Electronics Circuit Diagram

A megaphone is a a portable, cone-shaped horn used to amplify a person’s voice towards a targeted direction. An electronic megaphone consists of a microphone, an amplifier and a loudspeaker. The following schematic shows the design of a simple Megaphone Circuit Diagram using LM386 power amplifier. The LM386 gain is internally set to 20 to keep external part count low. Battery operated, the power drain is only 24 milliwatts when operating from a 6 volt supply.

Megaphone Circuit Parts List:

R1 ___ 2.2k
R2 ___ 10 Ohm
R3 ___ 10k
C1 ___ .22
C2 ___ .1
C3 ___ 470
C4 ___ 470
LM396
Speaker 8 Ohm
Microphone
Switch
9V Power Source

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