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This is Low power amplifier , based on IC TDA2824 product of Philips. Maximum output is about 2 X 1,8 Watt , these include low  output amplifier type. Minimum required voltage 3 Volts and maximum voltage of 18 volts DC. Specification : Supply Voltage : 3 - 18 Volts Power Output   : 2 x 1,3 Watts RL impedance  : 4 Ohms Frequency responses : 30Hz -18kHz Quiescent current : 6 mA                

TDA1009 circuit amplifier , this circuit is stereo amplifier and simple schematic .Minimum voltage require 9V and maximum voltage 24V. To avoid damaged IC please use supply voltage 12 volt and must be filtering voltage. Power output 2 X 18 W with impedance 4 Ohm.See circuit schematic and troubleshooting amplifier : Click to view larger  If circuit not working ,possible cause is on : Supply voltage. Components damaged , such as IC , resistor ,and Capacitor. Installation components inverted. Broken line PCB. Input not connected. Or input grounding. Output Not connected. Speakers damaged.