105W Simple Power Amplifier | Schematic Diagrams


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105W Simple Power Amplifier

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simple 105 w power amp 300x228 105W Simple Power Amplifier

105W simple power amplifier is designed for typical connection circuit for IC LM3876T company National Semiconductor and is powered by bipolar unregulated power supply voltage of ± 35 V. The opening of the switch S1 turns on mute.

Despite the simplicity and lack of adjustment elements,
-the amplifier has high performance
-ratio IMD (SMPTE 60 Hz, 7 kHz, 4:1) does not exceed 0.004%,
-typical THD 0.01%, noise level -114 dB,
-frequency response ( -3 dB) 10 Hz to 90 kHz or 20 Hz … 20 kHz ± 0,25 dB level,

So it is suitable for audio of the highest class. The gain is given by Ki = 1 + R9 / R4. The coil L1 is wound around a 2-watt (such as MLT-2) and resistor R8 has 14 turns of wire 1.3 mm in diameter. Chip to the radiator to the thermal resistance of not more than 3 ° C / W («RADIO T9» № 7-8 / 2005 sec. 14, 15 *).

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