Unique amplifier circuit schmeatic based on IC TDA7255

This circuit equipped with 2 switches that are useful for loudness and filtering, on SW1 as the loudness , SW2 as a filter. It also equipped with direct  adjust of sound on Potentiometer 10k , but only useful as a master volume.
Minimum Voltage  : 8 volts
Maximum Voltage : 18 volts
Maximum Power   : 2 X 13 Watt stereo
Impedance Power  : 4 Ohms

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