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This circuit is a switching power source , or SMPS , it is based on the MC33374 integrated circuit , which is a switching voltage regulator high power manufactured by Motorola Semiconductor . This switching power supply circuit using the MC33374 will provide a maximum power of around 90 W and requires few external components .  Power Supply Switched 15V x 6A Circuit Diagram The MC33374 is an IC designed to operate directly from a rectified supply line , with a fixed input AC 100 V, 115 V or 230 V, and more than 90 W with a variable AC input varies from 85 V to 265 V.  If you liked this ,Take a few Seconds to Share this and leave comments

This circuit use the IC AN7166  . On circuit have an advantage is very loud sound , although only 30W this circuit is like a 100 W transistor power amplifier. Its so good circuit with IC AN7166 . This circuit require minimum voltage 12 V and Maximum voltage 24 volt , I recomended voltage for this circuit is 18 volt. And use the battery supply current 5 Ampere. Maximum power output of one speaker 30 W with impedance 4 Ohm. See this circuit schematic below : Click image to view large Capacitor thats connect legs IC 4 and 3 is 1 nF . And capacitor thats connect legs IC 9 and 3 is 1 nF. For the input capacitor at 1 uF ( L and R ) for output capacitor at 1000uF with voltage 50 V or higher.

General Description: The TA8260AH is 4 ch BTL audio power amplifier for car audio  application.  This IC can generate more high power: POUT MAX = 40 W as it is  included the pure complementary PNP and NPN transistor  output stage.  It is designed low distortion ratio for 4 ch BTL audio power  amplifier, built-in Stand-by Function, Muting Function, Clip  detector, and diagnosis circuit.  Additionally, the AUX. amplifier is built-in, it can make the beep  signal etc. output to 2 channels (OUT1 and 4).  It contains various kind of protectors for car audio use.  Circuit Diagram:  40 W BTL x 4CH Audio Power IC  Datasheet for TDA8260AH:  Download