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100W RMS Audio Amplifier IC TDA7294 + PCB
Adjustable Power Supply 1.25v to 57V, 6 Amps with TIP36C + LM317HV + PCB
 100W RMS Power Amplifier With 2 NPN 2SC5200 Transistors At Output + PCB
Simple 3 Transistors Power Amplifier push a 600W RMS Subwoofer + PCB