• on Audio/Video/Photography
  • Published in issue 9/2004 on page 0
About the article

ClariTy 2x300W Class-T Amplifier, Part 2

building the amplifier board

ClariTy 2x300W Class-T Amplifier, Part 2
A pulse-width-modulated output stage with hi-fi characteristics is something rather special. We already described various aspects of this design in the June 2004 issue. Following that introduction, in this instalment we continue with a description of how to build this powerhouse.The pulse-width modulated amplifier we’re talking about here is based on the Tripath TA3020 driver IC. The term ‘pulse-width modulated’ may call up negative associations, but they are fully out of place here. The specifications are outstanding, and the amplifier is certainly as good as quite a few models in the upper end of the commercial range.To make construction as easy as possible for Elektor Electronics readers, we can supply the printed circuit board for this project with all of the SMD components already nicely soldered in place, all at a very attractive price. And don’t forget that a single circuit board houses a complete 2 ¥ 300-W stereo amplifier.
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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.

Pre-fitted SMD parts not listed. If necessary the list of pre-fitted parts may be downloaded from our website. Suggested suppliers are mentioned with unusual components only. These suppliers are not exclusive.
Resistors:
R6,R11,R27,R32 = 0Ohm 01, lead pitch 9mm, MPC75-E01 (H.O.D1 , Bürklin2)
R7,R9,R28,R30 = 5Ohm 6/1 W lead pitch 15mm (max.), PR01 BCComponents (Farnell # 337-584, 10+)
R12,R33 = 15Ohm 1W, PR01, BCComponents (Farnell # 337-638, 10+)
R13,R34 = 240Ohm
R14,R35 = 22Ohm 5W (vertical))
P1,P2 = 10kOhm preset
Capacitors:
C1,C14 = 3µ F3 50V, MKT, lead pitch 5mm or 7.5 mm
C4,C17 = 220pF 200 V, COG, lead pitch 5 mm, dipped radial multilayer ceramic, Multicomp (Farnell # 747-075, 1+)
C5,C18,C32,C33,C36,C37 = 100nF 250V, lead pitch 7.5mm or 10mm, w x l = 6 x 13 mm (max.), Wima MKS4 (Farnell # 148-888, 1+)
C6,C19 = 47µ F 160V radial, lead pitch 5mm, diameter 10mm (max.), 105ºC, Panasonic EEUED2C470 (Farnell # 83-6400, 1+)
C8,C21,C38 = 47µ F 25V radial
C9,C22 = 220nF 400V MKP, lead pitch 15mm, w x l = 8.5 x 18 mm (max.), Epcos B32652-A4224-J (Farnell # 400-3755, 1+)
C10,C23 = 100nF 400V MKP, lead pitch 15mm, w x l = 7 x 18 mm (max.), Epcos B32652-A4104-J (Farnell # 400-3731, 1+)
C30,C31,C34,C35 = 470µ F 63V radial, lead pitch 5mm, diameter 13 mm (max.), 105ºC, Nichicon UPM1J471MHH (Farnell # 415-3030, 5+)
Inductors:
L1,L2 = 11µ H3, 29 turns 1.5 mm ECW (SWG 16) on T106-2 core (Micrometals) (core supplied with pre-fitted PCB)
Semiconductors:
D1-D4,D8-D11 = MUR120 1 A/200 V ultra fast, ON Semiconductor (Farnell # 930-994, 1+)
D15 = LED, red, high efficiency
T1-T4 = STW38NB20, TO-247 case, 200 V/38 A, ST (Farnell # 323-9408, 1+)
IC1 = TA3020, Tripath3
IC2 = CNY17-2
Miscellaneous:
JP1,JP2 = 3-way pinheader with jumper
K1-K4,K6-K9 = spade terminal, vertical, PCB mount
K5 = 2-way PCB terminal block, lead pitch 5 mm
K10 = 2-way pinheader
48-pin IC socket, DIP socket with turned pins
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