I have no idea on how to calculate what would be the best transistor to use for the Prop Plug. And I don't know where to start to learn. The datasheet does not give a value for the transistor. And all of parallax's products that use a "FT232RQ" USB to UART chip does not give a value for the transistor.
So I was wondering, Does anyone know what the value of the transistor should be?
And also, how can I learn to be able to design a transistor circuit? Like what current rating would I need, what supporting components would I need, etc...