A4 Full Symmetrical Double Differential High Power Amplifier Board PCB Bare Empty Board

• 1) A4 is specially designed for HIFI users who need high power output, demanding sound quality and high fidelity output. The output dynamics are very large, the low frequency is full and powerful, and the high frequency penetration is very good!

2) It is recommended to use the American ON Semiconductor 0281/0302

3) The board has its own filter and rectifier. In the case of proper matching, the single quality of this power amplifier is close to the professional burn-in power amplifier board of several thousand yuan. The reasonable ground wire layout and 40000UF filter capacitor ensure that the noise of the power amplifier board is very low.

4) Because the power of the machine is relatively large, pay attention to the heat dissipation must be installed well, and at the same time coated with thermal conductive silica gel, this is a safety guarantee, the heat dissipation is not tight under high power, and the tube will be damaged.

5) Output power: 300W+300W total 600W

Power input AC dual 20-50V, speaker protection AC independent AC 11V to 18V can be.

Frequency response 20HZ-100KHZ

Dimensions: 111*227mm thickness 1.6mm

Harmonic distortion less than 0.005 10W/8R

Matching speakers: 4-8R 50-600W 5-15 inch KTV speakers, floor speakers, stage speakers.

6) If you buy a spare part, use 10R for the base resistance of the silk screen 2.2R, and the default is 10R. After the installation is completed, adjust the quiescent current, adjust an adjustable resistance for 1 channel, and test the voltage across the 0.27R 5W white cement resistance. . It can be measured as 10-50MV. It depends on the size of the heat dissipation. If the heat dissipation is insufficient, reduce the voltage.

7) The filter capacitor is 10000UF/80V, suitable for AC50V with the highest AC input.

8) Also note that the limit of the board can go to AC50V to work, but the transformer should be within 50V as much as possible, because the mains 220V will fluctuate, and many areas go to 230-240V, so the board will overvoltage.

The highlights of this product to its similar amplifiers:

1: This circuit architecture is the most stable double differential fully symmetrical architecture. The sound quality is very HIFI-shaped, delicate, full, natural, and the dynamics are very good. Kili those circuits are comparable.

2: The protection circuit is about 2 Omron relays, each of which provides 10A output current. Some professional machines on the market only use 1 5A relay, the output current is completely closed, and the energy transmission is greatly reduced.

3: The highest can work at AC 50V, which is close to positive and negative DC 70V stable work.

4: US ON A42 A92 is used for the small tube. This tube must be used by foreign high-end machines.

5: Use a 600W transformer