The advantages of TDA7294 include the following:
Output power, with distortions of 0.3–0.8%:
70 W for a load of 4 ohms, conventional circuit;
120 W for 8 Ohm load, bridge circuit;
Mute function and Stand-By function
low noise, low distortion, frequency range 20–20000 Hz, wide range of operating voltages - ± 10–40 V
Amplifier Specifications:
Power - Bipolar (+ -12 to + -40V)
F out. - 20-20000 Hz
P out.max (power + - 40V, Rn = 8oM) - 100W
P out.max (feed. + - 35V, Rн = 4оМ) - 100W
K-harm (Rvykh = 0.7Рmax) - <0.1%
Uin - 700mV
The peak value of the output current is 7A
Input impedance 100 kOhm
Parts List:
Capacitors:
C1. Film, 0.33–1 μF.
C2, C3. Electrolytic, 100–470 μF 50 V.
C4, C5. Film, 0.68 uF 63 V.
C6, C7. Electrolytic, 1000 uF 50 V.
Resistors:
R1. Variable dual with linear characteristic.
R2 – R4. Ordinary low-power.
Resistor R1 dual since stereo amplifier. Resistance is not more than 50 kOhm with a linear rather than a logarithmic characteristic for smooth volume control.
The TDA7294 has a Stand-By mode and a Mute mode. These functions are controlled through pins 9 and 10, respectively. Modes will be turned on while there is no voltage at these terminals or it is less than +1.5 V. To “wake up” the microcircuit, it is enough to apply voltage greater than +3.5 V. to terminals 9 and 10.
Protection:
surge protection;
protection of the output stage against short circuit or overload;
thermal protection. When the chip is heated to 145 ° C, the Mute mode is turned on, and at 150 ° C the Stand-By mode is turned on
protection of microcircuit pins against electrostatic discharges
Pay:
Work video