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Light Mixer Panel

with eight channels

Light Mixer Panel
This highly affordable eight-channel light mixer panel has all of the standard control features plus extras such as a switchable rhythm generator for the control inputs and optical output voltage indicators. Furthermore, the circuit is designed to accommodate extensions, in particular external control signals originating from a PC.A light mixer panel forms the heart of every lighting installation in a theatre, concert hall or discotheque. The days when lighting control was limited to the legendary ‘lights out, spot on’ are far behind us. For some time already, lighting has been regarded as an integral part of the performance. A light mixer panel is just as important for the lighting as an audio mixer panel is for sound. The job of the light mixer panel is to provide the control signals for the various dimmer/lamp combinations; it acts as a sort of ‘user interface’ between the responsible technician and the lighting installation.
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Gerber file

CAM/CAD data for the PCB referred to in this article is available as a Gerber file. Elektor 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.

Extra info, Update
The parts list on page 48 should be modified to read: IC23,IC24 = CNY74-4.
Resistors:
R1 = 231Ohm
R2,R3,R5,R7,R9,R11,R13,R15,R17R19,R21,R23,R25,R27R29,R31R33,R44,R46,R48,R49 = 4kOhm 7
R4,R6,R8,R10,R12,R14,R16,R18,R20,R22,R24,R26,R28,R30,R32,R34 = 100kOhm
R43 = 5kOhm 6
R35-R42,R45,R47 = 10kOhm
P1 = 2kOhm 5 preset
P2..P11 = 10kOhm slide potentiomeyer, linear law, e.g., Radiohm (Conrad Electronics # 44 14 49-60)
P13 = 100kOhm potentiometer
Capacitors:
C1,C2 = 2200µF 25V radial
C3,C4 = 1µF 25V radial
C5,C17,C20 = 10µF 25V radial
C6 = 1µF 16V radial
C7-C16,C19,C21-C29 = 100nF
C18 = 10nF
Inductors:
L1 = 100µH
Semiconductors:
B1 = B40C1500 bridge rectifier (40V piv, 1500mA continuous)
D1-D18 = LED, red, 3mm, low current
D2-D17,D19,D23 = LED, green, 3mm, low current
D20,D21,D22,D24-D32 = 1N4148
IC1 = 7815
IC2 = 7915
IC3 = LM317LZ
IC5,IC7,IC9,IC11,IC13,IC15,IC17,IC19,IC20 = TL082
IC4,IC6,IC8,IC10,IC12,IC14,IC16,IC18 = 4053
IC21 = 4013
IC22 = 555
IC23,IC24 = CNY17-4
Miscellaneous:
S1-S10 = pushbutton, one make contact, e.g., D6-R (ITT Schadow)
F1 = fuse 50mAT (time lag) with PCB mount holder
TR1 = mains transformer, PCB mount, 2x15V/10VA, e.g., ERA type EL48/16,8
K1 = 2-way PCB terminal block, lead pitch 7.5 mm
K2 = 9-way sub-D socket (female), PCB mount, angled pins
K3 = 9-way sub-D socket (male), PCB mount, angled pins
K4 = 8-way SIL pinheader
K5 = stereo 6.35 mm jack socket, PCB mount
K6 = 6-way SIL pinheader
Enclosure: e.g. Teko 52 39 84-60 (310 x 170 mm)
PCB, order code 000162-1
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