Article
Supra 2.0
A super low-noise MM/MD phono preamp
Vinyl is back with a vengeance among hi-fi enthusiasts. The sound of vinyl records is something very special and cannot be compared to the sound of digital audio sources. In this article we present a high-end phono preamplifier featuring four special opamps wired in parallel in each channel to achieve extremely low noise. We used this approach earlier in a design published back in 1982, with discrete transistors at that time.
Gerber file
CAM/CAD data for the PCB referred to in this article is available as a Gerber file. Elektor GREEN and GOLD members can exclusively download these files for free as part of their membership. Gerber files allow a PCB to be produced on an appropriate device available locally, or through an online PCB manufacturing service.
Elektor recommends the Elektor PCB Service service from its business partner Eurocircuits or AISLER as the best services for its own prototypes and volume production.
The use of our Gerber files is provided under a modified Creative Commons license. Creative Commons offers authors, scientists, educators and other creatives the freedom to handle their copyright in a more free way without losing their ownership.
PCB
Component list
Component List
Preamplifier board
Resistors
R1,R30 = 47kOhm, 1%, 0.6 W, metal film
R2,R3,R31,R32 = 10MOhm, 5%, 0.25W, carbon film
R4,R6,R7,R9,R10,R12,R13,R15,R27,R33,R35,R36,R38,R39,R41,R42,R44,R56 = 47Ohm, 1%, 0.5W, metal film
R5,R8,R11,R14,R34,R37,R40,R43 = 2.2kOhm, 1%, 0.6W, metal film
R16–R19,R45–R48 = 6.81kOhm, 1%, 0.6W, metal film
R20,R49 = 110Ohm, 1%, 0.6W, metal film
R21,R50 = 1.6kOhm, 1%, 0.6W, metal film
R22,R51 = 5.1kOhm, 1%, 0.6W, metal film
R23,R52 = 470Ohm, 1%, 0.6W, metal film
R24,R53 = 62kOhm, 1%, 0.6W, metal film
R25,R54 = 4.7kOhm, 1%, 0.6W, metal film
R26,R55 = 7.5kOhm, 1%, 0.6W, metal film
R28,R29,R57,R58 = 1kOhm, 1%, 0.6W, metal film
R59,R61 = 180Ohm, 1%, 0.6W, metal film
R60,R62 = 2.0kOhm, 1%, 0.6W, metal film
R63 = 10kOhm, 5%, 0.25W, carbon film
P1,P2 = 1MOhm, 20%, 0.15W trimpot, vertical mounting
Capacitors
C1',C26' = nor fitted, see text
C1,C26 = 100pF 160V, 2.5%, axial, polystyrene, max. 12.9 x 5mm
(match C1 and C26 to element in use)
C2,C27 = 220nF 100V, 10%, lead pitch 5 or 7.5mm
C3,C6,C9,C12,C28,C31,C34,C37 = 470pF 160V, 2,5%, axial, polystyrene, max. 12.9 x 5mm, lead pitch 5, 7.5, 10, or 14.6mm
C4,C5,C7,C8,C10,C11,C13,C14,C20,C21,C29,C30,C32,C33,C35,C36,C38,C39,C45,C46 = 100nF 50V, 10%, X7R, 0.2’’ or 0.34’’ lead pitch
C15–C18,C40–C43 = 22nF 63V, 1%, axial, polystyrene, max. 17 x 6,5mm, lead pitch 5, 7.5, 10, 14.6, or 19mm
C19,C44 = 2.1µF 420 V, 10%, polypropylene, lead pitch 5, 7.5, 10, 15, 22.5, or 27.5mm
C22,C24,C47,C49,C51,C52,C53,C56,C59,C61 = 100nF 50V, 10%, X7R, 0.2’’ lead pitch
C23,C25,C48,C50 = 100µF 50 V, 20%, diam. max. 8mm, lead pitch 2.5 or 3.5mm
C54,C55,C57,C58 = 10µF/50V, 20%, diam. 6.3mm max., 0.1’’ lead pitch
C60,C62 = 220µF 50V, 20%, 10mm diam. max., 0.2’’ lead pitch
C63–C66 = 10nF 50V, 20%, Y5V, 0.2’’ lead pitch
Inductor
L1 = SU9V-01100, common-mode-choke 2x10mH, 100mA
Semiconductors
D1,D2,D3,D4 = 1N4007, DO-41
LED1 = high-intensity LED, blue, 3mm, T-1
T1,T3 = BC337-25, TO-92 case
T2,T4 = BC327-25, TO-92 case
IC1..IC4,IC6..IC9 = LT1028CN8, DIP-8 case
IC5,IC10 = LM833NG, DIP-8 case
IC11 = LM317, TO-220 case
IC12 = LM337, TO220 case
Miscellaneous
K1–K4 = solder pin, 1.3mm diam.
