Active Crossover for Active Loudspeakers
With steep 3-way filters
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.
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Extra info / Update
Balanced input: 0.25’ inch phone jack or XLR connector
Typical input signal level: 0.5–1 Vrms (line level)
Input impedance: 100 kOhm
THD + noise per channel (BW = 22 kHz):
Bass: 0.0003% at 100 Hz
Midrange: 0.0003% at 2 kHz
Treble: 0.0005% at 7 kHz
Supply voltage: ±16 to ±25 V
Current consumption: 65 mA typical
Components
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
All 1% = metal film
R1,R2,R5,R6,R49,R50 = 1kOhm 5%
R3,R4,R32,R33= 100kOhm 5 %
R7,R14,R21,R36,R47 = optional *
R8..R13,R22,R29,R31,R37,R39–R43,R46* = 3kOhm 1%
R15,R17 = 4.7kOhm 1%
R16,R18,R24,R25,R26,R27 = 2.26kOhm 1%
R19,R51 = 3.3kOhm 5%
R20,R35,R45 = 10kOhm 5%
R23,R38,R48 = 100Ohm 5%
R28,R30 = 6.2kOhm 1%
R34,R44 = 180kOhm 5%
P1,P2,P3 = 20kOhm preset, horizontal *
Capacitors
C1,C4,C5,C6,C27–C30 = optional *
C2,C3 = 1µF 63V, PET, 2.5 or 5mm pitch
C7–C16 = 10nF 5%, PET, 5 or 7.5mm pitch *
C17–.C26 = 47nF, 5%, PET, 5 or 7.5mm pitch *
C31–.C44,C52,C53 = 100nF, X7R, 5mm pitch *
C45–C51,C54,C55 = 22µF, 63V, radial, 7mm diam., 2.5mm pitch
Semiconductors
D1–D4 = 1N4148
D5,D6 = 1N4001
LED1,LED2 = LED, green, 3mm
IC1–IC7 = NE5532A, DIL case
IC8 = 7812
IC9 = 7912
Miscellaneous
K1 = 3-way XLR, 6.3mm, socket, Neutrik NCJ6FA-H
K2,K3,K4 = 2-way PCB screw terminal block, 0.2’’ pitch
K5 = 4-way PCB screw terminal block, 0.2’’ pitch
Thermal insulation washer and collar for IC9
Platine 140571-1 *
* see text
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