Is hard to get a 15V PSU??
I'm getting more trouble to get a VISHAY 2N7000KL than a 15V adapter.
I will do some tests but i don't have a lot of options here, i can't have access to a empty card to play with. Also I'm working blind because i don't understand the details about SC.
How much trouble this can cause?
The original design was using the I/O line to power a led, at least 20ma was "stolen" from that line. Using the switch will draw much less than that, why not increase the R10 to about 120K?
I was reading some info about the RS232 interface from this site:
The standard voltage range on RS-232 pins is _15V to +15V. This voltage range applies to all RS-232 signal pins. The total voltage swing during signal transmission can be as large as 30V. In many cases, RS-232 ports will operate with voltages as low as _5V to +5V. This wide range of voltages allows for better compatibility between different types of equipment and allows greater noise margin to avoid interference.
I think you have access to many type of cards than I, if you could build the interface for yourself it could be easy to debug this erros, if any.
Thanks but is your hacks
Many of the people that have build this interface are cellphone repair man, they use the interface to dump the phone book (so they say). Others to program ID cards.
So far, i did not receive any complain by this people, that makes me think what is wrong with the one that bobzombie have build.
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