USB-RS232 Interface
A compact solution for missing ports
Materials
Gerber file
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Extra info / Update
Component list
Resistors:
R1,R3,R10 = 100k?
R2 = 470k?
R4,R5 = 10?
R6 = 1k?5
R7,R8 = 1k?
R9 = 10k?
R11 = 470?
R12 = 2k?2
Capacitors:
C1,C3 = 10nF
C2 = 33nF
C4,C5,C6,C8-C13 = 100nF
C7,C14 = 10µF 16V radial
Inductors:
L1 = BLM31A601S (Murata) (e.g., Farnell # 581-094)
Semiconductors:
D1,D2 = LED, 3mm dia.
T1 = BC857
IC1 = FT232AM or FT232BM (FTDI Chip order code FT8U232AM)
IC2 = 93C46 (optional)
IC3 = MAX213ECWI
Miscellaneous:
K1 = 9-way sub-D plug (male), PCB mount, angled pins
K2 = USB connector, type B, PCB mount
X1 = 6MHz ceramic resonator
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