• on Audio/Video/Photography
  • Published in issue 3/2014 on page 22
About the article

High-End Amplifier for Active Speakers

Max-out your loudspeakers with this compact amplifier module

High-End Amplifier for Active Speakers
Although active loudspeakers are more complex and more costly than passive loudspeakers, they have clear advantages in terms of audio technology and the resulting sound. To keep the complexity and cost within limits, we have developed a simple power amplifier module. Along with a suitable active crossover, you can install two, three or four of them in a speaker cabinet (depending on whether it is a two-way, three-way or four-way loudspeaker) and power them from a single supply.
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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.

Components
Download the BOM list
The BOM (Bill of Materials) is the technically exhaustive listing of parts and other hardware items used to produce the working and tested prototype of any Elektor Labs project. The BOM file contains deeper information than the Component List published for the same project in Elektor Magazine. If required the BOM gets updated directly by our lab engineers. As a reader, you can download the list here.
Want to learn more about our BOM list? Read the BOM list article for extra information.
Component List
Resistors
Default: 0.25W 1%
R1 = 560Ohm
R2 = 10kOhm
R3,R6,R7,R9,R13,R14,R15 = 100Ohm, .4W
R4,R5 = 68Ohm
R8 = 300Ohm
R10 = 11kOhm
R11,R19 = 1kOhm
R12 = 22kOhm*
R16,R17 = 330Ohm
R18 = 10Ohm 1W 5%
P1 = 200Ohm multiturn, vertical mounting
Capacitors
C1 = 4.7µF 63V, 5/7.5mm pitch
C2 = 1nF 63V 2.5/5mm pitch
C3,C4 = 100nF 100V, X7R, 2.5/5mm pitch
C5 = 100nF 63V, MKT, 2.5/5mm pitch
C6 = 10µF 63V, MKT, 5/7.5/10/15mm pitch
C7 = 100pF 1000V, MKP, 5mm pitch
C8 = 100nF 63V MKT, 2.5/5mm pitch
C9 = 100nF 63VAC, MKT, 2.5/5mm pitch
C10,C11 = 100µF 100V, electrolytic, max. diam. 13.5mm, 5mm pitch
C12 = 220pF 1000V, 5%, MKP, 5mm pitch
Semiconductors
D1,D2 = 1N5402
D3 = 1N4148
T1,T2,T11 = MPSA92
T3,T4,T5 = MPSA42
T6 = BC549C
T7 = MJE350
T8 = MJE340
T9 = 2SK1058
T10 = 2SJ162
Miscellaneous
K1,K2 = 2-way PCB mount screw terminal block, 5mm pitch
RE1 = Relay, RT314024, PCB mount, 24V 1440 Ohm, 1x c/o, 250VAC 16A
K3-K10 = Faston terminal, vertical, 0.2‘‘ pitch
T9,T10 = TO-3P style isolating washer, e.g. Kapton MT Film .15mm
Heatsink, 1.2K/W, e.g. SK 85/75 SA (Fischer Elektronik)
PCB # 130007-1 v1.1*
* see text

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