8-Channel DMX Demultiplexer

eight DMX channels = 8 x 0-10 V

‘DMX512’ stands for ‘Digital Multiplex’, which is a technique that allows up to 512 channels to be driven sequentially (multiplexed) using a single cable. The circuit presented here is intended to be used to control DMX512-compatible devices.The DMX512 system was defined in 1986 by the USITT (the US organisation responsible for the development and distribution of standards for the theatre world), but it did not really take off until the mid 1990s, after the use of automatic spotlights became popular.Several articles devoted to the DMX512 system have already appeared in earlier issues of Elektor Electronics. The first one appeared in the first quarter of this year. If you want to know more about the technical details of the DMX512 standard, we recommend that you read this article [1], as well as the one on the MICI–DMX interface [2].

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Materials

010002-PCB.pdf

010002-11.zip

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.

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PCB

Download Gerber file: 010002-1.zip

Download Gerber file: 010002-2.zip

Component list

Resistors:
R1 = 220kOhm
R2, R4 = 220Ohm
R3 = 1kOhm
R5 = 390Ohm
R6, R7 = 4kOhm 7
Capacitors:
C1 = 1µ F 10V radial
C2,C3 = 33pF
C4-C7, C9,C10,C11 = 47nF
C8,C13,C14,C15,C17 = 100nF
C12,C16 = 1000µ F 25V radial
Semiconductors:
B1, B2 = B80C250 bridge rectifier (80V piv, 250mA cont.)
D1 = LED
D2 = zener diode 10V 500mW
IC1 = P80C32SFPN (40-pin DIL case, temperature range = 0-70°)
IC2 = 74F573 or 74HCT573
IC3 = 27C256 (programmed, order code 010002-21)
IC4 = DAC8800FP(Analog Devices)
IC5, IC6 = TL084
IC7 = LTC490 CN8 (Linear Technology)
IC8 = 6N137
IC9 = 7815
IC10 = 7805
IC11 = 79L05
IC12 = NMF0505S or TMA0505S
Miscellaneous:
K1, K2 = 8-way SIL pinheader
L1 = choke, 1µ H5*
S1 = 8-way DIP switch
X1 = 24MHz quartz crystal
Mains transformer, secondary 2x15V at 3VA
IEC mains appliance socket with earth connection and internal fuse, 25mA
Enclosure, size 200x80x132mm, e.g., Telet type LC270
PCB, order code 010002-1
Disk, project software, order code 010002-11