Audio amplifier 2X18W

Posted on Feb 28, 2013

In a lot of cars, the car-radios use amplifiers that their output power does not exceed the 5W with enough distortion in the limits of power. The problem is untied with the utilisation of external amplifiers, that will have the possibility giving much bigger power, with much smaller distortion. With given the voltage operation of car that is + 12V, we do not have the possibility of taking power above a limit. The solution is we use two amplifiers in bridge connection, with result the output power quadruple, at least theoretically and in best, is doubled. A opamp. that it will facilitate a lot in order to we materialise above, easy and with very few external components, is the TDA1516Q, that contain two amplifiers in a chip, with gain 20dB, has protection from overheat and short-circuit.

Click here to download the full size of the above Circuit.

In bridge connection, as in the circuit, we can have output power 18W in load 4R, with distortion 0.5% and power above 20W with distortion near in the 10%, power very good for the area of car. The drive of amplifiers can become from the exit of already existing amplifiers. May it need we interfere in series, a potesometer, with that we will adapt level in such level, so that we do not have distortion from overdrive. The particular circuit can be also used for other uses except car, as drive small speaker computer. The amplifiers should be placed on a good heatsink. Part List C1-2=220nF 100V MKT D1-2=1N5408 F1=3A Fuse C3-4=100nF 100V MKT IC1-2=TDA1516Q S1=2X2 SW C5-6=2200uF 25V M1-2=Loundspeaker 30W/4ohm

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