Preamp mic schematic and Audio Megaphone using BC547, TDA7052
Preamp mic schematic and Audio Megaphone
P1_____________22K
R1_____________22K
R2,R3_________ 100K
R4_____________47K
R5______________2K2
R6______________6K8
R7_____________22K
R8______________2K7
C1,C6_________ 100nF 63V
C2,C3__________10µF 63V
C4_____________22µF 25V
C5_____________22nF 63V
C7____________ 470µF 25V
Q1_ BC547
IC1 TDA7052
SW1____________SPST
MIC____________electret microphone
SPKR___________8 Ohm Loudspeaker
