. When using
a ±18V power supply, an output power of not less than isw can be obtained on an 8.0 load and a distortion of less than 0.5%. As shown in Figure 5-61,
it is l. The appearance of M324 and Tf)A2030.