I've found better info: TTL to RS232 adaptor Explained – uCHobby
With two optocuplers? You mean only with two OC and nothing else? I can easily get EL817.
I've found better info: TTL to RS232 adaptor Explained – uCHobby
With two optocuplers? You mean only with two OC and nothing else? I can easily get EL817.