• on Audio/Video/Photography
  • Published in issue 3/2005 on page 0
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High-end Power Amp

High-class watts

High-end Power Amp

The High-End Preamp preamplifier published in the April & May 2004 issues naturally calls for a matching final amplifier in an identical housing. Due to the restricted size of the enclosure, the output power of this final amplifier is somewhat on the modest side, but the quality is outstanding – and it is more than adequate for filling an average living room with an impressive sound image.

The Audio Link amplifier, published a year ago, was well received by audio enthusiasts due to its very convenient user interface and high-quality, no-nonsense signal processing A matching final amplifier must naturally have the same level of quality, and here we have made an extra effort to achieve this result.

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Gerber file

CAM/CAD data for the PCB referred to in this article is available as a Gerber file. Elektor 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 its business partner Eurocircuits as the company of choice for its own prototypes and volume production in selected cases.

Power supply board (040198-1)
Resistors:
R1,R17,R19 = 470Ohm
R2 = 10kOhm
R3-R6 = 33Ohm
R7,R8,R10,R11 = 820Ohm
R9,R12 = 15Ohm
R13,R15,R40 = 1kOhm
R14,R16 = 270Ohm
R18,R26,R27 = 4kOhm7
R20,R23,R32,R33 = 22Ohm
R21,R22,R24,R25 = 10Ohm
R28 = 560Ohm
R29 = 120Ohm
R30,R31,R45 = 1Ohm
R34,R35 = 0Ohm22 MPC71
R36 = 2Ohm2, 1W (e.g. Farnell # 306-0408)
R37–R39 = 100kOhm
R41 = 10MOhm
R42,R48 = 330kOhm
R43,R44,R46,R47 = 1MOhm
P1 = 250Ohm preset
Capacitors:
C1 = 1nF
C2,C3 = 2nF2
C4,C7,C11,C12,C14 = 100nF
C5,C8,C13,C15 = 3300µF 35V, radial, lead pitch 7.5mm, diam. 18mm max. (e.g. Farnell # 303-6467)
C6,C9,C19 = 470nF
C10 = 15pF
C16,C17 = 47µF 25V, radial
C18 = 10µF 63V, radial
C20 = 2µF2 MKT, lead pitch 5mm or 7.5mm
Inductors:
L1 = 8 turns 1.5-mm diam. (SWG30) enamelled copper wire, inside diam. 10mm
Semiconductors:
D1-D4,D11-D13 = 1N4148
D5-D8 = Zener diode, 4V7, 0W5
D9,D10 = LED, flat, red
D14,D15 = Zener diode, 5.6V, 0.5W
T1 = 2SC3381BL (Toshiba, Huijzer, Segor-electronics)
T2 = 2SA1349BL (Toshiba, Huijzer, Segor-electronics)
T3,T7,T8 = 2SA1209 (Sanyo, Farnell # 410-3841)
T4,T9,T10 = 2SC2911 (Sanyo, Farnell # 410-3853) T5,T6 = BF245A
T11,T12 = 2SC5171 (Toshiba, Huijzer, Segor-electronics)
T13 = 2SA1930 (Toshiba, Huijzer, Segor-electronics)
T14 = 2SC5359 (Toshiba, Huijzer, Segor-electronics)
T15 = 2SA1987 (Toshiba, Huijzer, Segor-electronics)
T16,T17 = BC547B
T18 = BS170
IC1 = OPA177GP (Texas Instruments/Burr-Brown, e.g. Farnell # 205-023)
Miscellaneous:
K1-K5 = PCB-mount spade (Faston) terminal, vertical, 2 pins
RE1 = PCB relay 24V, 16A, 1100Ohm e.g. Omron G2R-1-24 VDC)
Heat sink, 1.25 K/W e.g. (Fischer SK411, height 50mm)
Ceramic insulators for T7-T10 (Fischer AOS220)
Mica insulating washers for T14 & T15 (e.g. Conrad Electronics # 189049)
Enclosure: e.g. UC-202H/SW (Monacor/Monarch)

COMPONENTS LIST
Indicator board (040198-2)
Resistors:
R1,R18 = 1MOhm
R2,R19 = 100kOhm
R3,R20 = 1kOhm
R4,R21 = 0Ohm (wire bridge)
R5,R22 = 1kOhm69
R6,R23 = 4kOhm75
R7,R11,R12,R24,R28,R29 = 470Ohm
R8,R25 = 20kOhm0
R9,R26 = 10kOhm0
R10,R13,R27,R30 = 15kOhm
R14,R31 = 270Ohm
R15,R32 = 150Ohm
R16,R17,R33,R34 = 220Ohm 1W PR01 (Vishay BCcomponents, Farnell # 337-778)
P1,P2 = 500Ohm preset
Capacitors:
C1,C12 = 10µF 63V MKT, lead pitch 22.5/27.5mm, W ? L = 11 ? 31mm max.
(e.g. Farnell # 400-2015)
C2,C13 = 470pF
C3,C14 = not fitted
C4,C15 = 15pF
C5,C16 = 22µF 40V, radial
C6–C9,C17–C20 = 100nF
C10,C11,C21,C22 = 470µF 25V, radial
Semiconductors:
D1,D2 = LED, red, low-current, 3mm, 20mcd at 2mA (Kingbright L-934LSRD, Farnell # 637-075)
D3-D6 = Zener diode, 15V 1.3W
T1,T2 = BF245A
IC1,IC3 = AD827JN (Analog Devices, Farnell # 246-165)
IC2,IC4 = LM319N
Miscellaneous:
K1,K2 = cinch socket, PCB mount (e.g. Monacor T-709G)

COMPONENTS LIST
power supply board (040198-3)
Resistors:
R1,R2 = 6kOhm8
Capacitors:
C1-C4,C11-C14 = 47nF ceramic, lead pitch 5mm
C5,C6,C8,C9,C15,C16,C18,C19 = 6800µF 35 V, diam. 25mm, lead pitch 10mm (Farnell # 652-090) C7,C10,C17,C20 = 100nF MKT, lead pitch 5mm or 7.5 mm
Semiconductors:
D1-D4,D6-D9 = Schottky rectifier, 10A, 100V, TO-220AC package (e.g. ON Semiconductor MBR10100, Farnell # 878-443)
D5,D10 = LED, red, low-current
Miscellaneous:
K1-K4 = 3-way PCB terminal block, lead pitch 5mm

COMPONENTS LIST
Fuse board (040198-4)
Miscellaneous:
K1–K3 = 2-way PCB terminal block, lead pitch 7.5 mm
F1,F2 = fuse, 400mAT (time lag), with PCB mount holder
PCBs:
Required for a stereo amplifier:
2 ea. order code 040198-1
1 ea. order code 040198-2
1 ea. order code 040198-3
1 ea. order code 040198-4
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