RIAA Preamp with FETs
SRPP equaliser for moving magnet (MM) cartridges
Materials
Gerber file
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Component list
R1,R3,R11,R13,R15,R23 = 47kOhm
R2,R4,R14,R16 = 100Ohm
R5,R17 = 12kOhm1
R6,R18 = 1kOhm33
R7,R19 = 68kOhm
R8,R20 = 470Ohm
R9,R21,R27 = 10kOhm
R10,R22 = 220kOhm
R12,R24 = 15kOhm
R25 = 274Ohm
R26 = 4kOhm87
R28 = 22Ohm
P1,P3 = 250Ohm preset
P2,P4 = 1kOhm preset
Capacitors:
C1,C9 = 27pF
C2,C3,C6,C10,C11,C14 = 1µF MKT, lead pitch 7.5mm
C4,C12 = 220nF
C5,C13 = 82nF
C7,C15,C17,C20 = 100nF
C8,C16 = 100µF 40V radial
C18,C19 = 10µF 63V radial
C21 = 1000µF 63V radial
C22-C25 = 47nF ceramic, lead pitch 5mm
C26,C27 = 100nF 250 VAC (Class X2), lead pitch 15mm
Inductors:
L1 = suppressor choke 2 x 27mH (Epcos # B82721-K2401-N21)
Semiconductors:
B1 = B80C1500 bridge rectifier, rectangular case (80V piv, 1.5 A)
D1 = LED, low current
T1,T2,T6 = 2SK389-BL (Toshiba), (www.reichelt.de)
T3,T4,T7,T8 = BF245B (see text)
T5,T9 = BC550C
IC1 = LM317 (TO220 case)
Miscellaneous:
K1-K4 = cinch socket, PCB mount (Monacor/Monarch # T-709G)
K5 = 2-way PCB terminal block, lead pitch 7.5m
TR1 = mains transformer, 2 x 12V / 1.8VA (e.g. Gerth # 304.24-2)
PCB, available from The PCBShop.
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