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Single-Chip Tone Control

For use with the multimedia loudspeaker system

Single-Chip Tone Control
Single-Chip Tone Control
Although our active loudspeaker system was completed with the recently published subwoofer and associated power supply, we have added a little extra for the enthusiast: a compact (standalone) tone/volume/balance control, complete with a stabilised 15 V supply. Our active system must surely rank amongst the most comprehensive of its type.Something like a tone control is of course not essential for use with most PC loudspeakers. But when the multimedia system is used to play back music then this is a useful extra. Besides, publishing this circuit gives us the satisfaction of knowing that our active system is now really complete.
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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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PCB

Component list

Resistors:
R1-R4 = 1k?
R5,R6 = 1M?
R7,R8,R10,R11 = 220?
R9,R12 = 100k?
R13-R16 = 47k?
R17 = 560?
R18 = 6k?04
R19 = 6k?8
P1-P4 = 47k? linear (mono)
Capacitors:
C1,C2 = 1µF MKT, lead pitch 5 or 7.5mm
C3,C4 = 1nF
C5,C6,C12 = 10nF
C7,C8,C23,C24 = 10µF 63V radial
C9,C10 = 390nF
C11 = 47µF 25V radial
C13-C16 = 220nF
C17,C19 = 2µF2 MKT (metallised plastic), lead pitch 5 or 7.5mm
C18,C20 = 100pF
C21 = 100µF 25V radial
C22,C25 = 100nF ceramic
C26 = 470µF 40V radial
C27-C30 = 47nF ceramic
Semiconductors:
B1 = B80C1500 in rectangular case (80V piv, 1.5A) (~+~–)
D1 = LED, high-efficiency
IC1 = LM1036N (National Semiconductor)
IC2 = LM317 (TO-220 case)
Miscellaneous:
K1,K2 = cinch socket, PCB mount, e.g., T-709G (Monacor/Monarch)
K3 = 3.5-mm stereo jack socket, PCB mount
K4 = 2-way PCB terminal block, lead pitch 7.5mm
S1 = switch, 1 changeover contact
F1 = fuse, 32 mA/T (time lag) with
PCB mount holder
TR1 = mains transformer, secondary 2 x 7.5V at 1.8VA (e.g., Gerth type 304.15-2)
PCB, order code 020054-4

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