TDA1308 FI-FI earphone amplified circuit ----- HiFi Headphone Amplifier

TDA1308 FI-FI headphone amplified circuit, HIFI Headphone Amplifier Keywords: TDA1308 Headphone Magnifying Circuit TDA1308 HIFI headphone amplified circuit TDA1308 is a special headset amplifier integrated circuit introduced by Philips, its excellent performance makes the past TDA2822, TDA7050, LM386 and other "classic" amplifiers. Common information introduction is basically used in power supply (3 ~ 7V), in fact, TDA1308 is also a double op amp, and the pin function is exactly the same as NE5532. However, it is difficult to use it to directly change the usual NE5532, etc., because its operating voltage is very low (highest is only ± 3.5V), the size is only 5.8mm × 4.8mm × 1.75mm, And its "disadvantages" and its extremely low power consumption (about 5mA, working at a quiescent current) and operating voltage (as low as ± 1.2V, this time, there is still no change), it is undoubtedly the production The preferred choice for mini-low voltage circuits such as stereo single and radios. Another advantage of TDA1308 is that the signal-to-noise ratio is extremely high (up to 100 dB), and actually audition shows that there is much better op amp. The Hi-Fi stereo single discharge machine made with TDA1308 is described below, and the circuit is shown below. Each channel has been used, and the two amplification units have served as preamp and amplifiers, respectively, and improved the separation of the channel, and their three-dimensional sense is very good. The room for motor steady speed is large, as long as the working voltage is suitable, such as the AN6650, KA2201, etc., it will not be introduced here. It should be pointed out that TDA1308 uses the MOSFET as the input stage and output stage, and the input bias current can almost no, prevent the possibility of the bias current over ambulance of the magnetization, this is also the use of transistors such as NE5532, etc. Else can't be. The circuit is powered by a dual power supply, and the voltage can be selected between ± 1.5V to ± 3V. Because the coupling capacitor is eliminated, the high signal to noise ratio of TDA1308 is not allowed to have a background noise, so the sound quality is very transparent. It may be because the TDA1308 is low, the current is small, and it always feels slightly smaller, slightly thin, and it is a bit of a sense when driving a slightly large earphone. But its refreshing tone is still worth "burning

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