50watt audio power amplifier circuit


Posted on Feb 5, 2014

The amplifier feeds a brace of speakers with two LM3876 amplifier chip circuits (50 watts per channel), or a brace of headphones Meier Crossfeed through a clarify and a bifold OPA2134 Opamp. There are four selectable band inputs, and achievement buffers with band akin for the registry. The architecture with readily attainable apparatus of acceptable quality, and is


50watt audio power amplifier circuit
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disconnected into four BPC, a ability amplifier for anniversary channel, for the diet board, and for the pre-amp / headphone driver. The achievement selector is beatific to pins J1 and J3. Looking at the larboard channel, C1 and R2 anatomy a low canyon clarify with a-3dB point of 40 kHz, which rejects any RF arrest best up on the interconnections. R2 additionally includes the impedance of the device, in this case, 47k ohms. R1 ensures Opamp U1 is presented with an impedance according to its two inputs, accord to convalescent the achievement of the distortions declared in the datasheet OPA2134. The amount of R1 (9K1) is universally accessible, abutting to the amount of the alongside aggregate of R3 and R4 (22k and 15k, respectively). R3 and R4 set the accretion at that time, aloof beneath 2. 5 in this case. This gives abounding amplitude for a advanced ambit of arresting sources, which could be as abundant as 3VRMS. In this case, the aiguille achievement voltage of 10. 6V would be accomplished with the activity to accumulation ± 15V. This antecedent accretion brings the arresting to a akin that the achievement of the aggregate can advance the ability amp circuits anon after any added benefit, and allows the helmet of the disciplinarian ambit to accomplish with a low gain, gives lower babble level. C7 forms 100kHz a lowpass clarify with R3, to abatement on the accretion of accord at actual aerial frequency, and to advice...




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