K5 = 3-way PCB screw terminal, 0.2’’ lead pitch
JP1,JP2 = 2-pin pinheader, 0.1’’ pitch
JP1,JP2 = jumper for pinheader
Enclosure, Hammond type 1455N1602
2 pcs Neutrik NYS367-0 cinch socket for panel mounting, black
2 pcs Neutrik NYS367-2 cinch socket for panel mounting, red
PCB # 150616-1
or
Component List
Analog Power Supply
Capacitors
C1,C2 = 100nF 1kV, X1, polypropylene, 10, 12.5, or 15mm lead pitch
Inductor
L1 = B82724J2142N1 common-mode choke, 2x27mH, 1.4A
Miscellaneous
F1,F2,F3 = fuseholder for PCB mounting, 20x5mm, 500V, 10A
F1,F2,F3 = cap for fuseholder, 20x5mm
F1 = 100mAT (slow-blow) glass fuse, 20x5mm
F2,F3 = 160mAT (slow-blow) glass fuse, 20x5mm
K1 = 2-way PCB screw terminal block, 0.3’’ pitch, 500V
K2 = 4-way (2x2) PCB screw terminal block, 0.2’’ pitch
TR1 = 6VA power transformer, 2x115V primary, 2x18V/166mA secondary, e.g. Block FL6/18
JP1,JP2 = wire link, see text
PCB # 150616-2
Component List
Modular Supply
Resistors
R1 = 4.7kOhm, 5%, 0.25W
Capacitors
C1–C6 = 2.2µF 50V, 20%, ceramic Y5V, 0.2’’ pitch
C10,C11 = 47µF 50V, 20%, 2.5mm pitch, diam. 6.3mm max.
C12,C13 = 100nF 50V, 10%, ceramic X7R, 0.2’’ pitch
Inductors
L1 = 4.7µH, 3.05A, 80mOhm, 10%, radial, 5mm pitch, e.g. Epcos B82144B2472K000
L2 = 600µH, 2A, 2x50mOhm, common-mode choke, 17.5x14mm, e.g. Kemet SC-02-06G
Semiconductors
D1,D4,D5 = 1N4007
LED1 = LED, green, 3mm
MOD2 = JCE0612D24 XP Power (6W ±24V)
Miscellaneous
K2 = 2-way PCB screw terminal block, 0.2’’ pitch
K4 = 3-way PCB screw terminal block, 0.2’’ pitch
F1 = fuseholder for PCB mounting, 20x5mm, 500V/10A
F1 = cap for fuseholder, 20x5 mm
F1 = 1 AT (slow-blow) glass fuse, 20x5mm
2 wire links!
PCB #150464-1
Preamplifier board
Resistors
R1,R30 = 47kOhm, 1%, 0.6 W, metal film
R2,R3,R31,R32 = 10MOhm, 5%, 0.25W, carbon film
R4,R6,R7,R9,R10,R12,R13,R15,R27,R33,R35,R36,R38,R39,R41,R42,R44,R56 = 47Ohm, 1%, 0.5W, metal film
R5,R8,R11,R14,R34,R37,R40,R43 = 2.2kOhm, 1%, 0.6W, metal film
R16–R19,R45–R48 = 6.81kOhm, 1%, 0.6W, metal film
R20,R49 = 110Ohm, 1%, 0.6W, metal film
R21,R50 = 1.6kOhm, 1%, 0.6W, metal film
R22,R51 = 5.1kOhm, 1%, 0.6W, metal film
R23,R52 = 470Ohm, 1%, 0.6W, metal film
R24,R53 = 62kOhm, 1%, 0.6W, metal film
R25,R54 = 4.7kOhm, 1%, 0.6W, metal film
R26,R55 = 7.5kOhm, 1%, 0.6W, metal film
R28,R29,R57,R58 = 1kOhm, 1%, 0.6W, metal film
R59,R61 = 180Ohm, 1%, 0.6W, metal film
R60,R62 = 2.0kOhm, 1%, 0.6W, metal film
R63 = 10kOhm, 5%, 0.25W, carbon film
P1,P2 = 1MOhm, 20%, 0.15W trimpot, vertical mounting
Capacitors
C1',C26' = nor fitted, see text
C1,C26 = 100pF 160V, 2.5%, axial, polystyrene, max. 12.9 x 5mm
(match C1 and C26 to element in use)
C2,C27 = 220nF 100V, 10%, lead pitch 5 or 7.5mm
C3,C6,C9,C12,C28,C31,C34,C37 = 470pF 160V, 2,5%, axial, polystyrene, max. 12.9 x 5mm, lead pitch 5, 7.5, 10, or 14.6mm
C4,C5,C7,C8,C10,C11,C13,C14,C20,C21,C29,C30,C32,C33,C35,C36,C38,C39,C45,C46 = 100nF 50V, 10%, X7R, 0.2’’ or 0.34’’ lead pitch
C15–C18,C40–C43 = 22nF 63V, 1%, axial, polystyrene, max. 17 x 6,5mm, lead pitch 5, 7.5, 10, 14.6, or 19mm
