Basic Megaphone. Yell at kids and others with a "mighty voice".
Left side where 600 ohm resistor is carbon type microphone. PNP transistor is 2n68 or 2n101. Battery is 4 " C" type cells. Speaker ( 45 ohm paging type) is where right side 45 ohm resistor is.
Why three 10 ohm resistors? To fine tune of course. Connect and try for volume and low distortion by series and parallel resistor combinations. Next, move microphone ground between batteries to adjust voltage to get best microphone results.
Switch can be pushbutton if you desire.
Volume control is your voice level loudness talking into carbon microphone. More volume simply talk louder.
