About the article

Single-Chip Tone Control

For use with the multimedia loudspeaker system

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.

Elektor recommends its business partner Eurocircuits as the company of choice for its own prototypes and volume production in selected cases.

Component list
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)
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
B1 = B80C1500 in rectangular case (80V piv, 1.5A) (~+~–)
D1 = LED, high-efficiency
IC1 = LM1036N (National Semiconductor)
IC2 = LM317 (TO-220 case)
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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