About the article

DMX Dimmer

for semi-professional applications

DMX Dimmer
Using a digital DMX signal, a 0-10 V control voltage or manual control, this dimmer can individually set the brightness of up to four spotlights, each of which may present a load of up to 1 kW.The DMX Dimmer described in this article is aimed at the semi-professional application area. It is operated using a light-mixing panel (digital DMX or analogue). It can dim lights (and it does this in an outstanding manner), but it intentionally lacks non-essential frills such as a built-in running-light display or sound-to-light control. Instead, it features optional lamp preheating (with an adjustable range of 0-100% brightness) for gentle lamp operation and it can be used in stand-alone mode, at a fixed dimming level, without a light-mixing panel.
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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
(all SMD devices are size 0805)
R1,R4,R10 = 47Ohm
R2,R5,R11 = 1k0Ohm
R3,R6,R12 = 100Ohm
R7 = not fitted
R8,R13,R14,R15,R44,R45 = 4kOhm 7 SMD
R9 = 4MOhm 7 SMD
R16,R17,R18 = 270Ohm SMD
R19,R20 = 7kOhm 5 SMD
R21 = 1kOhm SMD
R22,R28-R33 = 47kOhm SMD
R23,R24,R25 = 10kOhm SMD
R26,R27 = 120Ohm SMD
R34,R35 = 12V Varistor K14/12
R36...R38 = 270Ohm
R39...R41 = 10kOhm
R42 = 8-way 10kOhm SIL array
R43 = 10Ohm SMD
R46 = 6-way 47kOhm SIL array
C1,C7 = 22pF SMD
C2 = 1µF 16V radial
C3,C4,C22 = 100nF 250VAC, Class X2
C5,C6,C9.-C14,C17,C18 = 33nF SMD
C8,C19 = 470pF SMD
C15 = 100nF SMD
C16 = 1000µF 35V radial
C20 = 4µF7 16V radial
C21 = 220nF 250VAC Class X2
B1 = B40C800 bridge rectifier, round case (40V piv, 800mA)
D1,D15 = 1N4004
D2,D9 = LL4148
D10,D11 = BAS40
D3-D8 = BAV99
D12,D13,D14 = LED
IC1 = 68HC11F1FN, programmed, order code 010210-41*
IC2 = 7805
IC3 = LTC485 CN8
IC4 = LM358N
IC5,IC6,IC7 = MOC3020
T1-T6 = BC847
F1 = fuse, 100mA, slow, with PCB mount holder and protective cap
F2 = 100°C thermal fuse (Conrad Electronics #534137)
F3 = 170mA Polyswitch (Conrad Electronics #551198)
F4,F5,F6 = fuse, 6.3A, slow, with PCB mount holder and protective cap
K1 = 3-way PCB terminal block, lead pitch 7.5mm
K3 = 3-way pinheader
K2,K4 = 8-way pinheader
K5 = 10-way pinheader
K6,K7,K8 = 13A panel mounting socket to BS1363
K9= 5-way pinheader
L1,L2,L3 = toroid suppressor coil, 1.3mH, 4.5A (Conrad Electronics #534366)
TR1 = Mains transformer, 15V, 3.2VA
TRi1,Tri2,TRI3 = BTA26-600A (isolated case!), 600V, 25A, 100mA drive current
X1 = 16MHz quartz crystal
68-way PLCC socket
PCB, order code 010210-1
K10 = 8-way DIN socket, chassis mount
K11 = 5-way XLR plug (male), chassis mount
K12 = 5-way XLR socket (female), chassis mount
D15,D16,D17 =
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