C19,C44 = 2.1µF 420 V, 10%, polypropylene, lead pitch 5, 7.5, 10, 15, 22.5, or 27.5mm
C22,C24,C47,C49,C51,C52,C53,C56,C59,C61 = 100nF 50V, 10%, X7R, 0.2’’ lead pitch
C23,C25,C48,C50 = 100µF 50 V, 20%, diam. max. 8mm, lead pitch 2.5 or 3.5mm
C54,C55,C57,C58 = 10µF/50V, 20%, diam. 6.3mm max., 0.1’’ lead pitch
C60,C62 = 220µF 50V, 20%, 10mm diam. max., 0.2’’ lead pitch
C63–C66 = 10nF 50V, 20%, Y5V, 0.2’’ lead pitch
Inductor
L1 = SU9V-01100, common-mode-choke 2x10mH, 100mA
Semiconductors
D1,D2,D3,D4 = 1N4007, DO-41
LED1 = high-intensity LED, blue, 3mm, T-1
T1,T3 = BC337-25, TO-92 case
T2,T4 = BC327-25, TO-92 case
IC1..IC4,IC6..IC9 = LT1028CN8, DIP-8 case
IC5,IC10 = LM833NG, DIP-8 case
IC11 = LM317, TO-220 case
IC12 = LM337, TO220 case
Miscellaneous
K1–K4 = solder pin, 1.3mm diam.
K5 = 3-way PCB screw terminal, 0.2’’ lead pitch
JP1,JP2 = 2-pin pinheader, 0.1’’ pitch
JP1,JP2 = jumper for pinheader
Enclosure, Hammond type 1455N1602
2 pcs Neutrik NYS367-0 cinch socket for panel mounting, black
2 pcs Neutrik NYS367-2 cinch socket for panel mounting, red
PCB # 150616-1
or
Component List
Analog Power Supply
Capacitors
C1,C2 = 100nF 1kV, X1, polypropylene, 10, 12.5, or 15mm lead pitch
Inductor
L1 = B82724J2142N1 common-mode choke, 2x27mH, 1.4A
Miscellaneous
F1,F2,F3 = fuseholder for PCB mounting, 20x5mm, 500V, 10A
F1,F2,F3 = cap for fuseholder, 20x5mm
F1 = 100mAT (slow-blow) glass fuse, 20x5mm
F2,F3 = 160mAT (slow-blow) glass fuse, 20x5mm
K1 = 2-way PCB screw terminal block, 0.3’’ pitch, 500V
K2 = 4-way (2x2) PCB screw terminal block, 0.2’’ pitch
TR1 = 6VA power transformer, 2x115V primary, 2x18V/166mA secondary, e.g. Block FL6/18
JP1,JP2 = wire link, see text
PCB # 150616-2
Component List
Modular Supply
Resistors
R1 = 4.7kOhm, 5%, 0.25W
Capacitors
C1–C6 = 2.2µF 50V, 20%, ceramic Y5V, 0.2’’ pitch
C10,C11 = 47µF 50V, 20%, 2.5mm pitch, diam. 6.3mm max.
C12,C13 = 100nF 50V, 10%, ceramic X7R, 0.2’’ pitch
Inductors
L1 = 4.7µH, 3.05A, 80mOhm, 10%, radial, 5mm pitch, e.g. Epcos B82144B2472K000
L2 = 600µH, 2A, 2x50mOhm, common-mode choke, 17.5x14mm, e.g. Kemet SC-02-06G
Semiconductors
D1,D4,D5 = 1N4007
LED1 = LED, green, 3mm
MOD2 = JCE0612D24 XP Power (6W ±24V)
Miscellaneous
K2 = 2-way PCB screw terminal block, 0.2’’ pitch
K4 = 3-way PCB screw terminal block, 0.2’’ pitch
F1 = fuseholder for PCB mounting, 20x5mm, 500V/10A
F1 = cap for fuseholder, 20x5 mm
F1 = 1 AT (slow-blow) glass fuse, 20x5mm
2 wire links!
PCB #150464-1
Discussion (0 comments)
Steve Morgan 5 months ago
Dr. Thomas Scherer 5 months ago
Just tried it. it worked.
Dr. Thomas Scherer 5 months ago
I just tried it. It worked...
Dr. Thomas Scherer 5 months ago
Steve Morgan 5 months ago
Dr. Thomas Scherer 5 months ago
https://www.elektormagazine.com/magazine/download-file-58980/?file=150616-2%20transformer_pcb_gerber_v100.zip
both are working with my PC (which is a mac)
Steph van Schalkwyk 3 months ago
Is there an errata or are these fine to have a batch made? I'm having 10 made as it is about $5 more than having 5 made.
Regards
S
Dr. Thomas Scherer 3 months ago