DMX Dimmer
for semi-professional applications
Published in issue 310, May 2002
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.
(all SMD devices are size 0805)
Resistors:
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
Capacitors:
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
Semiconductors:
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
Miscellaneous:
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
Ancillaries
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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Click below to download a PDF copy of this article from Elektor magazine. Please note. In view of the complexity of international markets, Elektor cannot guarantee the availability of components for this project.
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