Megaphone small lightweight portable size, 5-watt sound for your use at any time. Neck pain because it does not require voice than usual.
Operation of the circuit. When you press the switch circuit S1 is working but no sound came out. When the audio signal to MIC1, a condenser microphone.
This allows audio signals are converted to electrical signals sent to the VR1.Adjust the force acting on C1 of the input signal that serves to expand the filter before the IC1 LM380.Amplifier IC, the output will come out of Pin 8 of IC1 through the filter C5. Was used to drive the speakers.In addition, the R1 and R4 to forward shielding.