This is a power mega phone .you can use this to address people in various situation such as when you play in a aground,in a public meeting(small one) etc..so this is so useful one.
Notes.
* The circuit can be powered from a 12V battery or 12V DC power supply.
* The POT R1 can be adjusted to obtain maximum volume with minimum distortion.
* It will be always better to mount the transistors on heat sink.
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