Usb - Rs232
The problem is I want to build an USB - TTL data cable, optical isolated with the circuitry shown.
I have a schematics, I don't know if it works.
If it is as you say with USB adaptor, could I use a GSM data cable to adpt it to the optocouplers? I saw that the power in these cables is 3.3V, and I need 5V.If I can increase power to 5V, can I connect the optocoupler to the out of the GSM data cable? In my opinion, the GSM data cable creates a virtual COM port, is powered 3.3V, has the necessary drivers. The only problem are 3.3V->5V and the connection between the 2 circuitry, if is correct.
Thanks