8 Channel D/O Card for RS232
Materials
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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Component list
R1,R2,R3 = 2k?2
R4,R5,R6 = 10k?
R7-R14 = 1k?
Capacitors:
C1,C2,C3 = 100nF
C4 = 330nF
Semiconductors:
D1,D2,D3 = 1N4148
D4-D11 = LED, high efficiency
D12 = 1N4001
IC1 = 4040
IC2 = 74HC573
IC3 = 74HC541
IC4 = ULN2803
IC5 = 7805
IC6,IC7,IC8 = 4N28 or CNY17-2
Miscellaneous:
K1 = 25-way sub-D socket (female), PCB mount
12 solder pins
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