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What is Arduino?
Simple 100W Power Amplifier with  TIP142 NPN and TIP147 PNP transistors + PCB
 200W RMS Power Amplifier With 2SC2500 AND 2SA1943 + PCB
40W Stereo 14.4V Car Audio Power Amplifier - IC TDA8560Q + PCB
300W RMS Power Amplifier - 2SC3858 and 2SA1494 Transistors + PCB
Adjustable Power Supply 1.2 to 37V High Current 20A with LM317 and TIP35C + PCB