The power amplifier board is based on the official circuit design of Italian French semiconductor tda7294, and integrates the functions of horn protection, 

6n3 electron tube buffer, power rectification and filtering. 

The power amplifier IC of the board adopts st original 7294, the protection circuit adopts famous Songle relay, the electrolytic capacitor adopts Elna, Nikon, 

black diamond, etc., and the audio coupling capacitor adopts French original TPC capacitor The electronic tube is made of military 6n3 with strong gall smell, 

and the PCB is made of double-sided blue solder resist gold plating process, which is absolutely hifi material. 

The layout and wiring of board components are reasonable, and the noise is very low. It is the best choice for audio DIY players to install!

This board is a set of functions in one body, assembly is very convenient, only need to connect the power supply, radiator, and sound source can work normally,

 while reducing the installation difficulty, but also saving a lot of costs. 

If you buy power amplifier board, power board, gallbladder buffer front stage board, horn protection board, this price is absolutely impossible to buy!

Transformer specification:   24 v-0-24 / 3.9 a * 2

                                                12V/1A

Power:   200W (188w + 12W)

Output power:   80W * 2 (8W)

Board size:   140mm long, 96mm wide, 65mm at the highest point (excluding copper column)

 

Note:

The board must be installed with a suitable radiator before it can work. The output voltage of the transformer should meet the requirements and should not exceed the range, 

otherwise it will cause irreversible damage to the power amplifier board.

After the board is powered on, the red LED indicator starts to flash. About 10 seconds later, the relay is connected and enters the working state. At this time, 

the LED is always on to delay the start-up and prevent the impact sound. In case of abnormal operation of power amplifier board, the relay will immediately cut off the speaker, 

and the red LED flashes until the fault is eliminated, and the LED will return to normal light.