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Echo Talkback Pcb

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J12 R26 4.7K 1 2 3 PA R23 120K R25 4.7K J4 D1 1N4148 +13.8V 1 J5 1 C1 22u/16v 2 R18 100K R19 100K C32 471 2 ECHO ON/OFF TR2 C945 3 Vout D 2 R24 100 Vin C26 104 1 IC3 78L05 2 POWER- R16 75K 3 R2 220 GND 1 POWER+ IC1A LM358 R22 47K TR1 C945 PO D P5 C30 103 C29 104 D2 12V C2 223 C3 47u/16v R1 100 D3 1N4148 Radio PTT C19 47u/16v AUDIO-IN M65850P 50KA 1 2 3 4 5 6 R12 30K Cancel C14 C12 102 VR2 50K J3 C9 472 C7 223 C28 104 R7 15K C13 103 C11 1u/50v GND2 7 C27 472 C10 471 ECHO LEVEL C IC2 R28 10K R6 150K 6 R4 22K R20 22K * See Remark C14 224 1 C31 472 C21 103 4 C5 1u/50v R27 4.7K VR1 10K 8 C15 104 C25 1u/50v C24 102 9 6 R5 4.7K C22 M104 10 7 C20 104 C6 100u/16v 5 AUDIO I/P 5 14 C R11 3K 4 1 2 3 PTT C49 473 C4 104 J2 * See Remark C8 1UF/25V R15 15K C23 103 11 8 C8 1uF > 0.1uF R17 15K R21 3.3K 12 IC1B LM358 13 R3 22K R14 20K 3 1 2 3 AUDIO O/P 2 J1 R8 10K R10 33 R9 15K C16 M104 C17 0.47u/50v C18 0.47u/50v SET ECHO DELAY 50KB ECHO DELAY B R13 1K C33 104 B R38 1K R41 56R R43 180R EXT Speaker Radio PTT Radio Audio Amp +13.8V AUDIO-IN C40 220UF/16V C45 470P C46 104 A R42 1R C48 104 GND1 D4 1N4148 C38 10UF/16V R35 4K7 R34 GND1 1M 5 7 6 VCC C39 104 GND1 C36 0.22UF/50V OUT GND 4 RELAY IN+ Gain GND1 3 GND1 Filter C47 470UF/16V VCC1 C44 47UF/16V IN- 8 GND1 2 7PIN 7 6 5 4 3 2 1 1 J14 C43 470UF/16V IC4 TA820M R37 4K7 C41 102 R39 10K GND1 J13 1 2 3 GND1 C35 470P R36 1K C37 102 GND1 TR3 2SC945 3PIN GND1 REMARKS: * C8 Changed to 0.1uF E.Cap. * C14 - 224 Deleted Above changes for better performance. GND1 GND1 R40 220R GND1 C42 100UF/16V C34 0.22UF/50V R33 10K A All Right Reserved By Goodwill Telecom Title GND1 GND1 Size Integrated Echo and Talkback Board Number Revision A3 Date: File: 24-Nov-2003 Magnum_EchoTB_SCH_0319_1 Sheet 1 of 1 Drawn By: LYG