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Voice echo schematic
- 1. ECHO AUDIOMIC SUR +V VCC VCC +V +V AUDIO LEVEL AM SOUND DELAY ADJ 5VDC GND GND GND INPUT CN2 OUT CN2 OUT + C13 4.7uF/63V + C13 4.7uF/63V + C2 10uF/50V + C2 10uF/50V VCC1 REF2 AGND3 DGND4 OSC_O5 VCO6 CC17 CC08 OP1_OUT 9 OP1_IN 10 OP2_IN 11 OP2_OUT 12 LPF2_IN 13 LPF2_OUT 14 LPF1_OUT 15 LPF1_IN 16 U2 HT8970U2 HT8970 C21 47nF C21 47nF J1 JUMPER J1 JUMPER C24 0.1uF C24 0.1uF R14 12KR14 12K C16 33nF C16 33nF + C8 4.7uF/63V + C8 4.7uF/63V + C5 4.7uF/63V + C5 4.7uF/63V C23 0.1uF C23 0.1uF C22 0.1uF C22 0.1uF R6 15K R6 15K R5 100K R5 100K C19 560pF C19 560pF C1 0.1uF C1 0.1uF PR1 22K PRESETPR1 22K PRESET R8 10KR8 10K + C9 100uF/25V + C9 100uF/25V C7 5600pF C7 5600pF + C4 4.7uF/63V + C4 4.7uF/63V CN3 SUPPLY INPUT CN3 SUPPLY INPUT C25 0.1uF C25 0.1uF R16 10KR16 10K + C12 4.7uF/63V + C12 4.7uF/63V R18 15KR18 15K IN OUT GND U3 78L05 U3 78L05 + C14 10uF/50V + C14 10uF/50V PR3 50K PRESET PR3 50K PRESET R17 2.2KR17 2.2K + C15 10uF/50V + C15 10uF/50V R13 15K R13 15K R19 470E R19 470E C3 0.1uF C3 0.1uF CN1 AUX AUDIO CN1 AUX AUDIO R9 12KR9 12K C10 0.1uF C10 0.1uF R12 1KR12 1K R7 100K R7 100K PR2 22KPRESET PR2 22KPRESET MK1 CONDENSOR MIC MK1 CONDENSOR MIC C18 560pFC18 560pF R2 100K R2 100K 3 2 1 84 - + U1A LM358- + U1A LM358 R3 100KR3 100K R15 15KR15 15K C11 560pFC11 560pF R10 4.7KR10 4.7K C20 47nF C20 47nF R1 10K R1 10K R4 1K R4 1K + C6 1uF/63V + C6 1uF/63V D1 RED LED D1 RED LED CN3 Connector : Supply Input 5 VDC CN1 Connector : Aux Audio Input CN2 Connector : Output PR1 Preset : Input Signal Audio Level Adjust J1 : M - Mic input, A - Aux Audio Input For Echo Mode : Omit : C17 PR3 Preset : Echo Effect Sound Delay Adjust PR2 Preset : Echo Depth Adjust For Surround Mode : Omit : R10, R14 & C13 PR3 Preset : Sound Delay Adjust