Wednesday, November 2, 2011

400 Watts High Power Output Amplifier

400 Watts High Power Output Amplifier.
 TDA7294 with A1943-C5200, K1530-J201, A1302-C3281 Circuit Diagram

The famous SGS-Thomson Microelectronics ST was a Hi-Fi High Power DMOS TDA7294 amplifier circuit, the bile of his good taste, thanks to its internal circuit between input and output devices, field effect, they are softly rounded, tender.
But the amplifier with its mounting only a single TDA7294 power only 70 watts, the right of access is BTL is 100 watts from the top down, do not feel to mitigate this power. Tests, the author of several used to be TDA7294 level, direct-drive 3:59 pairs of parallel transistor high power, high current output, the output power of 400 watts mono, and the circuit support and easy to debug no need to reliably basically retained ICR, a solid and performance.
Ruzuo The following figure shows the feedback resistor R6 is better for the author of the Ω value in the Debug 22 k suitable R6 also decided that to win the circuit, increasing the gain value.
Quiescent current depends on the strength of R7, R8, provided their value in the next 10 k Ω, the circuit in the Group A state quiescent current working set of 100 mA ~ 2A, the author of 30 k Ω, the circuit in the group B and relatively stable performance with no radiator in 2/3 volumes, promoting the President of 10 inches and 10 minutes later, power was not feeling that hot “thickness strong enough.
The author examines the power of the T1, T2, was A1943/C5200, K1530/J201, A1302/C3281 K1530/J201 the best sound quality, very soft Naiting. A data card, the power of 200 watts, in Group B Working with a small heat sink (I use 14 cm x 5 cm x 3 cm) to meet their cooling needs. The commissioning of the system without ring box.

Power amplifier 450W

Circuit of power amplifiers with power output of 450 watts mono , amplifiers are also frequently used in the amplifier a high-power amplifier, which used in an event, in the field and the placed closed. Because this amplifier suitable for the woofer, fullrange speaker, and can also be fixed for the subwoofer speaker. To further strengthen and maximize the amplifier ,its power supply circuit also must be accurate, for electrolytic capacitors in power supply ,voltage capacitors use 80V or more, and a capcity 20000uF upwards, so when the bass amplifier is high , the voltage is not lot of experience dropping. Diode bridge use a minimum of 35A, or adjust the current input voltage. If the power supply has fulfilled the desire, the supply to the power amplifier.
In the buffer circuit uses PNP transistor A1266 / A564 / A733 /A1015 / A798 and NPN with MJE340.To the driver circuit using PNP transistor MJE350 and MJE350. For the final amplifier circuit use two set 2SC2922 and 2SA1216. Use a quality sanken transistor to maximize quality sound output.
To supply the required voltage to the  amplifier circuit minimum of 7 Volt and a maximum of 24 volts . Incurred sizable ouput for amplifier ic 300 W maximum output.

R4_____________________________________2.2R 2W