1 1 2 2 3 3 4 4 D D C C B B A A Title Number RevisionSize A4 Date: 2012/7/29 Sheet of File: β β.SchDoc Drawn By: 8 1 4 3 2 1 U1A NE5532P 8 1 4 3 2 1 U3A NE5532P VCC VCC 8 1 4 3 2 1 U2A NE5532P VCC VSS VSS VSS R11 1k R12 33k R2 1k R3 33k R5 10k R8 10k R7 10k GND 1 2 3 4 P2 Header 4 C3 10uf C 3 B2 E 1 Q2 2N2222 R1 1k R13 1k R9 600 VCC VSS D1 Diode R4 820 D2 Diode R10 820 C5 0.1U C4 10U GNDGND C1
1 2 3 4 5 +V CC -VCC U3 LM 1875 2 3 1 8 4 U1A NE5532 2 3 1 8 4U2A NE5532 R11 100K R10 47K R9 1K R1 1K R3 1.8K R12 1.8K R14 8.2K R4 8.2K R13 10K R6 1K R2A 50K C5 2200P 1 1 2 2 W 3 R5A 50K C6 47nF C1 47nF C4 220P -15V +15V 1 1 2 2 W 3R7A 100K C2 1uF C3 220pF R8 10K R15 1K R17 10K R16 33K R19 220 R18 10 C7 0.1uF R20 0.33/2W +V CC -VCC LS 1 SPEAKE R 1 2 3 4 5 +V CC -VCC U4 LM 1875 6 5 7 U1B NE5532 6 5