1, input and output signal, conduction power supply voltage, resistance. There's the supply voltage pin, there's the ground wire pin, there's the signal input pin, if it's two channels then there's two signal input pins, and there's an output lead. There should also be two pins connected to the resistance capacitance to control the size of the gain.
2, pin1 for the power amplifier output DC current overload detection. The pin is connected to E of the power amplifier high power tube through an amplifying circuitAt the pole, when the current is overcurrent for some reason, a larger voltage will be generated at the 0.22 ohm resistance of the E pole in series, and the relay will be disconnected when a voltage exceeding the set value is detected. pin2 provides midpoint voltage protection.
3, medium power audio equipment, with small size, large output power, low distortion and other characteristics. And has an internal protection circuit. Italy SGS company, the United States RCA company, Japan Hitachi Company, NEC Company, etc., have similar products, although the internal circuit is slightly different, but the position and function of the leading foot are the same, can be interchangeable.
4, There is no need,There's no point! TB2929HQ, TDA7850 or TDA7854 are power amplifier ics that have nothing to do with sound quality.
5, it is simple, affordable. The rated power is 14W. The supply voltage is ±6 ~ ±18V. High output current, low harmonic distortion and crossover distortion (±14V/4 ohms, THD=0.5%). With excellent short circuit and overheat protection circuit.
6, due to the consideration of power, impedance, distortion, dynamics and different ranges of use and control adjustment functions, different power amplifiers in the internal signal processing, line design and production25W, different power.
TDA7388 at the impedance of 4 Ohm, 12V power supply, can output a maximum of 4x45W power, if the supply voltage is lower than 15V, the output power can not reach 45W. Change to 75W (if the impedance is also 4 ohms), long working time may damage the TDA7388, and the sound quality will not be better than before. It is recommended that you do not change to a 75w speaker.
This is the case with power amplifiers. 45W is the maximum power (max), not the rated power, which is much smaller. 14V, 1KHZ, 26W, (distortion rate) 10%, (that is, the maximum volume distortion is very large, and the sound may be broken). 12V, 1KHZ, small 26W, 50HZ May only be 20W, so 40W speakers are too big.
The 7388 is a new Class AB audio power amplifier designed for high-end automotive radio applications. Thanks to the fully complementary PNP/NPN output configuration, the TDA7388's rail-to-rail output voltage fluctuates without the need for a bootstrap capacitor. The extremely reduced number of components allows for very compact collections.
Car power amplifier 7315 and 7388, 7388 is good, because 7388 is an improved version of 7315. The sound is clear and full, soft and transparent, the music is full, the sound field is very wide, and the overall feeling is strong and strong. 7315 use effect is not good, the power amplifier is too small.
1, -VCC negative voltage; LOUT L channel output; VCC positive voltage; ROUT R Channel output. Class A power amplifier refers to the entire period of the signal (plus or minus two and a half weeks of the sine wave)A class of amplifiers in which none of the power output components of the amplifier appear current cutoff (that is, stop output).
2, -VCC negative voltage; LOUT L channel output; VCC positive voltage; ROUT R Channel output. Class A power amplifier refers to a class of amplifiers in which no current cutoff (that is, stop output) occurs in any power output element of the amplifier during the entire cycle of the signal (plus or minus two and a half cycles of the sine wave).
3, Toshiba TB2929AHQ. According to the Pacific auto network inquiry, Toshiba TB2929AHQ is a car cdThe power amplifier chip. This is a four-channel car audio special power amplifier chip, using the output form of BTL, peripheral components are few but excellent sound quality.
4, TB2929 is 45W*4, and TDA7388 is 41W*4, are automotive power amplifier, from the power point of view TB2929 is still a little larger, the practical application can not distinguish the difference.
5, TOSHIBA. TB2930AHQ is a TOSHIBA power management chip, which is connected to the Japan Chemical 25V4700UF filter capacitor, and should be used with the Toshiba horn.
6. Not bad. Sound quality, circuit design, electronic materials, software debugging. Sound IC, this is the key to sound quality, what kind of IC determines what kind of sound effect. Different solutions, manufacturers hardware and software design, parameters are not the same.