1, when the power supply voltage exceeds its limit voltage, it will produce a silent state of overvoltage protection. Look at the official data sheet. It's easy. Upper clearEach parameter is clearly stated. Standby and silent voltage of 5v and 5v means that to reliable boot and non-silent these two feet need a minimum voltage of more than 5v.
2. Normal. 7388 power amplifier standby pin 4 and silent pin 22 are connected to the normal output voltage is 12v, if the voltage is higher than 12v, it means that the standby foot has a short circuit, which needs to be replaced and repaired.
3, foot 5v boot, 5v standby. 22 pin 5v work, 5v mute. The two feet are high voltage to play the sound normally, using 22 alone can be connected to the 5v power supply. Abnormal voltageAlways check the external voltage signal line.
4, button battery 9v is not normal. According to the relevant public information, under normal circumstances, the voltage of the button battery is generally about 3V, 9V indicates that the battery power is damaged, and the new battery should be replaced as soon as possible.
1, different, can not be replaced. DA7388 can connect to 2 euros, TYD7388 can not, now the high-end are using TDA7850.
2, output power Output power: the unit is W, because the measurement methods of various manufacturers are not the same, so there are some different names. For example, rated output power, maximum output power, music output power, peak music output power.
3, TDA7388, 4-channel BTL power amplifier IC. -VCC negative voltage; LOUT L channel output; VCC positive voltage; ROUT R channel output; MUTE This pin can control both mute and power on, depending on the voltage to the VCC; -VCC Negative voltage.
1, the power amplifier chip is very good, because its performance is very good, it uses the Qualcomm Snapdragon 888 processor, which is a flagship level processor chip that runs nearly 900,000 points.
2, pioneer custom model called PA2030, thrust 4*60W greater. The previous generation of the TDA7850 is the TDA7560, which is also a MOS tube with a slightly smaller thrust of 4*45W and a slightly larger heat. 7388,7850,7560 chip peripheral circuit is basically the same. The 7388 ground capacitance is 470uF except for one pin 6.
3, Android large screen amplifier TDA7850 chip is the best. TDA7850 is a high-end MOS tube sound chip from ST, with real sound and high thrust. The power amplifier chip is a chip with power amplification function, and the power amplifier circuit usually includes special problems that do not exist in voltage amplification or current amplification circuits.
4, the power amplifier has three versions. TDA7850 uses double-sided gold-plated plate, very few components, IC was originally a four-channel BTL IC for automotive power amplifier, but the sound quality is excellent, the installation is also extremely simple, using a single DC 12V, the limit is 15V, productMOS tube is used to amplify the output, and the output power is large and suitable for low resistance speakers.
5, TDA7850 is a 4×50W MOSFET output stage audio amplifier chip, TDA7377 is 2×30W audio, so the former power is greater.
6, the middle voice is rounded, the bass is more powerful. For general music requirements, integrated IC amplifier is also acceptable. If you are A HIFI person or have more requirements for music, it is still recommended to find separate parts AB or A class.
and 7850 are both power amplifier models, their main differences are: 7388 is a 9 needle tube, 7850 is a 7 needle tube, different pins. The maximum output power of the 7388 is 10W, and the maximum output power of the 7850 is 25W, with different powers.
The noise factor is different: the noise factor of the 7850 power amplifier chip is usually lower than that of the 7388 power amplifier chip, which means that the signal-to-noise ratio of the 7850 power amplifier chip may be higher in the case of the same output power. Prices vary: due to power, voltage, resistance, etcThe 7850 power amplifier chip is more expensive.
TDA7850 is the field output integrated circuit of the TV, and TDA7388 audio power amplifier integrated circuit. An integrated circuit is a tiny electronic device or component.
and 7850 are both power amplifier models, their main differences are: 7388 is a 9 needle tube, 7850 is a 7 needle tube, different pins. The maximum output power of the 7388 is 10The W, 7850 has a maximum output power of 25W, and the power varies.
TDA7850 is a TV field output integrated circuit and TDA7388 audio amplifier integrated circuit is not the same function, so it can not be replaced. The input capacitors of pin 11, 12, 14 and 15 of the TDA7388 can be replaced with WIMA audio fever capacitors, and the capacitors of pin 6 and 20 can be replaced with black gold steel capacitors.
The noise factor is different: the noise factor of the 7850 power amplifier chip is usually lower than that of the 7388 power amplifier chip, that is, in the case of the same output power, 7The 850 power amplifier chip may have a higher signal-to-noise ratio. The price is different: Due to differences in power, voltage, resistance, etc., the price of the 7850 power amplifier chip is more expensive.
Replace the TDA7388 with the TDA7850, without replacing the 470uF filter capacitor (in the case of normal capacitance), it can also work normally, but usually replacing the TDA7388 with the TDA7850 is to hope that the overall sound quality can be better, so the replacement of a better and larger filter capacitor is more guaranteed to improve the overall sound quality.
is different and cannot be replaced. The DA7388 can handle 2 euros TYD7388 is not acceptable. Now the high-end ones use TDA7850.
Check whether there is a short circuit at the output end, is there a virtual welding? Make sure that both sides of the PCB board are welded, pay attention to check the fourth foot, the 22nd foot; If the door horn is changed or the door is soundproofed, pay attention to check whether the wiring part of the horn is in contact with the aluminum film of the door's iron sheet or soundproofed cotton or short circuit.