ICOM CI-V interface to RS232 using transistors, fits in DB9 case

pro: No external power needed.
pro: Very small, fits in DB9 connector case (with SMD components)
con: Requires standard compliant serial port, may not work on all notebooks.

Alexander from Russia writes:
Concernig scematic for CI-V adapter. I drew down it from real pcb so I specified part value for readable components only. They all are smd.
C1 - ceramic (looks strange but it's true),
R5 - at least 0.5W
Q1 and Q2 I guess can be any switch transistors.
I checked this adapter with CI-V Explorer software, everything's ok.

Last modified: 17. Dec 1999, DF4OR