About the article

8-Channel Disco Light Control-ler

up to 500 watts per channel

8-Channel Disco Light Control-ler
The unit is designed as a stand alone disco lighting controller but can be used for driving eight sets of Christmas tree lights, shop display lights etc. It is sound activated and self-running. The effects are blackout, flood, VU meter, streak and pattern sequence. The only controls needed are three pushbuttons. It’s based around the popular 87C750 OTP device from Philips and was designed with a DJ or small band with a need to drive eight 500-watt PAR-56 lighting cans with a minimum of fuss.Main features– Effects: Flood, Blackout, Pattern Sequence, Beat Detect, VU Meter, Fast Chase on Beat Detect– Microprocessor controlled– Beat detector with built-in microphone and adjustable sensitivity– Controls 8 stage lights of up to 500 watts each– Electrical isolation between lamp drivers and microcontroller circuit– Single-board construction– Three-button control
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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 = 2k?2
R2 = 1k?
R3 = 10M?
R4,R5 = 10k?
R6 = 8k?2
R7-R30 = 560?
P1 = 10k? preset
C1 = 1000µF 25V radial
C2,C4,C10 = 100nF
C6,C7,C9 = 100nF, 7.5mm lead pitch
C3 = 100µF 16V radial
C5, C8 = 10µF 16V radial
C11,C12 = 22pF ceramic
D1-D4 = 1N4001
D5 = BAT43 or BAT85 (Schottky)
IC1 = CA3140, CA3130
IC2 = 87C750 or 87C751,
programmed, order code 010131-41
IC3,IC4 = LM2902
IC5-IC12 = MOC3042
IC13 = 7805
T1 = BC547
K1-K10 = 2-way PCB terminal block, lead pitch 7.5mm
MIC1 = electret capsule
S1,S2,S3 = pushbutton, 1 make contact
TRI1-TRI8 = BTA08-600C (BCR6 AM 8)
X1 = 4MHz quartz crystal
PCB, order code 010131-1
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