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Amplifier on TDA7294


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.
Amplifier on TDA7294



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:
tda_7294.rar [88.54 Kb] (downloads: 484)

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3 commentary
Quote: RadioTower
by cooler.
By a fan, you mean?
Quote: RadioTower
This is the resistance of the chip itself
For you, this parameter value is assigned not to the microcircuit, but to the amplifier.
Author
The radiator has active cooling through a cooler.

Input impedance 100 kOhm
This is the resistance of the chip itself
The radiator is not installed optimally.
Input impedance 100 kOhm
How can it be 100 if the input is already 47? Yes, and the circuit does not match the product.
with a linear rather than a logarithmic characteristic for smooth volume control.
A non-linear characteristic is set all over the world, the Russian name is the inverse logarithmic, the western one is Log or Audio, and by some miracle, you smoothly turned on the linear characteristic. Please explain how this was possible?

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