QUAD 34 MC Disc input mods 电路图.pdf

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1、2SA1085E T1 + C12 15u 3.9k R5 R22 1k1 2SA1085E T3 2SC2547E T4 R24 1k1 22n C2 Right R2 100R 1 2 3 4 5 6 7 8 HD1 R6 3.9k Left T2 2SC2547E + 15u C13 100R R1 C1 22n + 15u C14 2SA1085E T1 3.9k R5 R22 1k1 2SA1085E T3 2SC2547E T4 R24 1k1 Right 1 2 3 4 5 6 7 8 HD4 R6 3.9k Left T2 2SC2547E 100R R1 C1 22n 2SA

2、1085E T1 3.9k R5 R22 1k1 2SA1085E T3 2SC2547E T4 R24 1k1 22n C2 Right 100R R2 1 2 3 4 5 6 7 8 HD3 R6 3.9k Left T2 2SC2547E 100R R1 C1 22n 3.9k R9 3.9k R10 R23 30R + C15 15u R9 3.9k R10 3.9k R9 3.9k 3.9k R10 100R R2 22n C2 6.8R R23 6.8R R21 + 47u C13 + 47u C12 +47u C15 + 47u C14 + C14 22u + C15 22u +

3、 C12 22u + C13 22u 15R R23 15R R21 R21 30R 1 d.c. daylight ltd. 5 Greenacre Drive Pontprennau Cardiff CF23 8PA Revision: Page of Page Size: Tel: +44 29 20 657149 Checked:Fax: +44 29 20 657151Drawn: K. Snook d.c. daylight ltd. QUAD 34 RIAA MC modifications A4 June 200711 +ve -ve +ve -Ve-Ve +ve -ve +v

4、e -Ve +ve -ve +ve 400uV200uV100uV QUAD 34 Moving Coil Disc modules modification to use 2SC2547E and 2SA1085E low noise transistors operating at 1mA collector current to give lowest noise at low impedance source. Note on the main PCB C18 and C22 may be bypassed with 330nF-510nF or changed for values in the range 2.2uF to 3.3uF to fine adjust the low frequency response. RadioFans.CN 收音机爱 好者资料库