Стереоусилитель, плата усилителя мощности TDA7294 70W x 2
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Описание
TDA7294 is a high power and high voltage DMOS high precision power amplifier IC produced by ST (SGS-THOMSON). The package is a single row double row 15-pin package. (power supply voltage) ± 10 --- ± 40V (output power peak value) 10A (RMS continuous output power) 70W at 70W at 4Ω. Distortion <0.006%. The design of this chip focuses on tone and has the advantages of bipolar signal processing circuit and MOS power supply. It has the characteristics of high voltage resistance, low noise, low distortion, and very close to sound reproduction; And it has a silent standby function, short circuit protection and overheating protection functions make its performance more perfect. Note: This board is DC powered and cannot be directly connected to the output of the transformer. A power supply must be added. Product: 1.6mm fiberglass circuit board, the connection is original brand new WIMA, the chip is original brand new, other parts are imported brand new parts, such as chemical industry, ELNA, ruby, Siemens.Installation and use Note:1. The working power supply is DC voltage, which cannot be directly connected to the transformer. It must pass through the power supply.2. Insulating particles and insulating sheets must be installed between the chip and the heat sink.3. It is recommended to use double transformers 15-28V with a power of at least 100W! Speaker impedance is 8 ohms. It is recommended that the output voltage of the transformer be double 24V. When the speaker impedance is 4 ohms, the output voltage of the transformer is recommended to be less than 21V, and pay attention to the increase in heat dissipation area. During the power test, the input signal on the board must be connected to the load, and it must not be suspended, otherwise there will be inductive noise, and the signal line must be shielded as much as possible. If the card is installed in a chassis, the Chassis Enclosure must be connected to the ground input wire on the card. If it is added to the front stage, the input surface of the rear stage should not be connected to the chassis, as long as the input surface of the front is connected to the chassis, that is, if both are connected, it will cause a ground loop and cause noise. There are several situations, in which TDA7294 is prone to fireworks (IC burning), because the output end is a field effect tube: 1. The positive and negative voltages of the power supply are asymmetrical. If the voltage rectified by the transformer is +35V and -30V, fireworks! When the capacitor is not discharged, power to the IC and fireworks! (Pay special attention to this when soldering yourself) 3. Touch the input terminal manually when power on and work, fireworks!4. The chip and heat sink must conduct good thermal conductivity, and the heat sink must be well insulated if it is grounded, because the cor
Свойства товара
- Конфигурация звука: Stereo
- Звуковые эффекты: Noise Reduction
- Коэффициент нелинейных искажений, %: 0.006
- Страна-изготовитель: Китай
- Тип: Усилитель мощности