Hi Cr0sh, Destined,I just wanted to point out to avoid confusion that while I have been asking questions in this thread, I am not the original poster. I trust this is not a problem for anyone as the questions are relevant and also relate to a radio controlled car.
Just to clarify why I am looking for an input buffer, my receiver operates on around 6v, at present I have this connected to an Arduino interrupt through a 1K resistor. It works very well, noise from the FETs and Motor is not a problem however I am concerned about putting 6V into an Arduino Pin. I did try a quick and dirty work around with a series diode to drop some of the voltage but would like a cleaner long term solution.
In looking through the 7400 Series ICs, I see many buffers, some that have protection in the form of built in voltage clamping diodes, but they all seem to be designed to buffer demanding outputs rather than buffer/protect inputs, is this because the opto-isolator is the preferred solution in this application ?