jet-city_jca20h_sch 电路图.pdf

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1、12345678 A B C D 87654321 D C B A JCA20H BLOCK DIAGRAM JCA20H Block Diagram Titel Size A3 Model No: JCA20H Revision VER090603 Date:9-Dec-2009 Sheet1of 1 File: JCA20H Blo ckDiagram0603.SchDrawn By: Jian Li S SS R RS T TSINPUT 7 8 4 56 9 13 2 V1A 12AX7WA 1 R30 100K 1 R28 220K C26 223 1 R52 1M 31 2 PRE

2、 AMP 1M 1 R25 2.2K C23 471-2kv 1 R32 1M 7 8 4 56 9 13 2 V3A 12AX7WA C15 1UF 1 R43 1k8 1 R44 100K 7 8 4 56 9 13 2 V4A 12AX7WA 1 R20 100K 31 2 VOLUME 1M C7 223 C6 0.1 1 R46 82K 1 R9 100K C11 223 C5 223 1 R48 2.2K 1 R47 220k 1 R6 2.2K 1 R8 220k 2 3 7 9 4 5 V6 EL84 2 3 7 9 4 5 V5 EL84 1 R7 470 -2w 1 R5

3、470-2w C1 0.1 31 2 PRESENCE 25K C12 121 T2 red blue brownblack LOW Feedback R7 DC1 VR1 VR2 EQ? ? ? OUTPUT RadioFans.CN 收音机爱好者资料库 1234 A B C D 4321 D C B A Title NumberRevisionSize A4 Date:3-Dec-2009Sheet 1 of 2 File:JET CITY 20-PREAMP CIRCUITSDrawn By: Jian Li INPUT R27 68K R26 1M R29 1.8K R25 2.2K

4、C27 1mF 6 1 8 3 72 V1 R28 220K R30 100K C26 .02mf C24 0.2mF C28 22mF/450V R31 10k R53 1M VR6 1M C23 470P R32 1M R33 330k R36 220k 6 1 8 3 72 V1 R44 100k R43 1.8K R20 100K C15 1mf C8 470P C10 .02mf C9 .02mf R21 47K R14 470K R13 220 VR3 250K VR4 25K VR5 1M VR2 1M TO PHASE INVERTER A MASTER VOLUME TREB

5、LE BASS MIDDLE C29 47mF/50V PREAMP GAIN RadioFans.CN 收音机爱好者资料库 1234 A B C D 4321 D C B A Title NumberRevisionSize A4 Date:3-Dec-2009Sheet 2 of 2 File: JET CITY 20-PREAMP CIRCUITSDrawn By: Jian Li F1 F2 T1 PT 2A POWER L G N STANDBY V1V2V3V4V5 PILOT LAMP R10 100/1W R11 100/1W D2D3 D4D5 R4 220K/2W C4

6、47UF/450V C3 22UF/450V C14 22UF/450V R3 1K/2W R45 10K/2W FROM PREAMP A 1 6 27 8 3 V3C7 .02mf C12 120P R46 82K R9 100K R19 1M R18 470 R17 1M R16 10k R15 4.7k C6 .1mf C1 .1mf VR1 25K R12 47k C11.02mf C5 .02mf D1 R47 220K R8 220K R48 2.2K R6 2.2K R7 470/2W R5 470/2W V4 V5 R1 10k R2 10k C2 22uf/100v Q1 50k T2 SPEAKERS 16 OHMS 8 OHMS PRESENCE BIAS ADJUST R49 0 R R50 0 R TO PHASE INVERTERA U_JET CITY 20-PREAMP CIRCUITS JET CITY 20-PREAMP CIRCUITS.SchDoc RadioFans.CN 收音机爱好者资料库